pdf
PDF Organizer
Organize PDFs, images, and PowerPoint slides together, then reorder, rotate, remove, selectively export, and password-protect the result in your browser.
Web tools that run entirely in your browser
Free practical tools for everyday tasks involving PDFs, images, video, data inspection, and more.
Files and tool inputs are not sent to our servers.
No sign-upLocal processingOpen source
FEATURED
Featured tools
video
Video Face Redactor
Detect faces in video locally, redact them, and export an H.264 MP4.
video
Video to GIF / WebP
Convert a selected video range to animated GIF or WebP with crop, size, and FPS controls.
video
Video Contact Sheet
Sample frames across a video and combine them into a single contact sheet image.
image
OneFile Album
Bundle local images and a responsive viewer into one portable, self-contained HTML album.
IN THE BROWSER
More than you might expect from a browser
Tasks that often need desktop software or server processing can also run on your device using browser capabilities.
Detect faces and edit video locallyFace detection, redaction, and MP4 export stay on your device.
Open databases and run SQLInspect DuckDB and SQLite files without uploading them.
Convert video and audio in the browserCompress, trim, convert, and export without a desktop app.
Connect a phone and PC directlyUse a phone as a presentation remote or wireless sensor.
Pack tools and data into one HTML fileBundle images and a viewer so the result travels as one file.
DISCOVER
Browse by purpose
PDF & Documents
pdf
PDF Organizer
Organize PDFs, images, and PowerPoint slides together, then reorder, rotate, remove, selectively export, and password-protect the result in your browser.
pdf
PDF Compare
Compare two PDFs and find added, removed, or changed content.
document
Document Scanner
Scan, perspective-correct, organize, and size PDFs for submission.
office
Office Image Extractor
Extract embedded images from Office files in one go.
pdf
PDF Review Notes
Review PDF text and regions, organize feedback, and export reports.
office
PPTX Version Control
Manage PowerPoint versions, diffs, branches, and merges locally.
pdf
PDF Pipeline Builder
Build PDF workflows with nodes, preview intermediate results, and reuse them as Recipes.
Images & Privacy
image
Image Compressor & Converter
Optimize images by use case and compare size with visual quality.
image
Face Redactor
Detect and redact faces locally with blur, pixelation, and more.
image
Photo Privacy Inspector
Inspect and remove GPS/EXIF metadata before sharing photos.
image
Same Spot Diff
Align slightly shifted Before/After photos and highlight real changes.
image
OneFile Album
Bundle images and a viewer into one portable HTML album.
image
Smart Image Sorter
Sort up to 500 images locally and review only uncertain results.
image
Image Counter
Manually count with point and rectangle markers that preserve location.
image
Photo Re-Enactor
Overlay a reference photo and retake the scene from a similar composition.
Video & Media
video
Video Face Redactor
Detect and redact faces in video locally, then export MP4.
video
Video to GIF / WebP
Convert a selected video range to GIF or Animated WebP locally.
video
Video Contact Sheet
Turn representative video frames into one overview image.
video
Video Compressor
Compress video locally with resolution and bitrate controls.
video
Video Speed Changer
Change video speed from 0.25× to 4× and save an MP4 locally.
video
Lossless Video Cutter
Cut a video range quickly without re-encoding.
video
Media Inspector
Inspect codecs, HDR, metadata, and playback details locally.
video
One Second Montage
Turn photos and videos into an MP4 using one second per item.
Data & Text
text
Markdown Preview Lab
Edit Markdown while comparing GitHub-, Qiita-, and Zenn-style previews.
data
SQLite Explorer
Search SQLite and inspect relationships, cell contents, and database health.
data
Parquet Viewer
Inspect Parquet files directly in your browser without uploading them.
text
Text Inspector
Inspect counts, frequent words, composition, and writing patterns.
data
JSON / YAML / CSV Viewer
Open, search, analyze, and convert JSON, YAML, and CSV data.
data
DuckDB Explorer
Inspect DuckDB structure, data, read-only SQL, profiles, and database differences.
data
DBF Viewer
Inspect DBF structure, encoding, memo data, and records locally.
data
JSONL Viewer
Inspect JSONL / NDJSON records, invalid lines, and field types locally.
data
ORC Viewer
Inspect ORC schema, stripes, statistics, and data locally.
data
Arrow Viewer
Inspect Arrow IPC schema, batches, dictionaries, and data locally.
data
Avro Viewer
Inspect Avro schema, blocks, logical types, and records locally.
data
Schema Diff
Compare schema differences between two Parquet, CSV, or JSONL files locally.
data
Test Data Generator
Generate reproducible test data with missing, boundary, and invalid values.
data
Data Pipeline Builder
Build CSV, JSONL, and Parquet transformations with nodes and reuse them as Recipes.
Utilities
utility
QR Code Reader
Scan QR codes from your camera or saved images and keep scan history locally on your device.
utility
Pocket Level
Use your phone as a browser-based level and inclinometer.
utility
Tap Counter
Quickly tally people, inventory, laps, and more with large tap targets.
utility
Signal Screen
Show large text, arrows, and QR codes full-screen.
utility
Optical File
Transfer a small file experimentally through animated QR frames and a camera.
utility
Developer Toolbox
33 developer utilities for Base64, JSON, JWT, regex, hashes, and more.
utility
Archive Explorer
Explore and preview archives before extracting only what you need.
utility
Device Check
Check cameras, audio, displays, and input devices in one place.
utility
Restock List
Turn low or missing regular items into today's shopping list.
utility
Wireless Sensor
Use up to four phones for synchronized motion, vibration, and impact measurement.
utility
Engineering Calculator
80 engineering calculations with units and parameter comparison.
utility
Handy Convert
Everyday date, time, era, kana, and width conversions.
utility
Wi-Fi Share
Share Wi-Fi details by QR, copy, or print, with experimental NFC tag writing on supported devices.
utility
Temporary Links
Keep temporary links and file paths organized while you work.
Work & Creative
productivity
Random Picker
Pick names, randomize order, split teams, or run a roulette.
productivity
Pocket Teleprompter
Paste a script and auto-scroll it by speed or target duration.
productivity
Pop-up Face Check-in
Run temporary event check-in with local face matching and manual fallback.
productivity
Pomodoro Timer
A local Pomodoro timer that can stay visible in Picture-in-Picture.
music
Music Practice Kit
Tuner, metronome, timer, recorder, and more in one practice kit.
music
Audio Cutter & Joiner
Trim, split, reorder, and join audio clips locally.
productivity
Task Packing
Visualize task size against a finite capacity board.
productivity
Max Text Print
Fit text to the largest A4 size and print it.
productivity
Presentation Remote
Open PPTX/PDF on a computer and use a phone as the WebRTC remote.
productivity
Check-in Desk
Reuse a roster for local check-in, attendance, and entry/exit logs.
productivity
Handwriting Font Maker
Create a TrueType font from handwriting captured in the browser.
productivity
Presentation Video Maker
Turn PowerPoint slides into narrated MP4 video locally.
productivity
Pass-the-Phone Vote
Pass one phone around for a private in-person vote and final reveal.
productivity
PPTX Diff
Compare two PowerPoint files and review semantic and visual changes.
WHAT’S NEW
What’s new
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.
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.
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.
GUIDES
Guides
How to run multiple PDF operations as one reusable workflow
Instead of repeating the same PDF edits manually, build page operations, branches, merges, and document finishing steps as a node pipeline, preview intermediate results, and reuse the workflow as a Recipe or Pipeline JSON.
Read guideHow to compare two PowerPoint files and find the differences
A practical workflow for comparing an original and revised PPTX by matching slides, reviewing structured changes, and checking the rendered appearance.
Read guideWhat’s the difference between file:// and localhost? Why the same HTML can behave differently
Opening an HTML file directly with file:// and serving the same file from http://localhost are different browser environments. Origin rules, HTTP behavior, API requirements, and storage semantics can change even when the HTML is identical. This guide explains why using examples from Browser Kitty.
Read guideNo sign-up, local processing, open source
Browser Kitty works without an account. Files and tool inputs are processed locally in supported tools, and the source code for each tool is available on GitHub.
No sign-upStart without creating an account
Local processingFiles and inputs stay on your device
Open sourceSource code is available on GitHub