MP3
MP3 is a compact, widely supported audio format suited to music, speech and everyday sharing.
Open MP3 ConverterMP3 to M4A Converter
Convert MP3 to M4A online in your browser in batches of up to 100 files. Review the result and download it without uploading the source.
Drop audio files hereProcessed locally in your browser
No upload
AVAILABLE CONVERTERS
About MP3 and M4A
Learn about the source and output formats used in this MP3 to M4A conversion.
M4A
M4A is a modern audio container commonly used for efficient music and voice recordings.
Open M4A ConverterInputMP3
OutputM4A
Best forrecordings, music and sound effects
Related Tools
All Audio toolsAbout this tool
About MP3 to M4A
Make an M4A copy when a music library, phone application or publishing system requests AAC audio in an MP4-family container. Keep the MP3 if it already meets the destination's requirements: changing formats is not an automatic quality upgrade.
M4A output here is AAC-LC, not ALAC
M4A names a container rather than a promise of lossless sound. This converter encodes AAC-LC audio and packages it as .m4a. It does not offer an ALAC option.
The MP3 to AAC page uses a different package: an ADTS .aac stream. A receiver asking for .m4a may not accept that raw-stream alternative. Choose by the application's container requirement, not only the codec name.
Current encoding preset
The current M4A page uses its preset AAC encoding bitrate rather than exposing a bitrate selector. Test a short representative file: transcoding can introduce audible artifacts and cannot recover detail discarded by MP3.
No channel or sample-rate selector is exposed on this page. After downloading, inspect the actual duration and channels rather than assuming a specific output profile beyond the documented codec and container.
Conversion steps
- Add a compatible MP3 and confirm the M4A output direction.
- Review the output direction; this page uses a fixed encoding preset.
- Start conversion and wait for the browser engine.
- Download the M4A and open it in the receiving player or library.
- Check audio, duration, seeking and any metadata important to your use.
Artwork, chapters and tags are not guaranteed to survive completely. Keep the original until the file has been tested, especially if the library depends on those properties.
Multiple files and failed items
The queue accepts up to 100 files, each under 150 MB and no more than 500 MB combined. Processing is sequential. Failures are listed and remaining files continue; successful outputs can be saved as one ZIP or individual files. A single success downloads directly as M4A.
Compatible processing stays on your device. Network requests load the application and engine, while decoded audio can still require substantially more memory than the compressed source.
When a different format is better
Retain MP3 for a destination that already supports it. Use MP3 to WAV if an editor specifically needs PCM audio; conversion still cannot reconstruct the original recording. See MP3 vs WAV for working-copy and delivery-copy tradeoffs.
Three simple steps
How it works
- 1Choose
Add a supported file or paste your content.
- 2Process
The tool works locally in your browser when supported.
- 3Download
Save the result directly to your device.
Frequently asked questions
MP3 to M4A FAQ
Which codec is inside the M4A output?
This tool writes AAC-LC audio into an MP4-family M4A container. It does not produce ALAC lossless audio.
Is M4A the same output as .aac?
No. Here M4A packages AAC audio in a container, while the separate AAC output uses an ADTS audio stream. Choose the packaging required by your application.
Can I select a bitrate on this page?
No. The current M4A converter uses its preset AAC bitrate and does not show a bitrate selector. The conversion cannot restore information already lost from an MP3.
Does conversion preserve artwork and tags?
Do not assume complete preservation of artwork, chapters, tags or other metadata. Check the downloaded M4A in the library or player where it will be used.
How does a batch handle errors?
Files run sequentially. A failure is listed and the remaining files continue. Up to 100 files are accepted, each under 150 MB, with a 500 MB combined limit.
How do I save the result?
Download one M4A directly or choose ZIP or individual files for multiple successes. This is a file download, not a text-copy operation.