AAC is the audio inside most MP4 and M4A files, and some recorders, call apps and radio streams save it on its own as .aac. Older players, car stereos and upload forms often want MP3 instead. Drop the file here and get an MP3 back, converted in your browser.
Your file never leaves your device. Nothing is uploaded.
Drop an audio or video file here
Drop an .aac (or .m4a) up to 500MB. It stays on your device.
Conversion runs on FFmpeg, compiled to WebAssembly, inside this browser tab. Licences and source
Both are lossy, so a little is lost each time. Choose an MP3 bitrate at or a step above the AAC's own (often 128 to 256 kbps) and the difference is very hard to hear.
Nowhere. The converter runs inside your browser tab, so the file is read and converted on your own device and saved straight back to it. It is never uploaded to Wave or anyone else, and we never see its name or contents.
M4A is a container that usually holds AAC audio plus tags; .aac is the bare audio stream. The converter opens both, so use this page or the M4A to MP3 page for either.
Yes. Convert it to MP3, then click "Transcribe this file for free" to send it to the free Wave AI transcription tool for a transcript with speaker labels and a summary.
Related: Free Audio Converter That Never Uploads Your File · Free audio transcription · Free YouTube Transcript Generator
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