Compress M4A Online — Reduce File Size by Up to 20-60%
Compress M4A files online instantly. Reduce .m4a file size by 20-60% with no quality loss. Batch compress 100+ files. No signup, no watermarks.
Batch Settings
About M4A Compression
M4A is essentially an AAC audio file inside an MPEG-4 container — the format Apple uses for iTunes purchases and Apple Music downloads. M4A files are already well-compressed, but re-encoding at a lower bitrate provides further savings.
CocoConvert adjusts the AAC encoding bitrate while keeping the M4A container intact. For voice recordings (which iPhones save as M4A), dropping from 256kbps to 128kbps halves the file size with no audible difference.
For music, 192kbps M4A provides transparent quality. For audiobooks and podcasts, 64-96kbps is ideal.
All metadata (artist, album, cover art) can be optionally stripped for additional size reduction.
How to Compress M4A
- 1
Upload your M4A file
Drag and drop your .m4a file into the upload area, or click to browse. Batch upload is supported.
- 2
Adjust compression settings
Use the quality slider to control the compression level. Lower values produce smaller files.
- 3
Click "Compress"
CocoConvert compresses your M4A file using optimised audio encoding.
- 4
Download the compressed M4A
Your smaller .m4a file is ready. Typical reduction: 20-60%.
Compression Tips
M4A
.m4a file • Audio
Lower bitrate to 128kbps for podcasts and voice.
| Extension | .m4a |
| MIME Type | audio/mp4 |
| Category | Audio |
Frequently Asked Questions
What are the limits for M4A compression?
CocoConvert lets you compress M4A files with no signup required. You get 5 files per hour (up to 250 MB each) on the starter tier. Pro users get 100 files per hour and 5 GB per file.
How much can I reduce M4A file size?
Typical M4A compression reduces file size by 20-60%, depending on the original file and quality settings. Tip: 128kbps for voice, 192kbps for music.
Does compression affect M4A quality?
CocoConvert gives you full control over the quality-size trade-off. Higher quality settings preserve more detail; lower settings produce smaller files. For lossless formats, compression is always bit-for-bit identical.
Is my M4A file secure?
Absolutely. Files are processed on isolated servers in Germany, encrypted in transit via TLS, never analysed or shared, and permanently deleted within 24 hours.
Can I batch compress multiple M4A files?
Yes! You can compress up to 5 files per hour on the starter tier. Pro users get 100 files, Business API users get 200. All files are processed in parallel.