Audio Converter
MP3, WAV, M4A, OGG, OPUS, FLAC, AIFF, WMA and AC3.
Convert audio between MP3, WAV, M4A, FLAC, OGG, OPUS, AIFF and WMA, in bulk, at the bitrate you choose. Free, no sign-up, nothing uploaded.
What Audio Converter is for
For a track that will not play, or will not import: WMA from an old Windows collection, FLAC a phone refuses, an OGG from a game, or M4A that a car stereo will not read.
Choosing a format
MP3 plays everywhere. M4A (AAC) sounds better at the same size and is Apple's default. OPUS is the smallest for speech. FLAC is lossless at about half the size of WAV. WAV and AIFF are what editors and samplers expect.
Choosing a bitrate
128 kbps is fine for speech and casual listening, 192 for music, 256 to 320 if the file is a master you will keep. Converting a low-bitrate file to a higher one does not improve it.
Extra adjustments
Set the sample rate, fold to mono for voice recordings, adjust the volume and trim the ends in the same pass.
How to use it
- Add your files. Drop them on the page or choose them. They stay on your device.
- Set the output format and quality. The defaults suit most files.
- Press convert and save the results, individually or as one ZIP.
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.