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Audio Cutter & Joiner

Trim, split, reorder, preview, and join multiple audio clips locally into MP3, M4A/AAC, or WAV.

Video Speed Changer

Speed video up or slow it down from 0.25× to 4.00×, choose audio behavior and quality, and save an MP4.

Developer Toolbox

A local developer toolbox with 33 utilities for Base64, JSON, JWT, cron, regex, hashes, text, web formats, and more.

Random Picker

Pick winners, randomize order, split teams, or spin a roulette from a candidate list in your browser.

Same Spot Diff

Align slightly mismatched before/after photos and highlight the areas that truly changed.

Text Inspector

Analyze character counts, text composition, frequent words, long sentences, and writing patterns entirely in your browser.

Archive Explorer

Explore ZIP, 7z, RAR, TAR, GZIP, CAB, ISO, LZH, and more before extraction, then preview or save only what you need.

Pop-up Face Check-in

A local-first face-matching check-in tool for temporary events, with manual check-in and entry/exit tracking when needed.

Device Check

Check cameras, microphones, speakers, displays, input devices, gamepads, and motion sensors from one browser tool.

OneFile Album

Bundle local images and a responsive viewer into one portable, self-contained HTML album.

Task Packing

A local-first visual to-do that sizes tasks as area and places only the work that fits on a finite capacity board.

Restock List

A local-first restock list that tracks regular items as in stock, low, or out and collects only what needs buying now.

Wireless Sensor

Connect up to four phones to a PC as wireless motion sensors for synchronized recording, comparison, impact detection, and FFT analysis.

Engineering Calculator

Run 80 engineering calculations across mechanical, fluids, thermal, electrical, and related fields with unit conversion and parameter comparison in the browser.

Smart Image Sorter

Sort up to 500 images with local AI, review uncertain results, and save the original files into category ZIPs.

Image Counter

Manually count objects in photos with point or rectangle markers while preserving counted locations, review flags, and multi-image progress for export.

Max Text Print

Fit text to the largest size that fits A4 and print one-page, line-by-line, or character-by-character layouts in a single print job.

Presentation Remote

Open a local PPTX or PDF on your computer and control it from a QR-paired phone, with current/next slide previews and speaker notes.

Photo Re-Enactor

Overlay a reference photo on the live camera and use composition guidance plus four view modes to retake a scene from a similar composition.

One Second Montage

Combine photos and videos into an MP4 using one second from each item, with optional looping music and capture-year divider cards.

Check-in Desk

Reuse a roster for check-in, attendance, and entry/exit sessions, then review history and export CSV or JSON on one device.

DuckDB Explorer

Open DuckDB files locally and inspect structure, data, guarded read-only SQL, and database differences.

Handy Convert

Handle everyday date, time, Japanese era, kana, and full-/half-width conversions entirely in the browser.

Handwriting Font Maker

Draw characters in the browser and turn the captured pen coordinates into a downloadable TrueType font (TTF).

DBF Viewer

Open DBF files locally and inspect field definitions, records, encodings, and DBT/FPT memo data.

JSONL Viewer

Scan JSONL / NDJSON locally and inspect invalid lines, field presence, mixed types, and records.

ORC Viewer

Inspect Apache ORC schema, stripes, column statistics, metadata, compression, and data in the browser.

Arrow Viewer

Inspect Apache Arrow IPC File / Stream schema, record batches, dictionaries, metadata, and data locally.

Avro Viewer

Inspect Apache Avro Object Container File schema, metadata, blocks, logical types, and records locally.

Schema Diff

Compare two Parquet, CSV, TSV, JSONL, or NDJSON files and inspect schema additions, removals, type changes, and more.

Wi-Fi Share

Share Wi-Fi connection details by QR code, copy, large display, print layout, and experimental NFC tag writing on supported devices.

Test Data Generator

Generate reproducible test data locally with configurable columns, row count, Seed, and optional missing, boundary, or invalid values.

Presentation Video Maker

Turn PowerPoint (PPTX) slides into narrated MP4 videos locally using speaker notes, recordings, or local audio files.

Pass-the-Phone Vote

Pass one phone around for private in-person voting, keep intermediate results hidden, and reveal only the final tally after everyone votes.

PPTX Diff

Compare two PowerPoint (PPTX) files locally and review semantic changes in text, numbers, images, layout, formatting, speaker notes, and visual appearance.

PDF Review Notes

Add review comments to PDF text or regions, track resolution status, and export Markdown, CSV, or standalone HTML reports locally.

PPTX Version Control

Manage PowerPoint (PPTX) versions locally with semantic and visual diffing, branches, 3-way merge, and conflict resolution in the browser.

PDF Pipeline Builder

Build PDF processing as a node pipeline, inspect intermediate results, and reuse saved Recipes with other PDFs.