Convert your .m4a files to .aac format online for free. No software to install. Fast, secure, and easy.
Pro account required for audio & video
Drag and drop your .m4a file or click to browse.
Select AAC as your output format.
Click Convert and download your .aac file.
M4A preserves your audio at full quality, but the large file sizes make it impractical for sharing or mobile playback. Converting to AAC compresses the audio to a fraction of the size while maintaining quality that is virtually indistinguishable from the original at moderate bitrates.
M4A (MPEG-4 Audio, introduced in 2001) uses AAC (lossy) or ALAC (lossless) within MPEG-4 container compression. AAC (Advanced Audio Coding, introduced in 1997) uses Lossy (MDCT-based with TNS and PNS tools) compression. M4A browser support: All modern browsers (via AAC codec support). AAC browser support: Universal.
The quality impact depends on the specific settings used during conversion. AAC uses compression that may affect quality depending on the chosen settings.
Typical M4A file size: A 4-minute song at 256 kbps AAC: ~7.3 MB; ALAC: ~25-35 MB. Typical AAC file size: A 4-minute song at 256 kbps AAC-LC: ~7.3 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 M4A to AAC 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 .aac 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.