WAV to M4A Converter – Free Online

How to Convert WAV to M4A Online

Upload your WAV file

Drag and drop your .wav file onto the page or click to browse. You can select several WAV files at once to batch-convert them.

M4A is preselected

The output format is already set to M4A, so you can convert immediately. If you need to, adjust the audio codec, bitrate or sample rate in the settings panel first.

Convert and download

Click Convert. The M4A file is processed on your own device; nothing is uploaded to a server. When it finishes, click Download to save it (or Download all to get a batch as a ZIP).

Why Convert WAV to M4A?

M4A with AAC is the format Apple devices and iTunes prefer, offering MP3-beating quality at around a tenth of a WAV's size. Converting WAV to M4A is ideal for voice memos, podcasts and music bounces headed for an iPhone or Apple Music library.

You can also choose ALAC inside M4A for a lossless file that stays around half the size of WAV. Either way, the conversion runs in your browser and keeps title, artist and album tags.

Private by design: your WAV file is converted on your own device and never uploaded.
M4A preselected: the output format is already chosen, so it is a one-click conversion.
Batch friendly: convert several WAV files in one go and download them as a ZIP.
No limits, no watermark: free for files of any size, with nothing stamped on the output.

WAV vs M4A

WAV (Waveform Audio File Format): WAV stores uncompressed PCM audio exactly as it was recorded. It is the standard for audio editing, mastering and archiving, at the cost of large files (about 10 MB per minute of CD-quality stereo). It is best for editing, mastering, DAWs and archiving.

M4A (MPEG-4 Audio): M4A is audio-only MP4, normally holding AAC (or lossless ALAC). It is the native format of iTunes, Apple Music and iPhone Voice Memos and sounds better than MP3 at the same bitrate. It is best for Apple devices, iTunes and voice memos.

In short: keep WAV when the priority is editing, mastering, DAWs and archiving, and switch to M4A when the file is headed for Apple devices, iTunes and voice memos. Need a different target? The full Audio Converter supports every format listed below.

WAV to M4A FAQ

Lossless or lossy M4A?

Choose the ALAC codec for a lossless file, or AAC at 256 kbps for a much smaller file that sounds transparent.

Will the M4A sync to my iPhone?

Yes. Both AAC and ALAC M4A files import into Apple Music/iTunes and sync to iPhone and iPad.

Is this WAV to M4A converter free?

Yes. Converting WAV to M4A on MediaConverter.io is completely free, with no watermark, no sign-up and no daily conversion limit.

Are my WAV files uploaded to a server?

No. The converter runs inside your browser using WebAssembly and WebCodecs, so your .wav file is read and converted on your own device. Nothing is uploaded, which keeps private recordings private and means there is no waiting in an upload queue.

Is there a file size limit for WAV to M4A?

No fixed limit. Because processing happens locally, the practical limit is your computer's memory and patience; multi-gigabyte WAV files convert fine on a desktop browser. Very large files take longer on phones.

Will converting WAV to M4A reduce quality?

M4A is a lossy format, so the WAV audio is decoded and re-encoded. Keep the bitrate at 100% (or pick 256 to 320 kbps) and the difference is inaudible for almost all listeners.

Which browsers support the WAV to M4A converter?

Current versions of Chrome, Edge, Firefox and Safari on desktop all work. Chrome and Edge are fastest because they expose hardware-accelerated WebCodecs decoders.