PAF to SPH Converter

Switch from PAF to SPH with a browser-based converter

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Modern Format

PAF recordings become far more usable as SPH. The conversion unlocks NIST-specified format that PAF cannot provide.

Bulk Conversion

Handle multiple PAF to SPH conversions at once. Upload your batch and let the converter process them in parallel.

Effortless Conversion

The entire PAF to SPH process is designed for simplicity. Drag your audio in, pick the format, and grab the output.

How to convert PAF to SPH

1

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

2

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

3

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

About formats

PAF (Paris Audio File) is the native audio format of the Ensoniq PARIS (Professional Audio Recording Integrated System) digital audio workstation, developed by Ensoniq in the late 1990s. PARIS was a hardware/software DAW that earned a loyal following among recording engineers for its warm analog-like sound and reliable operation, with PAF serving as its primary working file container. The format stores uncompressed PCM audio at 16-bit or 24-bit resolution and standard professional sample rates (44.1, 48, and 96 kHz), preserving full fidelity without lossy compression. PAF uses a straightforward binary layout — a compact header followed by interleaved sample data — enabling efficient real-time read and write during recording sessions. One notable advantage is support for both big-endian and little-endian byte ordering, reflecting the PARIS system's cross-platform roots on Mac and PC. After Ensoniq's acquisition by E-mu Systems and then Creative Technology, the PARIS DAW was discontinued, but PAF files remain important for studios with archived projects in this format. Tools like SoX and libsndfile can read and convert PAF files, ensuring long-term accessibility.
Developer: Ensoniq
Initial release: 1998
SPH is the file extension for audio stored in the NIST SPHERE (SPeech HEader REsources) format, a standard created by the U.S. National Institute of Standards and Technology around 1990. Built for speech research, SPH files carry a 1024-byte ASCII header packed with metadata — database identifiers, channel counts, sample rates, byte ordering, and compression type — making every recording self-describing. The underlying audio is typically 16-bit linear PCM sampled at 16 kHz, though other configurations are permitted. Researchers at NIST, DARPA, and universities worldwide rely on SPH for distributing speech corpora such as TIMIT, Switchboard, and the LDC collections that underpin modern automatic speech recognition systems. A key advantage is that the human-readable header lets scripts parse recording metadata without binary decoding. The format's strict standardization also eliminates ambiguity when sharing datasets across institutions and platforms. Because SPH files store uncompressed PCM, they preserve full audio fidelity — critical when training acoustic models where even small artifacts can skew results.
Initial release: 1990

Frequently Asked Questions

Why should I switch from PAF to SPH?

PAF suffers from niche big-endian audio format no longer in active use. SPH offers academic speech database standard.

Which software opens SPH recordings?

You can open SPH with HTK toolkit, SoX, and speech research tools.

Is there quality loss from PAF to SPH?

No quality is lost. SPH stores audio without additional compression, so your PAF recording carries over at full original fidelity.

Is PAF to SPH conversion available on all platforms?

It works on any platform — desktop or mobile. Just open your browser, upload the PAF recording, and convert to SPH.

Is my PAF audio kept private during conversion?

Your uploaded PAF recordings are deleted immediately after conversion. The resulting SPH outputs are removed within 24 hours.

Do I need to install anything for PAF to SPH?

No installation required. The converter runs entirely in your web browser — just upload, convert, and download.