Browser Kitty
JA
Updates

What's new

New tools and notable improvements to Browser Kitty.

Updated five tools: Pause & Tell, Music Cue Pad, DuckDB Explorer, Lossless Video Cutter, and PPTX Version Control

Pause & Tell v1.0.1 fixes drawing history and save messages and adds a video file picker on phones. Music Cue Pad v1.0.3 improves playback controls, backup/restore safety, and mobile layout. DuckDB Explorer v1.0.5 prevents stale analysis results when changing databases and improves read-only SQL checks. Lossless Video Cutter v1.0.6 fixes missing video/audio near cut boundaries and retains multiple audio and compatible subtitle tracks. PPTX Version Control v1.1.8 upgrades slide rendering for visual comparison and blocks external media loads.

Pause & Tell Music Cue Pad DuckDB Explorer Lossless Video Cutter PPTX Version Control

Five tool releases: Video Speed Changer, Arrow Viewer, SQLite Explorer, Same Spot Diff, Video Review Notes

Video Speed Changer v1.1.2 prevents stale conversion results and improves video loading and switching. Arrow Viewer v1.0.3 fixes duplicate field names, dictionaries and timestamps. SQLite Explorer v1.1.3 improves database replacement, CSV exports and large integer handling, and adds a WAL-mode warning. Same Spot Diff v1.0.7 fixes self-extracting startup, camera handling, pinch gestures and ignored-region boundaries. Video Review Notes v1.0.5 improves portrait video annotations, autosaving and file selection on phones.

Video Speed Changer Arrow Viewer SQLite Explorer Same Spot Diff Video Review Notes

Updated Device Check and Smart Image Sorter

Device Check v1.0.6 improves how camera, microphone, speaker and other test results are verified, and fixes interrupted sessions, page restoration and mobile display. Smart Image Sorter v1.0.6 prevents stale results after cancelled sorting and improves autosave, recovery, cross-tab conflict detection and memory use during ZIP creation.

Device Check Smart Image Sorter

Updated four tools: Parquet Viewer, File in Image, Practice Mirror, and Photo Privacy Inspector

Parquet Viewer v1.0.0 adds multi-file tabs, metadata inspection, and find, sort, and CSV export for the current preview page. File in Image v1.0.4 improves PNG recovery, error handling, and mobile layout. Practice Mirror v1.1.1 fixes Android video display and Review exports. Photo Privacy Inspector v1.1.0 improves metadata inspection and cleaning, and adds HEIC-to-JPEG conversion with re-inspection on supported browsers (HDR and auxiliary images are not preserved).

Parquet Viewer File in Image Practice Mirror Photo Privacy Inspector

Added a guide to automatically sorting photos into categories with local AI

Added a Smart Image Sorter guide to classifying up to 500 images by content, reviewing uncertain matches, and saving the originals in a category ZIP. It also covers predefined categories and how to resume a session.

Read the AI photo sorting guide Smart Image Sorter

Added a guide to combining a saved web page into one HTML file

Added a guide to checking and packaging a saved HTML page with its local images and CSS. It explains that the tool does not download external URLs or convert runtime file loading, and why offline behavior and generated HTML safety still need checking.

Read the single-HTML guide Offline Web Packager

Added a guide to counting characters and checking writing length

Added a Text Inspector guide to comparing character counts with and without whitespace and tracking limits such as 400 or 800 characters. It also covers selected text, repeated words, long sentences, invisible characters, TXT export, and local autosave.

Read the character-counting guide Text Inspector

Improved Office Image Extractor results and SVG previews (v1.1.1)

The file drop area now becomes compact after import, and image selection and ZIP download are grouped together. Supported SVG images can be previewed as thumbnails or enlarged; other SVGs remain downloadable as originals.

Open Office Image Extractor

Added a guide to creating an offline survey form and exporting CSV

Added a guide to building a standalone HTML survey form, saving answers locally and exporting CSV. It explains JSON backups, browser storage limits and why responses from separate devices are not automatically combined.

Read the offline form guide Local Form Builder

Added a guide to choosing the best shots from burst photos

Added a guide to reviewing burst or similar photos in groups, comparing shots in A/B views at 100%, 200%, or 400% zoom, and saving selected originals in ZIP files. It covers smaller ZIPs, HEIC support limitations, and retained EXIF/GPS metadata.

Read the best-shot selection guide Best Shot Picker

Added a guide to splitting a roster into balanced random teams

Added steps for pasting a roster, setting a team count or target size, and randomly splitting participants into groups whose sizes differ by at most one. The guide also covers duplicate names, candidate-sharing links, and local storage.

Read the random team-splitting guide Random Picker

Added a guide to keeping a Pomodoro timer visible in a floating window

Added a guide to running a 25-minute focus timer in Document or Video Picture-in-Picture, with duration presets, Flow overtime, distraction tracking, CSV/JSON exports, and browser limitations.

Read the floating Pomodoro timer guide Pomodoro Timer

Added a guide to making round-robin fixtures and league standings

Added steps for building round-robin fixtures for 3–64 participants, recording results, applying standings rules, exporting CSV or PNG, printing, and saving JSON backups. The guide explains the round-robin-only scope.

Read the round-robin guide Mini League Desk

Added a guide to previewing Markdown and comparing publishing styles

Added a guide to comparing GitHub-, Qiita- and Zenn-inspired Markdown previews, reviewing compatibility warnings, and saving .md files, including limits of approximations, remote images and autosave.

Read the Markdown preview guide Markdown Preview Lab

Added a guide to reviewing PDFs without changing the original

Added a guide to anchoring review comments to PDF text and figures, tracking status, and exporting HTML, CSV or Markdown while keeping the original PDF unchanged.

Read the PDF review guide PDF Review Notes

Added a guide to making pixel-art animations and exporting GIF or sprite sheets

Added a guide to drawing pixel art frame by frame, adjusting animation timing, and exporting animated GIF or sprite-sheet PNG, including project backups, PNG import, and GIF color/transparency limits.

Read the pixel art animation guide Pixel Animation Studio

Added a guide to making a handwriting font and exporting TTF

Added a guide to drawing characters in the browser, checking generated TrueType glyphs and exporting TTF, with editable project backups and the 180-character limit.

Read the handwriting font guide Handwriting Font Maker

Added a guide to reversing video and audio into MP4

Added a guide to making reversed and forward-and-back MP4 clips from short video sections, including optional reversed audio and clear limits for frame rate, duration, quality and browsers.

Read the video reversing guide Reverse Clip

Added a guide to making video contact sheets

Added a guide to extracting 12, 24 or 48 evenly spaced video frames into a timestamped PNG/JPEG contact sheet, including CSV timestamps, frame-count choices and sampling limitations.

Read the video contact sheet guide Video Contact Sheet

Added a guide to converting MP3 and WAV audio to MIDI

Added a guide for converting short MP3/WAV recordings into editable MIDI notes locally, reviewing and correcting detected pitches, and exporting MIDI or CSV with accurate limitations.

Read the MP3-to-MIDI guide Audio to MIDI

Added Best Shot Picker for comparing and selecting photos

Added Best Shot Picker to review burst or similar photos in A/B, pick favorites manually, and save untouched originals in standard or smaller ZIPs. Group editing, zoom and optional selection lists are supported; EXIF/GPS metadata remains.

Best Shot Picker

Added a guide to converting TTF/OTF to subsetted WOFF2

Added a Font Subsetter guide for building character-limited WOFF2 fonts from TTF/OTF, reviewing Japanese glyph coverage and licensing, and using the generated CSS and ZIP assets.

Read the guide Font Subsetter

Added a guide to converting JSON to CSV

Added a guide to turning JSON arrays into CSV using JSON / YAML / CSV Viewer, including table-compatible structures, nested fields, blanks, UTF-8 export and Excel import pitfalls.

Read the guide JSON / YAML / CSV Viewer

Added Audio to MIDI

Added Audio to MIDI for local note estimation from short audio, piano-roll corrections, original/synthesized playback comparisons, and MIDI or CSV export.

Audio to MIDI

Added Pause & Tell

Added Pause & Tell to insert narrated or silent drawing explanations at paused frames while preserving the source video, with standard WebM and experimental short MP4 export.

Pause & Tell

Added Reverse Clip for reversed and ping-pong MP4s

Added Reverse Clip for reversing a selected video section or making a forward-and-back MP4, with optional reversed audio. Browser Kitty serves the multi-thread build; video processing stays on the device.

Reverse Clip

Added Time Study Desk for video-based work measurement

Added Time Study Desk for marking work-step boundaries in recorded video, comparing repeated cycle timings, reviewing source intervals, and exporting analysis-only JSON and CSV while distinguishing interruptions and unobserved time.

Time Study Desk

Added a guide to removing a section from an MP3

Added a guide to splitting an MP3 around an unwanted section, removing it, previewing the join and exporting the result, including re-encoding and mobile considerations.

Read the guide Audio Cutter & Joiner

Added Tuning Compare and a tuning-comparison guide

Added Tuning Compare for equal temperament, 5-limit just intonation and custom tuning, plus a guide to listening to major thirds and chords, inspecting Hz/cents and exporting WAV.

Read the guide Tuning Compare

Added a guide to removing all PowerPoint speaker notes

Added a guide to removing PowerPoint speaker notes with Document Inspector or Office Privacy Inspector, including backups, cleanup choices, reinspection, and unsupported files.

Read the guide Office Privacy Inspector

Added Passage Counter

Added Passage Counter for counting A→B and B→A line crossings from a fixed camera or local video, with setup checks, manual corrections/undo and event, summary and time-bucket CSV exports.

Passage Counter

Added a guide to reducing noise in voice recordings

Added a guide to reducing noise in MP3, M4A, WAV and other voice recordings with Voice Cleaner, including a 10-second preview, before/after comparison, WAV export and local-processing limitations.

Read the guide Voice Cleaner

Added Web Serial Terminal

Added Web Serial Terminal for Text/HEX serial communication, port settings, local command macros and TXT/JSONL exports. It primarily targets desktop Chrome and Edge and does not upload serial data.

Web Serial Terminal

Added a guide to combining two photos into one image

Added a guide to arranging two photos side by side or vertically, adjusting crop and spacing, and exporting JPEG, PNG or WebP on a phone. It also explains Google Photos alternatives, HEIC limitations and local processing.

Read the guide Photo Collage

Added Reveal Sheet

Added Reveal Sheet for covering answers in diagrams, photos, and notes, then studying by free reveal or guided questions. Export editable JSON or a self-contained HTML lesson; imported study material is processed on the device.

Reveal Sheet

Added a guide to finding differences between two photos

Added a Same Spot Diff guide covering automatic alignment of Before/After photos, highlighted changes, navigating detected regions, slider and blink views, ignored areas, a camera guide, PNG export and detection limits.

Read the guide Same Spot Diff

Added Voice Cleaner

Added Voice Cleaner to reduce background noise around recorded speech in the browser. Import audio/video or record from a microphone, preview a 10-second section, compare original and cleaned audio, and save 16 kHz mono WAV after processing the full recording. Recordings are not uploaded for conversion.

Voice Cleaner

Added a guide to converting Word DOCX to Markdown

Added a Word DOCX-to-Markdown guide covering headings, tables, image ZIPs versus Base64 embedding, batch conversion, unsupported legacy .doc and encrypted files, and local browser processing.

Read the guide Document to Markdown

Added Practice Mirror

Added Practice Mirror to show your camera feed 1–30 seconds late for dance or sports practice. Review up to 180 seconds of recent video with slow playback, frame stepping and guides, then save a silent WebM clip locally. Camera data stays in the browser.

Practice Mirror

Added a guide to converting PowerPoint to narrated MP4

Added a guide to converting PPTX into a narrated MP4 with Presentation Video Maker using speaker notes as scripts, slide-by-slide audio, subtitles, BGM and 720p/1080p export. It compares PowerPoint's built-in export and explains smartphone TTS capture limits, .pvm projects and animation restrictions.

Read the guide Presentation Video Maker

Added Photo Collage

Added Photo Collage for combining 2–20 JPEG, PNG, or WebP photos into one image using aspect-ratio-aware layout suggestions. Reorder and crop photos, adjust zoom, canvas ratio, spacing, background and corners, then export JPEG, PNG or supported WebP—all locally in the browser.

Photo Collage

Added a guide to creating animated GIFs from multiple images

Added a Frame Animator guide to combining PNG, JPG, and still WebP images into animated GIF or WebP files. It covers frame order and timing, canvas placement and size, forward/reverse/ping-pong playback, loops, file size adjustments, playback troubleshooting, supported inputs, and local browser processing.

Read the guide Frame Animator

Added NFC Tap Log

Added NFC Tap Log for opening cleaning, replacement, and inspection histories from NFC tags or QR codes, checking elapsed time, and logging completed work. Compatible Android browsers can write and verify NFC tags; CSV export and JSON backup are available. Records remain local to each browser and do not sync across devices.

NFC Tap Log

Added a guide to scanning paper documents to PDF on a phone

Added a guide to scanning paper documents into PDF on a phone with Submission PDF Scanner. It covers correcting page corners and perspective, combining pages, A4 and black-and-white settings, 1 MB/2 MB size targets, final checks, and built-in iPhone/Android alternatives.

Read the guide Submission PDF Scanner

Added Frame Animator

Added Frame Animator for creating animated GIF and WebP from JPEG, PNG, and still WebP images. Set per-frame durations, forward/reverse/ping-pong playback, loops, canvas size, and quality while processing images locally.

Frame Animator

Added a guide to printing and calling queue numbers

Added a Queue Board guide covering A4 ticket printing, issuing and calling numbers, handling no-shows, waiting-room display, CSV history, and the limits of same-browser display synchronization.

Read the guide Queue Board

Added Document to Markdown

Added Document to Markdown for converting DOCX, PPTX, XLSX, PDF, TXT, HTML, CSV, and TSV locally, including tables, headings, PowerPoint speaker notes, embedded images, conversion reporting, and batch processing.

Document to Markdown

Added a guide to using a phone as an auto-scrolling cue card

Added a guide to using Pocket Teleprompter as an auto-scrolling phone cue card, covering speed and target duration, text size, eye-line guide, mirroring, mid-script rehearsal, and the limitation that it does not overlay another camera app on the same phone.

Read the guide Pocket Teleprompter

Added Mini League Desk

Added Mini League Desk for running 3–64 participant round-robin events in the browser, including fixtures and matrix views, win/draw/score entry, remaining matches, standings, local autosave, CSV/PNG/print output, and JSON backup.

Mini League Desk

Added a guide to merging MP3 and WAV audio files

Added a practical guide to merging MP3, WAV, and other audio files in the browser, covering trimming, splitting, reordering, boundary preview, MP3/WAV/M4A export, and re-encoding considerations.

Read the guide Audio Cutter & Joiner

Added Loan Board

Added Loan Board for short-term equipment lending, with multi-item checkout, full or partial returns, outstanding-item tracking, history, local autosave, JSON backup/restore, and CSV exports on one device.

Loan Board

Added a guide to using a phone as a spirit level

Added a guide to using Pocket Level as a browser-based spirit level and inclinometer, including level/plumb checks, slope percentage, zeroing, Hold, two-second averaging, 180-degree calibration, permissions, and accuracy limits.

Read the guide Pocket Level

Added Queue Board

Added Queue Board for issuing numbers and managing a queue at one to four counters. Includes a same-browser display window, recall and absent handling, local session autosave, history CSV, and A4 / Letter ticket printing. Remote-device synchronization and SMS notifications are not included.

Queue Board

Added a guide to opening and inspecting ORC files

Added a guide to inspecting ORC row counts, compression, schema, and column statistics before reviewing records with Table / Record and cell details. It also explains current-page sorting and CSV export, compression support, and large-file limitations.

Read the guide ORC Viewer

Updated descriptions and search for five tool improvements

Updated Japanese and English descriptions and search for Clean Text in Data Pipeline Builder, overlay duplication in PDF Fill & Sign, odd/even/last page expressions in PDF Pipeline Builder, spreadsheet copying in Graph Digitizer, and invisible-character checks in Text Inspector. Each tool page explains how to use the improvement and its supported scope.

Data Pipeline Builder PDF Fill & Sign PDF Pipeline Builder Graph Digitizer Text Inspector

Added File in Image

Added File in Image for embedding one arbitrary file into PNG, JPEG, or WebP image pixels and recovering it later from the generated PNG. It supports payloads up to 32 MiB, optional password protection, adaptive embedding, SHA-256 recovery verification before saving, and browser-local processing.

File in Image

Added a guide to extracting audio from video

Added a guide to choosing an audio track from MP4 and other video files, saving supported audio without re-encoding, or converting it to MP3 / M4A / WAV. It also covers multi-audio files, large inputs, browser-local processing, and the standalone HTML build.

Read the guide Video Audio Extractor

Added Video Audio Extractor

Added Video Audio Extractor for choosing one audio track from a video, saving supported audio without re-encoding, or converting it locally to M4A, MP3, or WAV. It supports multi-audio track selection, result preview, desktop / smartphone layouts, and Japanese / English.

Video Audio Extractor

Added a guide to merging PDFs and adding continuous page numbers

Added a guide to building one PDF Pipeline Builder workflow for merging PDFs, cleaning up pages, separating the cover from the body, numbering only the body, merging the branches again, applying a watermark, previewing intermediate results, and reusing the workflow as a Recipe.

Read the guide PDF Pipeline Builder

Added Offline Web Packager

Added Offline Web Packager for analyzing saved HTML, ZIP archives, or web-page folders in the browser and packaging supported static pages with their local resources into one HTML file. It checks missing files, external dependencies, unsupported v1 structures, and reinspects generated output for unresolved references.

Offline Web Packager

Added a guide to inspecting and removing Office metadata

Added a guide to checking author metadata, comments, speaker notes, hidden information, and other privacy-related findings in Word, Excel, and PowerPoint files before sharing, then cleaning supported metadata and reinspecting the result.

Read the guide Office Privacy Inspector

Added Office Privacy Inspector

Added Office Privacy Inspector for reviewing author metadata, comments, tracked changes, hidden sheets or slides, speaker notes, external references, and other privacy-related findings in DOCX, XLSX, and PPTX before sharing. Supported findings can be removed from a separate copy and automatically reinspected, while packages that are risky to rewrite remain inspection-only.

Office Privacy Inspector

Added a guide to converting JPG and PNG images to PDF

Added a guide to loading JPG, PNG, and WebP images in PDF Organizer, reordering pages, choosing Fit / Fill / Original Size, and combining multiple images into one PDF. It also covers mixing images with existing PDFs and why PDF conversion does not necessarily reduce file size.

Read the guide

Added Music Cue Pad

Added Music Cue Pad for registering multiple audio files, triggering them from large buttons, and configuring Start / End, volume, fades, Loop, and trigger shortcuts per cue. Boards can stay in local browser storage, move as .bkcue backups, or be exported as self-contained playback-only HTML.

Music Cue Pad

Added a guide to filling and hand-signing PDFs locally

Added a guide to filling supported PDF form fields, placing text, dates, marks, handwritten signatures, initials, and stamp images, reviewing flattening behavior, and saving the completed PDF locally. It also explains the difference between visual and certificate-based digital signatures.

Read the guide

Added Font Subsetter

Added Font Subsetter for collecting characters actually used by a web project and creating smaller WOFF2 subsets from TTF / OTF. It includes cmap coverage checks, fsType review, multi-font processing, Variable Font preservation, @font-face / unicode-range generation, and webfont ZIP export.

Font Subsetter

Added a guide to fitting video to a target duration with speed changes

Added a guide to calculating the multiplier needed to fit a target video duration, reviewing 0.25×–4.00× speed, audio and quality settings, and exporting a new MP4 locally.

Read the guide

Added Interactive Guide Maker

Added Interactive Guide Maker for building structured guides with text, images, steps, callouts, checklists, tabs, and code, exporting them as searchable self-contained HTML, and reopening the same HTML for later editing.

Interactive Guide Maker

Added a guide to digitizing graph images and PDFs into CSV

Added a practical guide to calibrating graph images or PDF pages, digitizing XY data manually or with curve/marker detection, reviewing overlays and redrawn results, and exporting CSV.

Read the guide

Added Graph Digitizer

Added Graph Digitizer for calibrating axes on graph images or PDF pages, extracting XY data manually or from colored curves and plot markers, reviewing and repairing the result, and exporting CSV. Projects can be saved as .graphdigitizer.json.

Graph Digitizer

Added a guide to detecting and redacting faces in video

Added a practical guide to detecting faces locally in video, reviewing masks frame by frame, correcting misses with re-detection or manual masks, applying pixelation / blur / fill / emoji, and exporting H.264 MP4.

Read the guide

Added Pixel Animation Studio

Added Pixel Animation Studio for drawing frame-by-frame pixel art on canvases up to 128×128, previewing motion with onion skinning and frame timing, and exporting PNG, animated GIF, or sprite-sheet PNG files.

Pixel Animation Studio

Added a guide to finding invalid lines in JSONL / NDJSON files

Added a practical guide to scanning JSONL / NDJSON line by line, finding malformed or blank lines, checking top-level field presence and mixed types such as number / string / null, and exporting the current page as JSONL or CSV.

Read the guide

Added PDF Fill & Sign

Added PDF Fill & Sign for completing AcroForm fields, placing text, dates, ✓ / × / ○ marks, handwritten signatures, initials, and PNG / JPEG / WebP images, then saving a new completed PDF locally without overwriting the source.

PDF Fill & Sign

Added a guide to opening DBF files and fixing garbled text

Added a practical guide to inspecting DBF fields and records, troubleshooting Shift_JIS / Windows-31J mojibake, reading DBT/FPT memo data, checking deleted records, and exporting the visible page as UTF-8 CSV.

Read the guide

Added Local Form Builder

Added Local Form Builder for creating inspection, reception, survey, and checklist forms in the browser, then exporting standalone HTML files with validation, local response history, CSV / JSON tools, and printing.

Local Form Builder

Added a guide to making and printing planner refills at actual size

Added a practical guide to creating A5, Bible, Mini 6, Micro5, and other planner refills with ring-side margins, holidays, A4 imposition, duplex settings, and Actual size / 100% printing.

Read the guide

Added Planner Refill Maker

Added Planner Refill Maker for creating exact-size monthly, yearly, weekly, daily, and note refills for A5, Bible, Mini 6, Micro5, and other sizes, with ring-side margins, Japanese holidays, duplex output, and A4 / Letter imposition.

Planner Refill Maker

Added a guide to batch-adding text watermarks to images

Added a practical guide to applying the same text watermark across JPEG, PNG, and WebP images with Image Pipeline Builder, combining resize or format conversion in one Pipeline and reusing it with previews, ZIP export, and Recipes.

Read the guide

Added Image Pipeline Builder

Added Image Pipeline Builder for connecting resize, crop, adjustment, blur, watermark, and other image operations as nodes, then applying the same workflow across JPEG, PNG, and WebP batches with intermediate previews, branching outputs, Recipes, Pipeline JSON, and ZIP export.

Image Pipeline Builder

Added a guide to creating a Wi-Fi QR code and sharing the password

Added a practical guide to creating a Wi-Fi connection QR code from an SSID, password, and security type, then sharing it on screen, as PNG, in print, or through separate copied details, with credential-safety notes.

Read the guide

Added Video Review Notes

Added Video Review Notes for time-based point/range feedback, frame annotations, Open / Resolved tracking, and standalone HTML, Markdown, CSV, or JSON export.

Video Review Notes

Added a guide to creating and printing label sheets at actual size

Added a practical guide to defining label sheets at real dimensions, designing labels with text, images, QR and barcodes, merging CSV / TSV data, reusing partially used sheets, calibrating X/Y alignment, and printing the final PDF at Actual size / 100%.

Read the guide

Added Label Sheet Maker

Added Label Sheet Maker for defining physical label-sheet geometry, placing text, images, QR and barcodes, merging CSV / TSV data, reusing partially used sheets, calibrating X/Y print position, and exporting print-ready PDFs. Projects can be saved as .labelsheet.json files for later restoration.

Label Sheet Maker

Added a guide to tiling large PDFs and images across A4 sheets

Added a practical guide to tiling PDFs, images, and SVGs across A4 or other ordinary paper with explicit finished size, printer margins, overlap, effective PPI, trim and registration marks, 100% printing, and 100 mm calibration.

Read the guide

Added Large Print Tiler

Added Large Print Tiler for splitting PDFs, images, and SVGs across A4, A3, or Letter sheets while keeping finished physical size, overlap, trim lines, and registration marks explicit. It also supports independent X/Y printer scaling correction with a 100 mm calibration PDF.

Large Print Tiler

Added an article on browser FFmpeg threading

Added an article explaining single-thread and multi-thread FFmpeg WebAssembly through Web Workers, SharedArrayBuffer, cross-origin isolation, COOP / COEP, delivery constraints, and performance/memory trade-offs.

Read the article

Added FFmpeg Filter Builder

Added FFmpeg Filter Builder for composing Video / Audio / Text FFmpeg filter graphs as editable nodes, checking short previews, and rendering the full MP4. Browser Kitty serves the SharedArrayBuffer-based multi-thread build with route-specific cross-origin isolation headers.

FFmpeg Filter Builder

Added Data Pipeline Builder

Added Data Pipeline Builder for composing CSV / TSV / JSONL / Parquet transforms, joins, unions, and Group By operations as a node workflow, previewing intermediate results, and reusing the process as a Recipe with other files.

Data Pipeline Builder

Added a guide to reusable multi-step PDF processing

Added a practical guide to composing page operations, branching, merging, and document finishing as a node pipeline, previewing intermediate results, and reusing the workflow as a Recipe or Pipeline JSON.

Read the guide

Added English portal pages

Added statically generated English portal pages under /en/ for the home page, tool catalog and details, guides, About, and other portal content while keeping the shared /apps/ tool files unchanged. Japanese and English pages are linked with canonical and hreflang metadata.

Open English site

Added PDF Pipeline Builder

Added PDF Pipeline Builder for composing page operations, branching, merging, page numbers, Watermark, and Text Stamp as a node workflow, previewing intermediate results, and reusing saved Recipes with other PDFs.

PDF Pipeline Builder

Added a guide to comparing two PowerPoint files

Added a practical guide to comparing an original and revised PowerPoint deck through slide matching, Semantic Diff, and side-by-side, overlay, split, and blink visual review.

Read the guide

Added PPTX Version Control

Added PPTX Version Control for keeping PowerPoint version history locally with Semantic Diff, visual comparison, branches, 3-way merge, conflict resolution, and .pptxvc project backups in the browser.

PPTX Version Control

Added a guide to file:// versus localhost

Added a guide explaining why identical HTML can behave differently under file:// and localhost, covering origins, CORS, JavaScript modules, secure contexts, service workers, localStorage, and range requests.

Read the guide

Added PDF Review Notes

Added PDF Review Notes for attaching feedback to PDF text or regions, tracking open/resolved items, and exporting Markdown, CSV, or standalone HTML reports. PDFs and review content are processed on the device.

PDF Review Notes

Added a guide to why PowerPoint diffing is not simple

Added a guide based on lessons from building PPTX Diff, explaining why PowerPoint comparison is harder than line-based text diffing through Open XML package structure, slide matching, semantic diffing, visual comparison, and uncertain cases.

Read the guide

Added PPTX Diff

Added PPTX Diff for comparing two PowerPoint (PPTX) files locally, including semantic changes in text, numbers, images, layout, formatting, and speaker notes plus high-fidelity visual comparison. Results can be saved as an HTML report.

PPTX Diff

Added a guide to browser capability differences in fully local tools

Added a guide explaining why fully local web tools can still expose different capabilities across browsers, operating systems, and devices, covering Web APIs, secure contexts, permissions, hardware, fallbacks, and Browser Kitty examples.

Read the guide

Added Pass-the-Phone Vote

Added Pass-the-Phone Vote for passing one phone around so people can vote without seeing earlier choices or interim results, then revealing only the final aggregate tally. Voter-to-choice history is not retained and voting data stays on the device.

Pass-the-Phone Vote

Added a guide to how Browser Kitty verifies fully local processing

Added a guide documenting how Browser Kitty verifies a fully local processing claim by checking data paths, runtime dependencies, CSP, real network behavior, and explicit save/share boundaries, with three implementation examples.

Read the guide

Added Presentation Video Maker

Added Presentation Video Maker for turning PowerPoint (PPTX) slides into narrated MP4 videos locally, with speaker notes, recordings or local audio, subtitles, BGM, resumable projects, and an accelerated WebCodecs export path when available.

Presentation Video Maker

Added a guide to seeds and reproducible randomness

Added a guide explaining why seeded pseudorandom generators can reproduce the same random-looking data, what conditions reproducibility depends on, and how test randomness differs from security randomness.

Read the guide

Added Test Data Generator

Added Test Data Generator for creating reproducible dummy datasets in the browser, with 23 data types, missing/boundary/invalid values, templates, large generation jobs, and CSV / TSV / JSON / JSONL export.

Test Data Generator

Added a guide comparing local and cloud AI

Added a guide comparing local and cloud AI by inference location, data flow, model size, latency, device load, offline use, and privacy considerations.

Read the guide

Added Wi-Fi Share

Added Wi-Fi Share for generating a Wi-Fi connection QR code from an SSID and password, copying or showing details, and creating an A4 print layout. Experimental NFC tag writing is also available on supported Android browsers.

Wi-Fi Share

Added a guide to what determines video file size

Added a guide explaining video file size through duration, average bitrate, resolution, frame rate, codec efficiency, content complexity, and audio rather than resolution alone.

Read the guide

Added Schema Diff

Added Schema Diff for comparing two Parquet, CSV, TSV, JSONL, or NDJSON files locally, including field additions/removals, type and nullability changes, structure, Field IDs, and compatibility guidance.

Schema Diff

Added a guide to the practical limits of large-file browser processing

Added a guide explaining how decoded data, memory, CPU work, temporary buffers, incremental reads, and device differences determine the practical limits of processing large files in a browser.

Read the guide

Improved tool search with intents, aliases, and synonyms

Updated the tool catalog search to rank titles, aliases, synonyms, natural-language intents, and light fuzzy matches in the browser. Search terms are not sent to an external AI service or analytics.

Find a tool

Added Video Speed Changer

Added Video Speed Changer for speeding up or slowing down a video from 0.25× to 4.00×, calculating speed from a target duration, choosing audio behavior, and saving the result as MP4.

Video Speed Changer

Added a guide comparing common data file formats

Added a guide comparing CSV, JSONL, Parquet, ORC, Arrow, and Avro by their roles in human-readable exchange, columnar analytics, in-memory interchange, and schema-aware records.

Read the guide

Added a guide to how browser-local processing works

Added a guide explaining how browsers can process images, video, and databases locally, covering file access, Canvas, WebCodecs, WebAssembly, DuckDB-Wasm, and the practical limits of device-side processing.

Read the guide

Added Handy Convert and Handwriting Font Maker

Added Handy Convert for everyday date, time, and Japanese text conversions, and Handwriting Font Maker for creating a TrueType font from handwriting drawn in the browser.

Handy Convert Handwriting Font Maker

Added a guide to browser storage and backups

Added a guide explaining where web-app settings, history, and working data can live in browser storage, when that data can disappear, what happens across devices, and how exported JSON or CSV backups fit in.

Read the guide

Added Audio Cutter & Joiner

Added Audio Cutter & Joiner for trimming, splitting, reordering, and previewing multiple audio clips before exporting MP3, WAV, or M4A/AAC where supported.

Audio Cutter & Joiner

Added a guide to inspecting DuckDB files

Added a guide to opening a DuckDB file in the browser and working through the overview, tables and views, column profiling, guarded read-only SQL, data-dictionary HTML, and structural comparison.

How to inspect a DuckDB file

Added DuckDB Explorer

Added DuckDB Explorer for opening local DuckDB files read-only and inspecting database overview, data, column profiles, guarded SQL, data-dictionary HTML, and structural database differences.

DuckDB Explorer

Added a guide to local processing and file uploads in web tools

Added a guide explaining what happens after choosing a file in a web tool, including browser-local processing, server uploads, hybrid designs, trade-offs, and practical checks before use.

Read the guide

Added Check-in Desk

Added Check-in Desk for reusing a roster across check-in and entry/exit sessions, with focused reception view, walk-ins, history, CSV import/export, and JSON backup on one device.

Check-in Desk

Added a guide to saving and using single-HTML tools

Added a guide explaining the benefits of single-HTML tools and the differences between one-file distribution, offline use, fully local processing, updates, and browser-stored data.

Read the guide

Added a guide to retaking photos with the same composition

Added a guide to retaking an older or Before photo from nearly the same composition using camera overlays, automatic alignment guidance, manual adjustment, and post-capture Before/After comparison.

Read the guide

Added Photo Re-Enactor and One Second Montage

Added Photo Re-Enactor for retaking a scene with a reference-photo overlay and Before/After comparison, plus One Second Montage for turning photos and videos into a one-second-per-item MP4 with optional music and capture-year dividers.

Photo Re-Enactor One Second Montage

Added a guide to using a phone as a presentation remote

Added a guide to opening PPTX/PDF on a computer, pairing a phone directly by QR on the same Wi-Fi, using Presenter View, speaker notes and pointer controls, and checking common connection issues.

Use a phone as a presentation remote

Added Presentation Remote

Added Presentation Remote for opening local PPTX/PDF files on a presenting computer and controlling them from a directly paired phone, with Presenter View, speaker notes, and pointer controls.

Presentation Remote

Added a guide to printing large text on A4

Added a guide to fitting short notices and signs as large as possible on A4, including line/character splitting, margins, orientation, and print-dialog limitations.

Print large text on A4

Added a contact form

Added a Google Forms contact form so users can send bug reports, feature requests, and usage questions without a GitHub account.

Contact

Added Max Text Print

Added Max Text Print for fitting text to the largest size on A4, splitting by page, blank lines, lines, or characters, and printing through the standard browser print dialog.

Max Text Print

Added a guide to manually counting objects in photos

Added a guide to manually counting objects with point and rectangle markers, including review flags, multi-image progress, CSV, marked images, and a self-contained HTML viewer.

Count objects in photos

Added Engineering Calculator, Smart Image Sorter, and Image Counter

Added Engineering Calculator for 80 engineering calculations and parameter comparison, Smart Image Sorter for locally sorting up to 500 images with AI, and Image Counter for manual point/rectangle counting on photos.

Engineering Calculator Smart Image Sorter Image Counter

Added a guide to merging and reorganizing PDFs

Added a practical guide to combining PDFs, images, and PowerPoint slides in the browser, including reordering, rotation, removal, selective export, and notes about document features that may not survive editing.

Merge and reorganize PDFs

Added operation demo videos to tool pages

Tool detail pages can now show short operation demos. Videos do not autoplay and switch between Japanese and English versions with the page language.

Browse tools

Added a guide to synchronized vibration measurement with phones

Added a practical guide to using several phones as wireless sensors for synchronized vibration and impact comparison, including mounting, clock alignment, RMS, impact timing, FFT, and accuracy limits.

Measure vibration and impacts with phones

Added Wireless Sensor

Added Wireless Sensor, which connects up to four phones directly to a PC for synchronized acceleration, vibration, tilt, and rotation recording, with impact timing, FFT analysis, CSV, reloadable session JSON, and HTML reports.

View Wireless Sensor

Expanded the About page

Expanded the About page with the reasons for building in the browser, the local-processing approach, recent tool directions, the single-HTML approach, practical guides, and open-source development.

About Browser Kitty

Added Restock List

Added Restock List, a local-first shopping list that tracks regular items as in stock, low, or out and collects only what needs buying now, with suggestions, store/category grouping, purchase history, compressed share links, and JSON backup.

Restock List

Updated SQLite Explorer and Image Compressor & Converter

SQLite Explorer now includes database-wide search, Smart Cell Inspector, record relationship tracing, and Database Health. Image Compressor & Converter now adds Smart Optimize, use-case presets, and a target-size mode that can reduce resolution when quality changes alone are not enough.

SQLite Explorer Image Compressor & Converter SQLite inspection guide

Added Task Packing

Added Task Packing, a finite-capacity visual to-do tool with notes on board tiles, PNG board export, JSON backup, an optional compressed URL backup for small datasets, and a mini board on supported browsers.

Task Packing

Added Device Check and OneFile Album

Added Device Check for testing cameras, audio, displays, and input devices, plus OneFile Album for bundling multiple images and a viewer into one self-contained HTML file.

Device Check OneFile Album

Added tool icons across listings and detail pages

Tool favicons are now used across the home page, tool listing, and detail pages to make individual apps easier to recognize.

Browse tools

Added Text Inspector, Archive Explorer, and Pop-up Face Check-in

Added Text Inspector for local writing analysis, Archive Explorer for inspecting archives before extraction, and Pop-up Face Check-in for temporary local-first event reception.

Text Inspector Archive Explorer Pop-up Face Check-in

Added two new guides

Added guides for redacting faces in photos without uploads and inspecting Parquet files without installing software.

Browse guides

Added screenshots to tool details

Tool detail pages can now show real application screenshots when the source repository provides one.

Browse tools

Improved related tools with workflow guidance

Related-tool cards now explain why to use each tool next, with workflow labels and short contextual guidance.

Browse tools

Added practical guides

Added practical guides for PDF comparison, photo GPS and EXIF checks, SQLite inspection, video compression, and reading QR codes from images.

Browse guides

Improved tool discovery

Added purpose-based category filters to the tool catalog and automatic NEW badges for recently added tools.

Browse tools

Added Random Picker and Same Spot Diff

Added Random Picker for draws, ordering, teams, and roulette, plus Same Spot Diff for aligning photos of the same scene and finding changes.

Random Picker Same Spot Diff

Added Developer Toolbox

Added Developer Toolbox, a collection of 33 handy utilities for Base64, JSON, JWT, cron, regular expressions, hashing, and more.

Developer Toolbox

Added Video Contact Sheet and Video to GIF / WebP

Added Video Contact Sheet for summarizing a video in one image and Video to GIF / WebP for converting a selected range into an animation.

Video Contact Sheet Video to GIF / WebP

Grouped homepage tools by purpose

Reorganized the growing homepage tool list into purpose-based groups such as PDF and documents, images, video, data, and utilities.

View home

Added Signal Screen, PDF Compare, and Photo Privacy Inspector

Added Signal Screen for full-screen messages and QR codes, PDF Compare for comparing two PDFs, and Photo Privacy Inspector for checking photo location and metadata.

Signal Screen PDF Compare Photo Privacy Inspector

Added Pomodoro Timer and Document Scanner

Added Pomodoro Timer for managing focus sessions and Document Scanner for capturing documents on a phone and creating submission-ready PDFs.

Pomodoro Timer Document Scanner

Improved the mobile experience

Improved mobile navigation and homepage cards to make finding and moving between tools easier on phones.

View home