Audio Converter
MP3, WAV, M4A, OGG, OPUS, FLAC, AIFF, WMA and AC3.
- Add
- Adjust
- Make
- Keep
How to use this tool
- Add your files — drag them onto the page or choose them. They stay on your device.
- Pick Convert to — MP3 for everywhere, FLAC for a lossless archive, Opus for the smallest honest lossy file.
- Set the bitrate, sample rate and channels (Same as source is right for straight conversions), and optionally trim.
- Press “Convert audio” and download the results, individually or as one ZIP.
About this tool
MP3, WAV, M4A, OGG, OPUS, FLAC, AIFF, WMA and AC3. Free and unlimited, and nothing is uploaded: it all runs in your own browser. Everything is analysed and produced on your own device — nothing is uploaded anywhere, and you can verify it: the tools keep working even offline.
Privacy & limitations
Multi-hundred-megabyte recordings can exhaust the browser's memory — everything runs on your machine, so your machine is the limit. Converting between two lossy formats stacks a second generation of loss — go to WAV/FLAC when the master copy matters.
Last updated:
Frequently asked questions
Which audio format should I choose?
MP3 if it must play on absolutely everything. M4A for better sound at the same size. FLAC to archive without losing anything. Opus for speech and podcasts, where it is far smaller at the same clarity.
Does converting between lossy formats lose quality?
Yes, twice over: the second encoder is working from audio the first one already thinned out. Convert from the best source you have rather than from another compressed copy.
Will converting to FLAC improve an MP3?
No. FLAC preserves exactly what it is given, including everything the MP3 discarded. You get a much larger file that sounds identical.
What bitrate is enough?
192 kbps MP3 is transparent for most listeners on most equipment. 128 is fine for podcasts and audiobooks. Below 96, music starts to sound obviously thin.