WAV to M4A Converter
Upload a WAV file and get back an MP4-based .m4a with a native AAC-LC stream at the encoder's default rate, around 128 kbps for stereo. The rate is fixed and AAC is lossy, so there is no setting that makes the M4A a lossless copy of the WAV.
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Why convert WAV to M4A
WAV is uncompressed PCM in a RIFF container. That is what you want while recording or editing, and what you do not want on a phone: CD-quality stereo runs at roughly 10 MB per minute, so a handful of mixes fills a device. WAV also has no widely respected tagging system, so music libraries often show file names instead of artist and album. M4A solves both: the same audio takes a fraction of the space, and the MP4 container has proper fields for title, artist, album and chapter marks.
On MiConvert the job runs on our servers with ffmpeg 5.1.9. The WAV is decoded to PCM and re-encoded with ffmpeg's native AAC-LC encoder, then written through the ipod muxer so the output reports the M4A major brand that Apple players look for. No bitrate is requested, so the encoder uses its own default: about 128 kbps for a stereo track and about 69 kbps for mono. There are no filters in the chain, meaning no normalization, no noise reduction and no resampling request.
What survives: the source sample rate, so a 48 kHz or 96 kHz master is not downsampled, and the channel count, including multichannel sources. Title, artist and album tags carry over when the WAV actually contains them, but most recorder and DAW exports hold nothing but audio, so you will usually tag the M4A afterwards in your player. What is lost: every picture stream, so embedded artwork does not come through, and the PCM precision itself. A 24-bit WAV is not kept at 24 bits, because AAC is lossy and bit depth stops being a property of the file.
This pair fits people exporting a mix or a voice recording for a phone, building a library for iTunes or an iPhone, or emailing a recording that is too large as WAV. It works in any browser on Mac, Windows or Linux, which is why people search for an online converter rather than an Audacity or ffmpeg command.
How to convert WAV to M4A
- Check the file size before you start. WAV grows fast: the per-file ceiling is 50 MB without an account, 100 MB with a free account, 200 MB on Plus and 1 GB on Pro.
- Make sure the extension is .wav. The converter recognizes files by extension first, and spellings like .wave are not on the accepted list.
- Drag the file onto the page, or click to browse. You can add several files in one request (up to 10 for guests, 25 on Plus, 50 on Pro) and each one is converted on its own.
- Start the conversion. There are no quality, bitrate or sample-rate options to set, because the AAC-LC settings are fixed for every file.
- Download the result. Each output keeps the original base name with an .m4a extension, and the download link stays valid for about four hours.
What this converter actually does
- Encodes with ffmpeg's native AAC-LC encoder and writes the file through the ipod muxer, so the container carries the M4A brand Apple software expects
- Uses the encoder default bitrate: roughly 128 kbps for stereo input, around 69 kbps for mono
- Keeps the source sample rate instead of forcing everything to 44.1 kHz, and keeps the channel count of the source
- Carries over title, artist and album tags and chapter marks when the WAV contains them
- Converts up to 10 files per request (25 on Plus, 50 on Pro), each output named after its original file
- Runs entirely on our servers, so a 36 MB WAV is handled the same on a phone as on a desktop; typical files finish within a few seconds of the upload completing
Video Tutorial
Watch this step-by-step tutorial to learn how to convert WAV files to M4A format online for free using MiConvert.com. No software installation required.
Frequently asked questions
Can I get a lossless M4A, like ALAC?
No. This converter writes AAC-LC only. We can read Apple Lossless when it arrives inside an .m4a file, but there is no ALAC encoder installed, so we cannot produce one. If you need a lossless file that is smaller than WAV, convert to FLAC instead, which keeps bit depth and sample rate and up to 8 channels.
Can I choose the bitrate or the quality?
No. The audio converter has no quality selector; the AAC-LC encoder default is applied to every file. If you need a specific target such as 256 kbps, use a desktop tool where you can pass the bitrate yourself.
Will the file play in iTunes, Apple Music and on my iPhone?
Yes. The output is an MP4 audio file with the M4A brand and an AAC-LC stream, which is what Apple players read natively. You still have to add it to your library yourself; converting does not sync anything.
Does album artwork come through?
No. All picture streams are dropped during conversion, so embedded artwork in a WAV does not reach the M4A. Add the cover in your player's track info panel after importing.
What is the equivalent ffmpeg command?
Close to ffmpeg -i input.wav -vn -c:a aac -f ipod output.m4a. We add no bitrate flag, no filters and no trimming, which is why the result matches the encoder's default behavior rather than a tuned preset.
My WAV is larger than the limit. What now?
A free account raises the per-file ceiling to 100 MB, Plus to 200 MB and Pro to 1 GB. For a single file above 1 GB and up to 40 GB, audio is eligible for the pay-once large-file conversion: you sign in, pay a one-time fee, and the finished file arrives as an emailed link that is valid for five days.
The page said "Processing timeout" but I still want the file.
The browser stops waiting after a few minutes while the server allows up to 30 minutes per file, so a long recording can still finish after the page gives up. Reload later, or sign in and tick "Email me when conversion is done" before starting.
What happens to my files?
Conversion happens on our servers, not in your browser. The uploaded WAV is deleted as soon as the job finishes, and the M4A can be downloaded for about four hours before it is deleted automatically. File names, sizes and outcomes are logged for operations, and signed-in accounts keep a conversion history row.