WHAT CHANGES
M4A input, MP3 output
Formatify decodes the source and creates a fresh MP3 file. Quality and file size can change because the formats store audio data differently.
LOCAL AUDIO CONVERSION
M4A → MP3
Convert M4A audio to a broadly compatible MP3. The conversion engine runs on your device, so your file does not need to be uploaded to Formatify.
PRIVACY
Your file stays in the browser
The self-hosted conversion code runs locally. Closing the tab clears the working data kept by the page.