Change AAC audio to M4A for any player or device, with the bitrate, sample rate and channels you choose. Free, with no upload.
Drop audio or video files here
or paste them, or click to choose — several files at once
Choose filesMP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF, WMA, APE, AMR, MP4 and more · up to 300 MB per file
The converter (about 30 MB) is downloaded once on first use and then cached. Your files never leave your device.
Drop AAC files onto the converter, paste them, or click to choose. You can add many at once.
M4A is already selected. If you like, adjust the quality, sample rate or channels before or after adding files.
Each file is converted in your browser in seconds. Save them one by one, or all at once as a ZIP.
Advanced Audio Coding
Efficient successor to MP3
AAC (Advanced Audio Coding) was designed to replace MP3 and is used by YouTube, Apple and digital radio. An .aac file is a raw AAC stream without an MP4 container.
MPEG-4 Audio
Apple's everyday music format
M4A is an MPEG-4 audio file, usually containing AAC. It is the standard format of Apple Music, iTunes and the iPhone Voice Memos app.
Audio is converted by ffmpeg running inside your browser. Your files never reach a server.
Queue up to 50 files and download them one by one or together as a ZIP.
Set the bitrate, bit depth, sample rate and channels — or simply keep the sensible defaults.
Add your AAC files to the converter above. M4A is already selected as the output, so conversion starts right away. When a file is ready, click Download, or use Download all to get a ZIP.
Both formats are lossy, so re-encoding adds a little loss. Choose a bitrate equal to or higher than the original (for example 192–256 kbps) and the difference will be inaudible.
AAC at 192 kbps sounds as good as MP3 at 256 kbps. Use 256 kbps for Apple Music quality, or 96–128 kbps for audiobooks and podcasts.
No. The AAC to M4A conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your files are never sent to a server, so even private recordings stay on your device.
Yes. Add up to 50 files; they are converted one after another, and you can download each M4A file separately or all of them together as a ZIP archive.