Convert Core Audio Format (.caf) to 3GPP Multimedia (.3gp) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .caf file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .3gp file when it's ready.
CAF (Core Audio Format) is Apple's flexible audio container, introduced in macOS Tiger (10.4) as part of the Core Audio framework. CAF supports any audio codec (PCM, AAC, ALAC, IMA4, Opus, and more), has no file size limit (unlike WAV's 4 GB cap), and stores rich metadata including channel layouts, markers, and regions. CAF is the native format for Logic Pro recording sessions and macOS audio workflows.
Converting CAF to 3GP re-encodes the audio into a lightweight mobile container using AMR or low-bitrate AAC. This bridges professional macOS audio with legacy mobile infrastructure, enabling playback on older feature phones and compatibility with MMS gateways.
CAF files are a macOS-specific format with virtually no support outside Apple's ecosystem. Feature phones, MMS gateways, and telecom systems cannot process CAF. Converting to 3GP makes your macOS-recorded audio accessible to constrained mobile environments.
The conversion is particularly relevant for voice memos and field recordings captured on Mac hardware that need to be delivered through mobile channels with strict format and size requirements.
FFmpeg reads the CAF container header to identify the enclosed audio codec (PCM, AAC, ALAC, IMA4, etc.), decodes to PCM, then transcodes to AMR-NB (8 kHz mono), AMR-WB (16 kHz mono), or AAC-LC within a 3GP container. CAF's flexible codec support means the decode step varies — PCM is direct, ALAC is lossless decoded, AAC requires full decode-reencode. The output conforms to 3GPP TS 26.244.
Quality depends on the CAF source codec. If CAF contains PCM or ALAC (lossless), the 3GP output benefits from perfect source material. If CAF contains AAC, the transcoding introduces generation loss. AMR-NB is narrowband (300-3400 Hz) for speech only. AAC-LC at 64 kbps in 3GP provides the best quality option.
| Device | CAF | 3GP |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
CAF to 3GP bridges macOS professional audio with legacy mobile infrastructure. The output quality depends on both the source codec within CAF and the chosen 3GP codec.
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| No |
| Ominaisuus | CAF | 3GP |
|---|---|---|
| Koko nimi | Core Audio Format | 3GPP Multimedia |
| Tiedostopääte | .caf | .3gp |
| Paras käyttökohde | Apple native | Mobile optimized |