Convert your .mp3 files to .m4a format online for free. No software to install. Fast, secure, and easy.
Pro account required for audio & video
Drag and drop your .mp3 file or click to browse.
Select M4A as your output format.
Click Convert and download your .m4a file.
Converting MP3 to M4A changes the container or codec while optimizing for your playback requirements. This is useful when your target device or application requires a specific audio format.
MP3 (MPEG Audio Layer III, introduced in 1993) uses Lossy (psychoacoustic model + MDCT) compression. M4A (MPEG-4 Audio, introduced in 2001) uses AAC (lossy) or ALAC (lossless) within MPEG-4 container compression. MP3 browser support: Universal. M4A browser support: All modern browsers (via AAC codec support).
Converting from MP3 (lossy) to M4A (lossless) will not recover quality that was lost during the original MP3 compression. The conversion preserves the current state of the file without further degradation. The resulting M4A file will be larger than the MP3 original.
Typical MP3 file size: A 4-minute song at 192 kbps: ~5.5 MB; at 320 kbps: ~9.2 MB. Typical M4A file size: A 4-minute song at 256 kbps AAC: ~7.3 MB; ALAC: ~25-35 MB.
For the best conversion results, always start from the highest quality source file available. Converting from a previously compressed file compounds any existing compression artifacts. When in doubt, use higher quality settings — you can always re-convert at lower quality later, but you cannot recover quality that has been lost.
Convert MP3 to M4A with 3 free conversions per day. No hidden fees.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion.
Convert files from any device — desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .m4a file maintains the best possible quality. No unnecessary compression or quality loss.
Audio conversion requires a Pro account. See pricing — starting at $4.99/month
You get 3 free conversions per day. Audio conversions require a Pro account.
Most files convert in under 10 seconds. Larger files may take a bit longer depending on size.
Yes. Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion. We never store your files.
Currently, SquishConvert converts one file at a time. Batch conversion is coming soon — stay tuned!
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.