Tool 17 / Image & Media
Video to Audio Converter
Extract the audio from an MP4, MOV, MKV, WebM or AVI video and download it as an MP3, WAV or M4A file. FFmpeg runs inside your browser as WebAssembly, so the video never leaves your device.
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Pick a video to extract its audio. You will see both file sizes before downloading.
Manual
04 stepsHow to use it
- 01Choose a video file: MP4, MOV, MKV, WebM or AVI, up to 100 MB.
- 02Pick the output format — MP3 (with a bitrate), WAV for lossless PCM, or M4A for AAC.
- 03Wait for extraction. The first run downloads the FFmpeg engine once (about 30 MB); later visits use the browser cache.
- 04Download the audio file. Nothing is uploaded at any point.
Example
What it looks like
- Input
- 5 minute MP4, 48 MB, H.264 video with AAC audio
- Output
- MP3 at 192 kbps, roughly 7 MB
WAV output is lossless but large — about 10 MB per minute of stereo audio.
Method
How it works
The page loads FFmpeg compiled to WebAssembly and runs it inside a Web Worker, so the interface stays responsive while the audio is extracted. Your file is read with the File API and never sent over the network.
MP3 uses the LAME encoder and M4A uses AAC — both re-encode the audio at the bitrate you choose. WAV copies the decoded samples as 16-bit PCM with no compression, which preserves quality but produces much larger files.
The video stream is dropped with the -vn flag, so only the first audio track is converted. Extraction is single-threaded in the browser, so very long videos can take a few minutes on slower devices.
Closing the tab discards everything: the engine, your file and the result all live in page memory only.
FAQ
Before you ask
Specific to video to audio converter, including limits and privacy.
Is my video uploaded anywhere?
No. Conversion runs entirely in your browser with WebAssembly FFmpeg. The video file, the extracted audio and the file name all stay on your device — there is no upload, no server processing and no storage.
Which formats can I use?
MP4, MOV, MKV, WebM and AVI are accepted, covering what phones, screen recorders and cameras produce. Output can be MP3, WAV or M4A. MKV and AVI files with unusual codecs may fail — the tool reports the FFmpeg error when that happens.
Is there a file size limit?
Videos up to 100 MB are accepted. The whole file is held in browser memory during conversion, so smaller files convert faster and are less likely to hit device memory limits, especially on phones.
Why is my WAV file so big?
WAV stores uncompressed PCM audio — about 10 MB per minute of stereo sound at CD quality. Choose MP3 for sharing and archiving, or M4A for a good quality-to-size balance at the same bitrate.
Does converting reduce audio quality?
MP3 and M4A are lossy formats: a higher bitrate keeps more detail, with 192–320 kbps sounding transparent for most listeners. WAV is lossless, so it keeps exactly what the source had at the cost of a much larger file.
Privacy
Conversion happens in your browser with FFmpeg compiled to WebAssembly. Your video and the extracted audio are never uploaded, transmitted or stored on our servers.
Read the privacy policy for data retention, analytics and contact details.
Limits
Results depend on the input you provide and your browser. Always sanity-check important numbers before publishing or billing.
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