Convert M4A, FLAC, OGG, AAC and Opus to MP3 - or MP3 to WAV. Batch convert and download as ZIP.
Free, runs in your browser.
Your files never leave your device - conversion runs locally, so a full batch finishes in seconds with no upload wait.
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Explore channelsAn audio converter changes an audio file from one format or codec to another - for example turning an M4A voice memo into an MP3 that plays anywhere. This one runs entirely in your browser: your files never upload to a server, decoding and encoding happen locally on your device.
It accepts WAV, MP3, M4A, FLAC, OGG, AAC and Opus files as input and converts them to MP3 (128-320 kbps) or uncompressed WAV.
M4A is the default format for Apple Music purchases and iPhone voice memos, but not every app or device plays it. MP3 plays everywhere. Here is how to convert M4A to MP3:
Select WAV as the output format and the converter produces uncompressed 16-bit PCM WAV files. That is useful for DAWs, samplers, and CDJs that want lossless input - some hardware and software simply works better with WAV than with compressed formats.
One thing to know: converting MP3 to WAV does not restore quality that was already lost when the MP3 was made. It repackages the audio losslessly from that point on, so no further quality is lost in editing or playback chains that re-encode compressed input.
FLAC to MP3 - FLAC is the standard for lossless music archives, but its files are big and support outside desktop players is patchy. Convert FLAC to MP3 at 320 kbps for portable copies that play on anything.
OGG and Opus to MP3 - OGG and Opus show up in game audio, stream rips, and voice notes from messaging apps. Convert them to MP3 to edit, share, or play them in tools that do not support those codecs.
AAC to MP3 - raw .aac streams (as opposed to AAC inside an M4A container) play in fewer places than you would expect. Converting to MP3 makes them universally compatible.
Note: OGG and Opus input may not work in Safari - use Chrome or Firefox for those.
320 kbps is the highest bitrate the MP3 format supports, and it is this converter's default. In blind listening tests, a 320 kbps MP3 is nearly indistinguishable from a lossless original at a fraction of the file size.
Converting WAV files specifically? Use our dedicated WAV to MP3 converter.
The bitrate controls how much audio data the MP3 file keeps per second. Here is a practical breakdown:
When in doubt, go with 320 kbps. The file size difference between 128 and 320 is only a few megabytes for a typical song, but the quality gap can be significant.
Drop in any mix of formats - a folder of M4As, a few FLACs, an OGG rip - and convert them all in parallel. Every file gets the same output format and bitrate settings, and when they are done you download the whole batch as a single ZIP.
Both output formats have their place. Here is how they compare:
| MP3 (320 kbps) | WAV | |
|---|---|---|
| Size | ~7.5 MB per 5-min song | ~50 MB per 5-min song |
| Quality | Very good (lossy) | Perfect from source (lossless PCM) |
| Compatibility | Plays everywhere | Universal, but heavy for sharing |
| Editing use | Reference and playback | DAWs, samplers, mastering |
Pick MP3 when you are sharing, streaming, or saving space. Pick WAV when a DAW, sampler, or upload target wants lossless input.
SoundCloud accepts lossless uploads and recommends them - it re-compresses every upload for streaming, so a lossless source gives the best result. Convert to WAV for your upload masters, and to MP3 at 320 kbps for promos and demos sent over email or DMs.
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Find channels on PremierelyYes, completely free. No signup, no watermark, no file limit beyond 100 MB per file.
No. Conversion happens entirely in your browser using the Web Audio API. Your audio never leaves your device.
Drop your M4A files onto the converter, choose MP3 and a bitrate (320 kbps for best quality), then hit convert. Download files individually or as a ZIP.
Yes. Select WAV as the output format. You get uncompressed 16-bit PCM WAV files that work in any DAW or player.
320 kbps is near-transparent quality for music and the safe default. Use 192 kbps to save space, or 128 kbps for voice recordings.
Yes. Add as many files as you want, mix input formats freely, convert them all in parallel and download everything as one ZIP.
WAV, MP3, M4A, AAC and FLAC input work in Safari. OGG and Opus input may not - Safari doesn't decode those codecs. Chrome and Firefox handle all seven.
Converting to MP3 is lossy, so always start from the best source you have. Converting to WAV is lossless from the point of conversion - it won't degrade the audio further.
100 MB per file. There's no limit on the number of files.
Converting WAVs specifically? Our WAV to MP3 converter is built for that. Add smooth fades with the audio fade tool, grab audio from a clip with the TikTok to MP3 converter, or inspect and edit tags with the audio metadata editor. Every tool runs free in your browser with no upload.