Excel Converter
Convert many spreadsheets at once: every sheet to CSV, old .xls files to .xlsx, workbooks split into a file for each sheet, or everything combined into one file. Also JSON and HTML. Your files are never uploaded.
Apps
Small JavaScript apps and tools.
4 apps need a computer, so they’re hidden here.
JS Console
Write JavaScript and run it right in your browser, with the console output beside your code. Nothing to install or sign in to.
Query Files
Query CSV, Excel and JSON files with SQL, right in your browser: join them, reach into JSON values, and download the results. Your files are never uploaded.
Subtitle Editor
Create and edit WebVTT subtitles against a video: line them up with its waveform, edit two tracks side by side, and import or export them as Excel.
Needs a computer
Screen Recorder
Record your screen, a window or a browser tab, with your microphone and your camera in a corner. Preview the video, then download it. Everything stays in your browser.
Needs a computer
File Renamer
Rename the files in a folder on your computer: find and replace, change case, add numbers or dates, edit names by hand, or use your own JavaScript or a spreadsheet.
Needs a computer
Presenter
Show images, videos and PDF slides from your computer on another screen, like a projector or TV, with music if you like, and control it all from this tab.
Needs a computer
Song Mixer
Play your songs with smooth mixes between them: beats matched, bass swapped and timed for you, right in your browser.
JS Minifier
Minify JavaScript, TypeScript or JSX in your browser, and turn code or a GitHub Gist into a bookmarklet.
Crypter
Encrypt and decrypt messages with home-made ciphers for fun, or with Web Crypto (AES-GCM) when it matters.
JSON Explorer
Paste, open or fetch JSON, then explore it: search its keys and values, open nested objects and arrays in their own tabs, and see arrays of objects as tables.
Date & Time Converter
See one moment in as many time zones as you like, find a time that works for everyone, and turn timestamps into dates.
Bible Notes Merger
Merge two backups of your Bible study notes, highlights, bookmarks, tags and playlists into one, choosing what to keep wherever they differ. It all happens in your browser.