Convert Core Audio Format (.caf) to WebM Video (.webm) 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 .webm file when it's ready.
CAF is Apple's professional audio container for macOS Core Audio. WebM is Google's open-source multimedia format for web content, supporting Opus and Vorbis audio. WebM is natively supported by Chrome, Firefox, Edge, and Android.
Converting CAF to WebM encodes the audio using Opus (the recommended WebM audio codec) for web distribution. From lossless CAF sources, the Opus encoder receives perfect PCM for optimal quality.
WebM with Opus delivers the best quality-per-bitrate of any web audio format. CAF files cannot be played in any web browser. Converting CAF to WebM/Opus creates efficient, universally compatible web audio from macOS professional sources.
For web developers, WebM is royalty-free and supported by all major browsers (except Safari, which has limited support). The conversion enables professional macOS recordings to reach web audiences.
FFmpeg reads the CAF container, decodes to PCM, and encodes using libopus into a WebM container. Opus supports 6-510 kbps with automatic speech/music detection. From lossless CAF sources, only one lossy step occurs. The WebM container uses Matroska EBML structure.
Opus at 128 kbps from lossless CAF sources produces transparent audio. From AAC-in-CAF, transcoding adds generation loss. Opus consistently outperforms AAC and Vorbis at every bitrate.
| Device | CAF | WebM |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| 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 WebM/Opus transforms macOS professional audio into the most efficient web format. Lossless sources produce optimal Opus quality.
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Quyền riêng tư là ưu tiên
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Hoạt động mọi nơi
Mọi trình duyệt, mọi thiết bị
| Native |
| Tính năng | CAF | WebM |
|---|---|---|
| Tên đầy đủ | Core Audio Format | WebM Video |
| Phần mở rộng | .caf | .webm |
| Phù hợp nhất cho | Apple native | Web optimized |