3GP to FSSD Converter

Strip audio from 3GP video recordings as FSSD online

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Audio Extraction

Pull the soundtrack from 3GP video and save it as FSSD. Keep the audio you need without the video weight — ideal for music and podcasts.

No Installation

The converter runs entirely in your web browser. No plugins, no apps, no downloads — just open convertio.co and start converting immediately.

Batch Processing

Upload and convert multiple files simultaneously. Our cloud infrastructure processes them in parallel, saving you time on larger jobs.

How to convert 3GP 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

3GP is a multimedia container format defined by the 3rd Generation Partnership Project as the standard media format for 3G mobile services. Based on the ISO base media file format (MPEG-4 Part 12), it was designed to reduce storage and bandwidth requirements so that mobile phones with limited capabilities could efficiently capture, store, and play video content. The format typically uses H.263 or H.264 video codecs paired with AMR-NB, AMR-WB, or AAC audio. 3GP was instrumental in bringing multimedia to mobile devices during the early smartphone era, when network speeds and device hardware imposed tight constraints on file sizes. The streamlined container strips away overhead found in full MP4 files, resulting in significantly smaller files that stream reliably over slow 3G connections. 3GP supports both GSM and UMTS network protocols and includes provisions for timed text and still images within the container. Broad adoption by major handset manufacturers ensured that practically every 3G-capable phone could handle 3GP media natively. Although modern mobile devices now favor MP4 and other advanced formats, 3GP files are still encountered in archives of older mobile recordings and in regions where bandwidth-efficient video delivery remains important.
Initial release: 2003
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 should I convert 3GP to FSSD?

FSSD serves a specific niche in audio workflows. Converting 3GP to FSSD lets you use the content in specialized tools and platforms requiring this format.

How can I open FSSD files?

FSSD is supported by SoX and applications that work with raw unsigned 8-bit PCM audio data.

Can I convert 3GP to FSSD on my phone?

Yes — convertio.co works in any mobile browser. Upload your 3GP, select FSSD, and download the result directly to your phone or tablet.

Is the conversion private and secure?

Your 3GP uploads are processed securely and removed right after conversion. Output files are purged within 24 hours to protect your privacy.

How long does 3GP to FSSD conversion take?

Conversion speed varies by file length and bitrate. Short 3GP clips become FSSD files in seconds, while longer recordings may take a few minutes.

Will the entire audio track be extracted?

Yes, the converter extracts the entire audio stream from start to finish. The FSSD contains everything heard in the original 3GP recording.