Convert audio between formats without uploading a thing. Pick a conversion, drop in your file, and Solmi decodes and re-encodes it on your own device — M4A, WAV, FLAC, OGG, Opus, and AAC into MP3, or MP3 into uncompressed WAV. No signup, no file-size limit, no watermark, and your audio never leaves your browser.
The converter reads whatever your browser can decode and writes two formats: MP3, which plays everywhere, and WAV, for editing.
| Source file | Converts to | Good to know |
|---|---|---|
| WAV | MP3 | A CD-quality 16-bit WAV gets 4 to 11 times smaller, depending on the bitrate |
| M4A / AAC | MP3 | iPhone voice memos and Apple exports; protected files (M4P) do not convert |
| FLAC | MP3 | Lossless to compressed: keep the FLAC as your master |
| OGG / Opus | MP3 | Opus voice notes and OGG Vorbis files |
| MP4, MOV, WebM video | MP3 | Only the audio track is decoded; the picture is ignored |
| MP3 | WAV | Uncompressed 16-bit WAV for an editor or a DAW |
1. Choose your audio or video file, on a computer or a phone. 2. Leave MP3 as the output, or pick WAV to convert an MP3 to WAV. 3. Pick the bitrate: 192 kbps is the usual balance of size and quality, 320 kbps stays closest to the source. 4. Press Convert, play the result on the page, then download it.
The file is decoded by your browser's Web Audio API and encoded to MP3 by a LAME encoder running on your device. The file itself is not sent to a server and is not stored anywhere: it never leaves your computer or phone. Close the page and the only copy left is the one you downloaded.
You can convert M4A, WAV, FLAC, OGG, Opus, and AAC into MP3, and MP3 into WAV. The decoder uses your browser's own audio codecs, so in practice anything your browser can play can be read — the output side is deliberately limited to MP3 and WAV, the two formats we can encode properly in the browser.
Your file is decoded to raw audio samples with the Web Audio API, then re-encoded into the target format — MP3 through a LAME encoder compiled to JavaScript, WAV by writing 16-bit PCM directly. Both steps happen on your device, so the file never travels anywhere.
There is no fixed limit. Very long files are bounded by your device's memory rather than by a server quota, since everything is processed locally. A typical three-to-five minute song converts in a few seconds.
It depends on the direction. Going to MP3 is lossy: the encoder discards data to shrink the file, though at 192 kbps and above the difference is very hard to hear. Going to WAV is lossless in the sense that nothing further is discarded — but it cannot restore detail that a compressed source already lost.
No. The converter does not download from YouTube or any other site; it converts files that are already on your device. If you have the video as an MP4, MOV, or WebM file, for example one you shot or exported yourself, drop it in to get the audio as an MP3.
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.