M4A to MP3
Your files never leave your browser. Nothing is uploaded to any server.
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Files
Settings apply to every file. Set start and end to keep only part of a file.
Simple audio tools that respect your files
Every tool on SnipAudio works the same way: pick a file, adjust, download.
Runs in your browser This page opens and processes your file on your own device. Nothing is uploaded, so there is no upload to wait for and no copy on a server.
Free, with no sign-up No account, no email and no watermark. Use it as often as you like; the only limit is your device’s memory.
Works on your phone Open the page in your phone’s browser. There is no app to install, and the buttons are sized for fingers.
How to convert M4A to MP3
- Drop one or more M4A files into the box above, or tap Choose M4A files.
- Pick MP3 or WAV, a bitrate and a sample rate. Change the volume if the file is too quiet or too loud.
- To keep only part of a file, type a start and end time in seconds.
- Press Convert, then Download next to each file.
Continue with the next audio task
Ready to convert your M4A files?
Your file opens right here in the browser and never leaves your device.
M4A to MP3 converter FAQ
Something not covered here? Email hello@snipaudio.com.
Are my files uploaded?
No. Your browser decodes the M4A and encodes the MP3 on your device. From this site, your browser downloads only this page, its four scripts and the small site icon. The page also loads Google Analytics, which counts visits and never receives your audio.
Do I need an account to download?
No. There is no sign-up or login on this site. The download button saves the converted file straight from your browser.
Which bitrates and sample rates can I choose?
MP3 at 128, 160, 192, 256 or 320 kbps, at 44.1 kHz or 48 kHz. WAV is 16-bit at the same two sample rates. Mono files stay mono and stereo files stay stereo. Files with more than two channels are mixed down to stereo.
Which M4A files work?
M4A files with AAC audio. Apple Lossless (ALAC) M4A files did not decode in the Chromium browser we tested with. If your browser can't decode a file, the page tells you. People often type the name as MA4 or MP4A: M4A is the file extension, and mp4a is the name the MP4 format gives to the AAC audio inside it, so all three mean the same kind of file.
Does converting M4A to MP3 lose quality?
AAC and MP3 are both lossy formats, so converting from one to the other can't add back detail that was already removed. A higher bitrate keeps more of what is left, and gives a larger file.
Are song titles and cover art kept?
Yes. Title, artist, album, album artist, year, track number, genre and the cover image are copied into the MP3 as an ID3v2.3 tag. If you pick WAV, they go into the WAV as LIST INFO text tags and an id3 chunk that also holds the cover. Other fields, such as lyrics and comments, are not copied. We converted tagged test files and read the results back with FFmpeg and Mutagen: every field and the cover image matched the original.
Why is the MP3 a little longer than the M4A?
MP3 encoding pads the audio to whole frames, so the MP3 comes out a few hundredths of a second longer. WAV keeps the exact length.
Is there a limit on file size or number of files?
This page sets none, but your device does. Each file is decoded into memory while it converts. On our test computer, with about 3 GB of free memory, a 45-minute M4A converted and a 60-minute M4A crashed the browser tab while decoding. Converting takes time too: a 10-minute file took about a minute there. Files are converted one after another.