Convert WAV to M4A.
Shrink a large WAV recording into an M4A (AAC) file that plays on iPhone, Mac, Android and most players.
From recording to sharing
Recorders, DAWs and screen-capture tools write WAV, which is ideal for editing and far too big to email or upload. M4A is the compact format Apple uses for music and voice memos.
M4A or MP3?
Both are lossy. AAC in M4A is generally a little more efficient than MP3 at the same size, and it is native on Apple devices. MP3 is the most universal choice.
Keep the master
Once audio is lossy, re-encoding loses more each time. Keep the WAV if you may edit again.
How it works
- 01
Upload your WAV
Drop a file or pick one from your device. Private by default.
- 02
Encode with ffmpeg
ffmpeg encodes the audio as AAC in an M4A container.
- 03
Download
Grab your M4A.
A fraction of the WAV's size
Plays on Apple devices and most players
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Open-source ffmpeg engine
WAV to M4A: re-encoded
M4A is a compressed, lossy audio format, so this re-encodes the sound and the file gets smaller. Every lossy re-encode sheds a little quality, so convert from the best source you have rather than chaining conversions.
Need more than a conversion?
Send your audio or video to TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items: automatically.
Common questions
Is it free?+
Yes. Convert WAV to M4A free. No signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.
Is my file private?+
Your file is uploaded to a private bucket, converted on our own engine, and auto-deleted after 1 hour. It is never sent to a third-party converter.
How much smaller will it be?+
Typically around a tenth of the WAV, because WAV stores uncompressed audio and AAC is an efficient lossy codec.
Will I hear a difference?+
For voice and most listening, no. AAC is lossy, so keep the WAV as your master for editing, mastering or archiving.
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