What happens when you convert AAC to M4A
| Compression | Lossy → Lossy |
|---|---|
| Size per minute | AAC ≈ 1.4 MB → M4A ≈ 1.4 MB at 192 kbps |
| Quality | Re-encoded once more; at 192 kbps or higher the extra loss is very hard to hear |
| Tags | Title, artist and album tags are copied when the target format supports them |
| Opens in | Apple devices, Windows 10/11, Android and browsers |
Sizes are typical values; your files will vary with content and settings.
AAC Advanced Audio Coding
AAC is the successor to MP3 and the audio codec inside most MP4 videos, YouTube and Apple Music. A raw .aac file is an ADTS stream without a container.
AAC converterM4A MPEG-4 Audio
M4A is an MPEG-4 container holding AAC audio. iPhone voice memos, iTunes purchases and many recorders save M4A, and it sounds better than MP3 at the same bitrate.
M4A converterHow to use the AAC to M4A Converter
- 1
Choose a AAC file or drop it onto the page.
- 2
Review the audio options. The defaults suit most files.
- 3
Click Convert and download your M4A when processing finishes.
Why convert AAC to M4A?
Raw AAC files come from some phone recorders, internet radio streams and audio pulled out of videos. Raw .aac files have no chapter or cover-art support and some players skip them. Choose M4A for smaller files than MP3 at the same quality, played natively by Apple devices and modern players.
Frequently asked questions
Will the M4A lose quality?
Both formats are lossy, so converting re-encodes the data once more. Using a high quality setting keeps the generational loss very small. Avoid converting the same file back and forth repeatedly.
Will the M4A be smaller than the AAC?
About the same: a minute of audio takes about 1.4 MB as AAC and about 1.4 MB as M4A at 192 kbps. Lower the bitrate to shrink it further; 128 kbps is plenty for speech.
Questions about privacy, file-size limits or conversion speed are answered in the general FAQ.