Get the sound of an MP4 as an uncompressed WAV. Drop in a phone video, a screen recording, or an exported edit, and Solmi decodes its audio track and writes a standard 16-bit PCM WAV, ready for a DAW, an audio editor, or a transcription tool. It all runs in your browser, so the video is never uploaded.
1. Choose the MP4 from your computer or phone. 2. Press Convert. Your browser decodes the audio track and Solmi writes a 16-bit PCM WAV; the video is not uploaded. 3. Play the WAV on the page, then download it and open it in your editor.
Both come out of the same audio track. WAV keeps it uncompressed for editing; MP3 makes a small file for listening.
| Output | Size per minute | Use it for |
|---|---|---|
| WAV, 16-bit, 48 kHz stereo | About 11 MB | Editing, DAWs, transcription, samplers |
| MP3 at 320 kbps | About 2.4 MB | Music you will listen to or share |
| MP3 at 128 kbps | About 1 MB | Lectures, interviews, voice |
Drop the MP4 onto the converter and press Convert. Your browser decodes the video's audio track, Solmi writes it out as a 16-bit PCM WAV, and the file is ready to play or download on the page. Nothing is uploaded.
It is a more faithful copy. The audio inside an MP4 is usually AAC, which is already compressed. A WAV stores the decoded audio without compressing it again, while an MP3 adds a second round of lossy encoding. The WAV cannot add detail the AAC track never had, but nothing more is lost, which is why editors and DAWs prefer it.
WAV is uncompressed. Stereo audio at 48 kHz takes about 11 MB per minute, whatever the source bitrate, so a ten-minute video gives a WAV of roughly 110 MB. If you only want to listen or share, the MP4 to MP3 converter makes a file about a seventh of that size.
Yes. The picker accepts any video: MOV works in every major browser, and WebM in Chrome, Edge, and Firefox. MKV and AVI are not decoded by browsers, so remux them to MP4 first.
No. This converter does not download from YouTube or any other site; it converts video files that are already on your device. If the video is yours, download it from your own account first, then drop the file in.
No. The converter runs entirely in your browser: your file is decoded and re-encoded on your own device, and nothing is sent to a server. That is also why it is fast — there is no upload wait and no download wait, just the conversion itself.
Yes, completely free with no signup, no file-size paywall, and no watermark. Once your audio is converted, you can turn the track into a music video with Solmi's AI music video generator — also free to start.