Convert any audio file to CAF format online for free. Fast, secure, and easy-to-use audio to CAF converter with no software installation required.
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Supported formats (Max 50MB, 30 min • Sign in for 200MB, 1 hr)
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Drag and drop your FLAC file or click to browse. Supports files up to 1GB.
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How the two formats differ on the things that change your result.
| Specification | FLAC (source) | CAF (result) |
|---|---|---|
| Container | FLAC | Core Audio Format |
| Developed by | Xiph.Org Foundation | Apple |
| Introduced | 2001 | 2005 |
| Audio codecs | FLAC | PCM, ALAC, AAC, Opus |
| Compression | Lossless (compressed) | Depends on codec |
| Max sample rate | 192 kHz | 192 kHz |
| Max bit depth | 24 bit | 32 bit |
| Max channels | 8 | 8 |
| Gapless playback | Yes | Yes |
| Metadata / tags | Vorbis comments | CAF metadata chunks |
| Approx. file size | 5–7 MB per minute | 1–32 MB per minute |
| Licensing | Royalty-free | Proprietary |
| Plays natively on | Native: Web browsers, Windows, macOS, iOS, Android · Needs a player: Smart TVs | Native: macOS, iOS · Needs a player: Windows, Web browsers |
| Best for | long-term archiving, audiophile listening, CD ripping | iOS development, the Apple ecosystem, very long recordings |
Core Audio Format is a container rather than a single codec, so what it holds depends on how the file was made. It can carry PCM, ALAC, AAC, Opus, which means two files with the same extension can differ in quality and size. Check the source before assuming which one you have.
Be aware that you are narrowing playback: FLAC is natively supported on 3 platforms where CAF is not. Convert this way when you need the format specifically, not for portability.
The two formats are aimed at different jobs. FLAC is typically used for long-term archiving, audiophile listening, CD ripping, while CAF is the usual pick for iOS development, the Apple ecosystem, very long recordings. That difference in intent is what most of the specification gaps above come from.
Expect metadata to be rewritten rather than copied: Vorbis comments in the source becomes CAF metadata chunks in the result. Standard fields map cleanly; niche custom tags often do not.
CAF is a proprietary format. It works well inside its own ecosystem but is less portable than the open format you are starting from.
This page converts FLAC files, stored in the FLAC container since 2001, into CAF, which uses Core Audio Format and dates from 2005. The differences between the two containers decide what changes in the result.
FLAC comes from Xiph.Org Foundation and dates to 2001. It carries FLAC, which is what determines the quality ceiling of anything you convert out of it.
CAF was introduced by Apple in 2005. It carries PCM, ALAC, AAC, Opus and has native playback on 2 of six platform categories, which is the practical reason to choose it as a target.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
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