Convert AAC to M4A online. AAC and M4A both use lossy compression. Free batch processing with no signup or watermark.
Drop or click to add one or more audio files
Add one or more AAC files. You can review the complete batch before processing it.
M4A is already selected for this page. Add multiple audio files and use the available codec, trim, volume, fade and reverse controls.
Start the batch, then download and check the finished M4A file or files.
AAC and M4A both use lossy compression. Re-encoding may introduce a small additional quality loss, especially in audio that has already been compressed several times.
AAC (Advanced Audio Coding) is the successor to MP3, delivering better sound at the same file size. It is the default for Apple Music, YouTube and most streaming services, and is supported across virtually all modern devices.
AAC plays in Apple Music/iTunes, QuickTime, VLC and on nearly all modern phones, browsers and players.
M4A is an audio format that usually holds AAC-encoded sound in an MP4 container. It is Apple’s standard for music downloads and voice memos, offering great quality at small sizes and playing natively across the Apple ecosystem.
M4A plays in Apple Music/iTunes, QuickTime, VLC and most modern media players; on older devices, convert it to MP3.
ToolSpice can convert your AAC files to these other formats:
These other formats can be converted to M4A on ToolSpice: