Convert a CAF file (Apple Core Audio Format, often from GarageBand or iOS voice memos) to MP3 locally in your browser. No upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
CAF (Core Audio Format) is Apple's own container, introduced with Mac OS X Tiger - more flexible than AIFF, because it can hold nearly any codec (PCM, AAC, ALAC and more) as well as very long recordings without the old size limits of older formats. GarageBand, Logic Pro and the iOS Voice Memos app use CAF regularly; outside the Apple ecosystem, hardly any program knows it.
The tool demuxes the CAF container and decodes the contained codec (usually PCM or AAC) natively with ffmpeg, before encoding the result with libmp3lame to MP3. That makes an iPhone voice memo or a GarageBand export playable on any device.
Since CAF can be lossless or lossy depending on the contained codec, the sensible bitrate value depends on the source - a plain voice memo needs less, a music mix more headroom. Everything runs locally in the browser.
| Input formats | CAF |
|---|---|
| Output format | MP3 |
| Batch processing | No |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: MP3 is lossy - for an already-lossless CAF (e.g. with PCM content), the conversion means a real step down in quality. One file per run.
No, the conversion runs entirely locally in the browser.
Usually from the iOS Voice Memos app, GarageBand or Logic Pro exports.
CAF is an Apple-proprietary container without broad support outside macOS/iOS.
If the CAF file contains PCM or another lossless format, yes - MP3 itself is lossy.