Private ffmpeg conversion
Convert M4A to MP3
Make MP3 copies of M4A voice memos, phone recordings, and iTunes-style audio for apps that prefer the most universal format. Re-encoding from one lossy format to another can lose a little quality.
Files
No files selected yet.About M4A and MP3 conversion
M4A is widely used by Apple apps, voice memo tools, and AAC audio exports, but some transcription systems, older players, and upload forms still ask for MP3. This pair is for compatibility when the available source is already an M4A file.
The converter decodes the M4A audio and writes a 192 kbps MP3. Many M4A files are already AAC, which is lossy, so this lossy-to-lossy conversion should be treated as a practical copy rather than a quality-preserving master.
For the first audio conversion in a session, the page loads the same-origin ffmpeg WebAssembly engine, about 31 MB, then keeps it ready for queued files. The M4A content stays local while the browser does the work.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a server. Close the tab and nothing is left behind. It even keeps working if you go offline after the page loads.
This is true for every tool on this site. Curious how that works? Read how browser-side processing works.
FAQ
When should I convert M4A to MP3?
Convert when a recorder, transcript service, player, or upload form accepts MP3 but rejects M4A.
Will M4A to MP3 reduce quality?
It can. Most M4A audio is already lossy AAC, and encoding that to MP3 adds another lossy generation.
Are voice memos sent to a server?
No. After the one-time ffmpeg.wasm engine download, conversion runs inside the browser on your device.