100% local · 0 uploads · open source
Drop an MP4, MOV, MKV, WebM, or AVI into the box on the right and get back MP3, WAV, AAC, M4A, FLAC, or OGG — extracted by your own CPU, in your own browser. No upload step, no daily limit, no account, no watermark.
interview-final.mp4
742 MB · H.264 / AAC · 47 min
Output
MP3
Bitrate
192 kbps
Size
64.8 MB
interview-final.mp3
Saved locally · never uploaded
Try it
Drop a video here, or click to choose
MP4, MOV, MKV, WebM, AVI and more — your file never leaves this browser.
100% local
Files never uploaded.
Seconds, not minutes
WebCodecs streaming engine.
No size cap
Multi-GB inputs supported.
Open source
Every line on GitHub.
Conversion runs inside your browser tab with WebCodecs and a small WebAssembly fallback. No upload, no server processing, no temporary cloud copy. Disconnect your Wi-Fi after the page loads and the converter still works.
Outbound bytes
0
Server copy
None
Retention
0 s
No cap
Streaming engine handles multi-gigabyte MP4, MOV, MKV, WebM in real time.
5 KB primary
MediaBunny (WebCodecs) for MP4 · MOV · MKV · WebM. FFmpeg WASM only for legacy formats — and only on demand.
Who uses this
Not a research toy — a tool tuned for the four conversions that cover the vast majority of real day-to-day audio extraction.
Usually MP4 or MOVRiverside, Zencastr, Descript, and Zoom all export video MP4 even when you only need the audio. Strip the video track, ship the MP3 to your feed.
Photo: Will Francis / Unsplash
MP4 / WebM / MKVRecorded Zoom, Teams, Webex, and Google Meet sessions become long voice-only MP3s perfect for commutes. Webinars and MOOC downloads handled the same way.
Photo: Christin Hume / Unsplash
MOV (iOS) · MP4 (Android)Capture a tutorial, voice memo, or product walkthrough on your phone, AirDrop or share it here, and download an audio-only version you can paste into a podcast feed.
Photo: Unsplash
MKV · AVI · WMVOld camcorder AVIs, Blu-ray rip MKVs, music videos from your own collection — extract the soundtrack without dragging the whole file into a video editor.
Photo: Unsplash
The honest comparison
The default online converters — CloudConvert, Zamzar, 123apps, Convertio — all do the same thing: take your file, hold it on their servers, charge you (in time or money) for the privilege. Here is what changes when the work moves into your browser.
Privacy story
Every other “privacy-first” converter still moves the file off your device. We made the simpler architectural choice: don't have a server in the first place.
DevTools verification
Open the Network tab in your browser, start a conversion, watch zero upload requests fire. Nothing to take on faith.
Works offline
After the first page load, you can disconnect Wi-Fi entirely. The conversion still completes. Try it.
No retention, no logs
There is no server-side anything. Your file is read into a temporary buffer in your tab, processed, and discarded.
Cookieless analytics
Plausible counts page views without tracking individuals, without cookies, and without storing IP addresses.
How it works
Pick your video
Drag and drop, or click to choose. Your file stays on your device.
Choose output format
MP3, WAV, AAC, M4A, FLAC, OGG, or Opus. Set bitrate if you care.
Download the audio
Extraction runs in your browser. Save the file when done.
Output format guide
Seven output formats sound like overkill until you actually need a FLAC for archival or an Opus for podcast distribution. Here's when to use which.
MP3
Voice, music for general use
The universal default. Plays in every car stereo, every Bluetooth speaker, every device older than ten years. Pick this when you aren't sure.
M4A (AAC)
Apple ecosystem
Better quality than MP3 at the same bitrate. The Apple-native choice for iTunes libraries, iPhone ringtones, and AirPods listening.
WAV
Editing master
Uncompressed, bit-perfect copy of the original audio. Use it as the source when you'll edit further in Audacity, Audition, Logic, or Pro Tools.
FLAC
Lossless archive
Lossless like WAV, but about half the file size. The audiophile choice for music archives, Hi-Fi playback, and offline collections.
OGG Vorbis
Open-format pipeline
Royalty-free open format. Good for web players, game audio, and open-source projects where MP3 licensing matters.
Opus
Modern streaming
The most efficient modern codec. Best quality per kilobyte — perfect for podcasts, voice clips, and low-bandwidth streaming.
No. Every byte of your video stays inside this browser tab. The conversion runs locally with WebCodecs and WebAssembly. You can verify this by opening DevTools, watching the Network tab, and confirming no upload requests fire — or by disconnecting your network entirely after the page loads; conversion still works.
For MP4, MOV, MKV, and WebM the fast engine streams the file and works comfortably with multi-gigabyte inputs. Older containers (AVI, FLV, WMV, 3GP) fall back to a slower engine capped at roughly 2 GB by the browser's WebAssembly memory ceiling.
MP3, WAV, AAC, M4A, FLAC, OGG (Vorbis), and Opus. Pick MP3 for maximum compatibility, M4A or AAC for Apple devices, WAV or FLAC for lossless quality, and Opus when you need the smallest possible file at a given quality.
Yes. Modern Safari (iOS 16.4+) and Chrome on Android both support the WebCodecs and WebAssembly features required. Very long videos on low-RAM phones may take longer; nothing is uploaded either way.
There is no catch. The site is open source and runs entirely as static files on Cloudflare's edge — there are no server costs to recover. No ads, no account, no tracking beyond a privacy-friendly Plausible page-view counter.
Those services upload your file to their server, process it there, and let you download the result. Your video sits on their machines, subject to their privacy policy and retention rules. Here, nothing ever leaves your device — the conversion is done by your own CPU.
Not directly — we don't download from YouTube or any other streaming site. If you legally have a video file (your own upload, an offline-saved file, content you own), drop it here and we'll extract the audio. We deliberately stay out of the gray area.
192 kbps is the right default for spoken-word (podcasts, lectures, voice memos). Pick 320 kbps for music or anything where audio quality matters. Pick 128 kbps when you want the smallest possible file and the source is voice-only. WAV and FLAC are lossless — no bitrate choice applies.