Convert CAF to OGA — Free Online Tool
Convert CAF audio files to OGA format using Vorbis encoding, transforming Apple's proprietary Core Audio container into an open, royalty-free Ogg container compatible with Linux, web players, and open-source media tools. The conversion transcodes the audio stream to libvorbis at quality level 4, producing a well-balanced lossy output that works across platforms without Apple ecosystem dependencies.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your CAF file here
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
CAF files can contain a variety of audio codecs — most commonly PCM (uncompressed), AAC, or FLAC — so conversion to OGA is not a simple remux; it requires full audio decoding and re-encoding. FFmpeg first decodes whatever codec is inside your CAF container to raw PCM, then re-encodes that audio using the libvorbis encoder (the reference Ogg Vorbis implementation) and wraps the result in an Ogg container with the .oga extension. Quality level 4 (-q:a 4) targets approximately 128–160 kbps variable bitrate, which preserves most perceptible audio detail for music and voice while producing a file significantly smaller than uncompressed CAF. Because Vorbis is inherently lossy, any lossless source inside the CAF (such as PCM or FLAC) will be converted to a lossy output — there is a one-way quality tradeoff involved.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, the open-source multimedia processing engine that handles decoding the CAF container and re-encoding its audio to Vorbis for the OGA output. |
-i input.caf
|
Specifies the input file as a CAF (Core Audio Format) file. FFmpeg will detect the container format and identify the internal audio codec (commonly PCM, AAC, or FLAC) to determine how to decode it. |
-c:a libvorbis
|
Selects the libvorbis encoder for the audio stream, which encodes the decoded audio into Ogg Vorbis format — the only lossy audio codec natively supported in the OGA container and the default choice for broad compatibility. |
-q:a 4
|
Sets the Vorbis variable bitrate quality to level 4 on a scale of 0–10, targeting approximately 128–160 kbps. This is the recommended balanced setting that delivers good perceptual fidelity for both music and voice without excessive file size. |
output.oga
|
Defines the output filename with the .oga extension, which signals to FFmpeg to wrap the encoded Vorbis stream in an Ogg container specifically designated for audio-only content, as distinguished from .ogg which may contain video. |
Common Use Cases
- Sharing Apple GarageBand or Logic Pro audio exports with collaborators on Linux or Windows who cannot open CAF files natively
- Embedding audio recorded on macOS into web pages using the HTML5 <audio> element, where OGA/Vorbis is supported by Firefox and Chromium-based browsers
- Migrating a sound effects library originally authored in Core Audio Format to an open archival format that does not depend on Apple software to decode
- Publishing podcast episodes or voice memos recorded on an iPhone (saved as CAF) to platforms that accept Ogg Vorbis uploads
- Converting CAF audio assets from an iOS game or app for use in a cross-platform game engine like Godot or pygame, which natively support Ogg Vorbis
- Stripping Apple ecosystem dependency from audio deliverables before uploading to open-source collaborative projects or repositories
Frequently Asked Questions
Yes — since OGA with libvorbis is a lossy format, converting uncompressed PCM audio from a CAF file will introduce a degree of lossy compression. At quality level 4 (the default), libvorbis targets roughly 128–160 kbps variable bitrate, which is transparent for most listening scenarios but is not bit-for-bit identical to the original. If you need lossless output in an Ogg container, you should instead encode to FLAC inside OGA (using -c:a flac), which preserves all audio data exactly.
Yes. Unlike container-swap conversions where a codec can be copied directly, OGA does not support AAC streams — it only supports Vorbis, Opus, or FLAC. FFmpeg will fully decode the AAC stream to uncompressed PCM internally, then re-encode it to Vorbis. This means the audio passes through two lossy encoding stages (AAC → PCM → Vorbis), which can compound quality degradation slightly, so use the highest practical quality setting if your source is AAC-encoded.
FFmpeg will attempt to map standard metadata tags from the CAF container to Ogg Vorbis comment tags, and common fields like title, artist, and album are typically carried over. However, CAF supports some Apple-specific metadata structures that have no direct equivalent in the Vorbis comment format, so those fields may be silently dropped. You should verify your tags in the output file using a tool like MediaInfo or a tag editor such as MusicBrainz Picard.
Adjust the -q:a value to control Vorbis quality. The scale runs from 0 (lowest quality, smallest file, roughly 64 kbps) to 10 (highest quality, largest file, roughly 500 kbps). For example, use -q:a 6 for higher fidelity music or -q:a 2 for voice content where file size matters more. Unlike the -b:a bitrate flag, Vorbis -q:a uses variable bitrate encoding, so the actual file size will vary depending on the complexity of your audio content.
Yes. Replace -c:a libvorbis -q:a 4 with -c:a flac in the FFmpeg command, and the output will be a lossless FLAC stream inside an Ogg container. This is ideal when your CAF contains PCM or FLAC audio and you want to preserve full fidelity. Note that the -q:a flag does not apply to FLAC in this context, as FLAC is inherently lossless and only offers compression level settings via -compression_level.
The single-file command shown here handles one file at a time, but you can batch process in a shell loop. On Linux or macOS, run: for f in *.caf; do ffmpeg -i "$f" -c:a libvorbis -q:a 4 "${f%.caf}.oga"; done. On Windows PowerShell, use: Get-ChildItem *.caf | ForEach-Object { ffmpeg -i $_.FullName -c:a libvorbis -q:a 4 ($_.BaseName + '.oga') }. This is particularly useful for converting large sound libraries exported from macOS DAWs.
Technical Notes
CAF (Core Audio Format) was designed by Apple to remove the 4 GB file size ceiling of WAV and AIFF, and it supports a wide range of internal codecs including PCM variants (s16, s24, s32, float), AAC, FLAC, Opus, and Vorbis. OGA is strictly an audio-only Ogg container and only supports three codecs: libvorbis, FLAC, and Opus. This means CAF-to-OGA conversion always requires a full decode-and-reencode pass regardless of what codec is inside the source file. The libvorbis encoder used here is the reference implementation and produces excellent quality at q:a 4, though the Opus codec (selectable via -c:a libopus) generally outperforms Vorbis at lower bitrates if your target player supports it. One known limitation is that CAF's multi-channel audio layouts (such as 5.1 surround used in some Apple game assets) may need explicit channel mapping flags when targeting OGA, as Ogg Vorbis has its own channel ordering convention. CAF files exceeding 1 GB — possible given the format's large-file design goals — cannot be processed in this browser tool, but the displayed FFmpeg command can be run locally on the desktop without size restrictions.