MP3 to M4A Converter
Convert MP3 to M4A locally in your browser, powered by Mediabunny and native WebCodecs — nothing is ever uploaded. Drop a MP3 file below to get started.
Drop files, or click to browse
MP3 files only — processed one at a time
Frequently asked questions
Is this MP3 to M4A converter free?+
Yes, with no watermark, no account, and no daily limit.
Is my audio file uploaded anywhere?+
No — conversion runs locally using your browser's own built-in media codecs, entirely inside your browser tab.
Will I lose audio quality?+
Converting between compressed formats can lose a small amount of quality; converting to a lossless format like WAV or FLAC won't.
Is there a maximum file size?+
There's no fixed file-size limit since nothing is uploaded to a server. Processing time scales with the track's length rather than a hard cutoff.
How do I convert MP3 to M4A?+
Drop your MP3 file into the box above — it's decoded and re-encoded as M4A automatically, with a download ready in seconds.
About MP3 and M4A
What is MP3?
MP3 is the format that made digital music mainstream — lossy compression that plays back on essentially every device made in the last 25 years.
Full MP3 format guide →What is M4A?
M4A is an audio-only MPEG-4 container, most often holding AAC audio — it's what Apple Music and Voice Memos save by default.
Full M4A format guide →The short version: M4A gives you good compression efficiency, which helps once you run into MP3's biggest limitation: lossy — some audio detail is discarded permanently. It's a natural move when your audio is headed toward voice memos and Apple Music downloads.
How it works
- 1
Drop your file in
Drag your audio onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Pick your settings
The output format is already set for this page — just adjust any extra options shown, if there are any.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your audio is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Voice memos and Apple Music downloads
- Podcasts
- Prepping a podcast episode for a hosting platform
- Fitting a voice memo under a messaging app's size limit
Supported formats
This is one of many pairings the audio toolkit handles. In total it covers:
Related conversions
Format details
About MP3 files+
MP3 is the format that made digital music mainstream — lossy compression that plays back on essentially every device made in the last 25 years.
MP3 (MPEG-1 Audio Layer III) was developed by the Fraunhofer Institute and standardized as part of MPEG in the early 1990s, and it became the format that made portable digital music practical in the first place — shrinking a CD-quality track down to roughly a tenth of its uncompressed size by discarding audio detail the human ear is least sensitive to. Decades later, despite the rise of more efficient codecs like AAC and Opus, MP3 remains the safest choice whenever compatibility is the priority, since there's essentially no device or piece of software made in the last two decades that can't play it.
How to open a MP3 file
Opens readily in Any media player, Any web browser, Every phone and car stereo made in the last two decades. For real editing, use Audacity (free), Adobe Audition.
Good for
- universal playback support
- small files at a reasonable bitrate
Watch out for
- lossy — some audio detail is discarded permanently
About M4A files+
M4A is an audio-only MPEG-4 container, most often holding AAC audio — it's what Apple Music and Voice Memos save by default.
M4A is essentially an MPEG-4 container that's been restricted to audio only, and it's the extension Apple uses by default across iTunes downloads, Apple Music, GarageBand, and Voice Memos. In almost every practical case it holds AAC-encoded audio, so its quality and compression characteristics are effectively the same as AAC — it's really a matter of which extension a given piece of Apple software happened to save the file with.
How to open a M4A file
Opens readily in Any modern media player, iTunes/Apple Music, Most web browsers. For real editing, use Audacity (free), GarageBand.
Good for
- good compression efficiency
- native format across Apple apps
Watch out for
- occasionally needs converting for apps that only expect MP3
Need a different format? Try the full Audio Converter, or explore all audio tools.