CAF to FSSD Converter

Turn your CAF recordings into FSSD format online

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Bulk Conversion

Convert an entire folder of CAF recordings to FSSD at once. Just upload all files and let the batch converter handle the rest.

Server-Side Processing

All CAF to FSSD encoding runs in the cloud. Your computer or phone handles nothing — just upload and wait.

Intuitive Process

The CAF to FSSD converter is designed for simplicity. Upload, convert, download — done in under a minute.

How to convert CAF to FSSD

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose fssd or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your fssd file right afterwards

About formats

CAF (Core Audio Format) is a flexible audio container developed by Apple and introduced with Mac OS X 10.4 Tiger in 2005. Built to overcome limitations of older formats, CAF eliminates the 4 GB file size ceiling that constrains WAV and AIFF, theoretically supporting unlimited length. The container accommodates virtually any codec — AAC, ALAC, MP3, linear PCM, IMA ADPCM, and more — within a unified wrapper. Its chunk-based architecture stores audio alongside rich metadata including channel layouts, marker regions, annotations, and MIDI data. A defining advantage is handling extremely long recordings: broadcasters and field recordists can capture hours of continuous audio without size boundaries. Flexible codec support is another strength, as one container works whether the content is high-resolution 24-bit/192 kHz lossless audio or compressed speech. Apple's Core Audio framework provides native support on macOS and iOS, ensuring low-latency playback in professional applications like Logic Pro and Final Cut Pro. For Apple ecosystem workflows requiring both versatility and scale, CAF is an exceptionally capable choice.
Developer: Apple Inc.
Initial release: 2005
FSSD is a raw audio format that originated in the classic Macintosh ecosystem, where Farallon Computing's MacRecorder hardware (1988) stored digitized sound as unsigned 8-bit PCM in resource fork entries tagged with the 'FSSD' type code. In modern audio processing tools such as SoX, FSSD is treated as an alias for the u8 (unsigned 8-bit) raw format — headerless files containing a flat stream of single-byte amplitude samples, where each value from 0 to 255 represents an audio level with 128 as the center point. Because there is no header, playback parameters like sample rate and channel count must be provided externally. The original MacRecorder typically captured at rates up to 22 kHz in mono, though any sample rate is valid when interpreting the raw data. FSSD and its compressed companion format HCOM (which adds Huffman compression to the same underlying data) were the standard audio formats for early Mac multimedia: HyperCard stacks, educational CD-ROMs, and system alert sounds of the late 1980s and early 1990s relied heavily on this encoding. One advantage of the raw FSSD format is trivial parseability — with no container overhead, the audio data begins at byte zero and can be read by any tool capable of processing unsigned 8-bit PCM. The format's historical significance also makes it practically relevant for digital archivists: converting FSSD recordings to modern containers like WAV preserves the original audio content losslessly, since the raw samples only need a header prepended, not any form of transcoding.
Developer: Farallon Computing
Initial release: 1988

Frequently Asked Questions

Why convert CAF to FSSD?

CAF files can be difficult to share with non-Mac users. FSSD ensures universal access to your audio content.

What programs can open FSSD?

Open FSSD with SoX, Audacity, classic Mac audio tools. These applications provide full playback and editing support for the format.

Is the CAF to FSSD conversion lossless?

That depends on the FSSD codec. Lossless formats keep every sample intact, while lossy ones reduce data for smaller output sizes.

Can I convert several CAF recordings at once?

Yes — upload multiple CAF files simultaneously and convert them all to FSSD in a single batch. No need to process one at a time.

Is the CAF to FSSD conversion secure?

Completely. Your CAF files are erased immediately after processing, and converted FSSD results are purged from our servers within 24 hours.

Do I need to install anything?

No installation needed. The CAF to FSSD converter is fully browser-based — open the page, upload your audio, and download the result.