AAC to MP4
Wraps AAC audio into an MP4 container without re-compressing it, right in your browser.
Drop an AAC file here
Everything happens on your device — your files are never uploaded.
file.aac
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Converting…
Done
How it works
- 1 Drop your AAC or ADTS file or pick it from your device.
- 2 Click Convert to MP4 and watch the progress bar as it wraps the audio.
- 3 Download your MP4. It never leaves your browser.
Built with open source
- Mediabunny — Converts and edits video and audio in the browser via WebCodecs. Add-on encoders cover MP3, AAC, and FLAC. · MPL-2.0
Frequently asked
What exactly does this produce? +
An audio-only MP4 container with a single AAC track inside. Raw AAC and ADTS streams get repackaged into a proper MP4 box that pretty much every player and editor accepts.
Is the audio re-compressed? +
Yes. The audio is re-encoded as AAC into the MP4 at a high bitrate. Chrome and Edge encode AAC natively. Firefox and Safari load a small AAC encoder the first time you use it.
Does my file get uploaded? +
No. Everything runs in your browser with WebCodecs, so your audio never leaves your device.