About AudioSaw

AudioSaw is a browser-based audio toolkit for musicians, podcasters, and anyone with a folder of voice memos. Convert formats, cut clips, join takes, normalize loudness — all without uploading your audio to anyone else's server.

01.How it works

The whole site is static. HTML, CSS, and JavaScript, no server doing anything. When you drop a file on the page, it goes into your tab's memory and gets handed to:

• The Web Audio API, which is what your browser already uses to play audio. It decodes MP3, WAV, M4A, FLAC, OGG, AAC, and the audio tracks of MP4, MOV, WebM — natively, no library needed.
• lamejs, a pure-JavaScript port of the LAME MP3 encoder. Used for MP3 output.
• ffmpeg.wasm, a slim WebAssembly build of FFmpeg. Lazy-loaded only when you need formats Web Audio can't write directly (M4A, AAC, FLAC, OGG, OPUS) or audio extracted from video.

If you want to test the "nothing uploads" claim: load this page, turn off your wifi, then try any tool. They all keep working.

02.Why bother

Search "audio converter online" and you'll find a dozen sites that want you to upload the file, wait, then download the result. For an unreleased track or a private voice memo, that's a bad deal. AudioSaw exists because the browser can already do the work directly. Drop, convert, done.

The hosting bill is basically zero — it's static files on a CDN, and your computer does the actual work. There's no account, no upsell, no email field anywhere. No Pro tier. No file-size paywall. No daily quota. What it does have is ads, from Journey by Mediavine: they pay for the domain and the time that goes into the tools, and like everything else here they never see your files.

03.What it's built on

• Web Audio API (browser-native)
• lamejs — MIT
• ffmpeg.wasm — LGPL (the WebAssembly build follows the upstream FFmpeg LGPL license)

AudioSaw is not affiliated with the FFmpeg project. We just ship a build of their open-source library.

04.What it won't do

• Convert DRM-protected files (Apple Music .m4p, Spotify downloads). Those are encrypted; we can't decrypt them, and we wouldn't try.
• Process files larger than your browser's memory budget — typically around 500 MB on a laptop, less on a phone.
• Edit beyond what's exposed in the UI. For multitrack editing or VST plugins, use a DAW.

If it saved you ten minutes, bookmark it. Tell the friend whose phone is full of voice memos.