Why "no upload" matters here
Most online audio extractors are upload services: your 800 MB video crawls to their server, gets processed, and the result crawls back — with a queue, a size cap and a privacy policy in between. This tool ships the audio engine to your browser instead of shipping your video to a server. That inverts everything: extraction starts instantly, file size limits all but disappear, unreleased footage stays private, and the lossless copy mode finishes a two-hour recording in seconds.
Lossless copy vs re-encode
Nearly every camera and phone records AAC audio inside the video container. M4A mode simply lifts that stream out untouched — bit-for-bit identical to what was recorded, no generation loss, near-instant. MP3 and WAV modes re-encode, which takes roughly the clip's own duration and is only worth it when a downstream tool demands those formats. (Rule of thumb: podcasts and editors → M4A; ancient car stereos → MP3; DAWs and transcription pipelines → WAV.)
Estimating sizes first? One hour of audio ≈ 60 MB as AAC/M4A, ~120 MB as 320 kbps MP3, ~600 MB as WAV. For video-side math, see the bitrate calculator and recording time calculator.
FAQ
How do I extract audio from a video for free?
Choose your video file above, pick an output format, and click Extract. The audio track is pulled out of the video entirely on your device — no upload, no account, no watermark, no length limit beyond your device’s memory.
Which format should I choose — M4A, MP3 or WAV?
M4A (lossless copy) is the best default for most videos: it takes the original AAC audio out untouched in seconds, with zero quality loss. Choose MP3 when you need maximum compatibility with old players or editing software. Choose WAV when an editor or transcription tool demands uncompressed audio — files are large (~10 MB per minute).
Why is my file not uploading anywhere — how does this work?
The page runs a WebAssembly build of FFmpeg — the same audio engine used across the video industry — directly in your browser. Your file is read locally, processed locally, and the result is saved locally. You can disconnect from the internet after the page loads and it still works.
Is there a file size limit?
The practical limit is your browser’s memory — roughly 2 GB. For a long recording, the fast M4A copy mode handles big files best because it does not re-encode. If a very large file fails, try closing other tabs first.
Can I extract audio from an iPhone video?
Yes — iPhone .MOV/.MP4 files carry AAC audio, which the M4A copy mode extracts losslessly in seconds. Open this page in Safari on the phone itself, or transfer the video to a computer first.