Real format conversion, running in your browser
A voice memo in the wrong format, an audio file a piece of software won't accept, a recording that needs to be smaller before sharing — audio format mismatches come up constantly. This tool converts between MP3, WAV, and OGG using FFmpeg compiled to WebAssembly, running entirely inside your browser rather than uploading your file to a server first.
Choosing a format
| Format | Compression | File size | Best for |
|---|---|---|---|
| MP3 | Lossy | Small | Broad compatibility, sharing, general listening |
| WAV | Lossless | Large | Editing, archiving, when quality matters most |
| OGG | Lossy | Small | Open format needs, games, some software |
Using it
- Upload the audio file you want to convert.
- Choose the target format.
- Download the converted file once processing finishes.
Advantages and limitations
Advantages
- Real FFmpeg conversion, not a simplified reimplementation
- No upload wait, no server queue
- No conversion count limit
Limitations
- Converting lossy-to-lossy compounds quality loss slightly
- Converting to WAV doesn't restore detail lost in a prior lossy encode
- Longer files take proportionally longer to process
A note on bitrate
When audio is encoded into a lossy format like MP3, its bitrate controls how much detail gets kept — higher bitrates mean better quality and larger files, lower bitrates mean smaller files with more audible compression artifacts, especially in complex music with many instruments. For spoken-word audio like a podcast or a recorded meeting, a fairly modest bitrate is usually perfectly acceptable, since speech doesn't demand the same fidelity music does.
Pairs well with
If your audio has background noise, the site's Audio Noise Remover & Enhancer is worth running before converting, and Audio Transcriber can turn spoken audio into text once it's in a format you're happy with.
Nothing leaves your device
Conversion happens locally — see the Privacy Policy for full details.
Frequently asked questions
+Is this audio converter really free, with no sign up?
Yes. There's no account and no limit on how many files you can convert.
+Do you upload my audio to a server?
No. Conversion runs through FFmpeg compiled to WebAssembly, executing directly in your browser — your audio file is never transmitted anywhere.
+Which format should I actually use?
MP3 for broad compatibility and small file size when some quality loss is acceptable, WAV when you need lossless quality (like for further editing) and file size doesn't matter, and OGG when you specifically need an open, patent-free format, common in some software and games.
+Will converting to MP3 lower the quality?
Yes, if you're converting from a lossless format like WAV — MP3 is a lossy format, meaning it discards some audio data to shrink file size. Converting between two lossy formats (like OGG to MP3) can compound quality loss slightly further, since each lossy encoding step loses a bit more.
+Why is my WAV file so much larger than the original?
WAV stores audio uncompressed, so it's inherently large regardless of the source. If you're converting from a compressed format like MP3 to WAV, the file size increases substantially even though no new audio detail is actually being added — it's just stored less efficiently.
+Is there a file size or length limit?
No hard limit, though longer audio files naturally take more time to process since your own device's processor handles the conversion.