Free tool

WAV to M4A converter a tenth of the size, ready for Apple apps.

Drop WAV recordings and download M4A versions that take a tenth of the space and open in iTunes, Apple Music, GarageBand and iMovie.

Drop audio files here or click to choose. MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, or the sound of a video. Several at once is fine.

Convert to Bitrate MP3, M4A and OGG Channels

WAV to M4A converter at a glance

content.win converts audio a whole folder at a time, with no daily cap and no file-size wall.

Works with: MP3, WAV, M4A and AAC, OGG and Opus, FLAC, AIFF, and the sound of an MP4, MOV or WebM. Several at once.
Comes back as: MP3, WAV, M4A, OGG or FLAC, the full length, named after the original.
Runs: In your browser.
Limits: No daily limit and no cap on how many files.
Price: Free. No account, no watermark.

Drop the WAV files in. One or a folder.
Pick a bitrate. 256 kbps keeps a music master sounding like itself; 128 kbps is plenty for a voice recording.
Download the M4As. The full length of each, named after the originals.

Size: A minute of stereo WAV is about 10 MB. The same minute as M4A at 256 kbps is under 2 MB and sounds the same on any speaker.
Apple apps: iPhone, Mac, GarageBand, iMovie and Final Cut take M4A natively. It is also the format Apple Music uses.
Keep the WAV: The WAV is the master. Convert copies to share and keep the original for editing.

What bitrate should I use?

256 kbps for music, 128 to 192 kbps for speech. Above 256 kbps AAC gains almost nothing.

Does M4A lose quality?

A little, by design. At 256 kbps the difference from the WAV is inaudible for nearly everyone.

Can I make the file mono?

Yes. Mono halves the size and suits a voice recording.

Can I convert several at once?

Yes. Drop the folder and one button downloads every M4A.