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.
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 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.