AIFF to SPH Converter

Turn your AIFF audio into SPH format quickly

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Direct AIFF-to-SPH Path

Go from AIFF to SPH without intermediate steps. The converter handles the codec transformation automatically.

Runs in the Cloud

The heavy lifting happens on our servers — your device simply uploads and downloads, no CPU strain involved.

Sound Integrity

Audio content is handled carefully during conversion to maintain the highest fidelity the output format supports.

How to convert AIFF 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

AIFF (Audio Interchange File Format) was developed by Apple in 1988, drawing its structural design from Electronic Arts' IFF standard. As an uncompressed audio container, AIFF stores linear PCM data at full CD quality — typically 16-bit at 44.1 kHz — preserving every detail of the original recording without lossy encoding. The format organizes content into chunks that can also carry metadata such as markers, instrument definitions, and comments. Professional audio engineers on macOS frequently rely on AIFF because it guarantees bit-perfect fidelity through every stage of editing and mastering. One significant advantage is zero generational loss: unlike MP3 or AAC, repeated saves never degrade the signal. Another strength is seamless integration with Apple's professional tools, including Logic Pro and GarageBand, where AIFF serves as a native working format. The container supports multiple sample rates and bit depths up to 32-bit, accommodating high-resolution workflows that exceed CD-quality specifications. For anyone prioritizing lossless integrity over storage efficiency, AIFF remains a dependable choice across the recording industry.
Developer: Apple Inc.
Initial release: 1988
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 convert AIFF to SPH?

SPHERE format is standard in linguistic research. Convert AIFF when building or contributing to speech databases.

What programs can open SPH files?

NIST SPHERE tools, SoX, and speech research software handle SPH files natively.

Is the AIFF to SPH conversion fast?

Yes — most audio files convert in just a few seconds. The process runs on fast cloud servers, so your device stays free.

Is my AIFF audio kept private during conversion?

Your uploaded AIFF files are deleted immediately after conversion. Output files are automatically removed within 24 hours.

Does this work on Mac and Windows?

The converter runs in any web browser on any platform — Windows, macOS, Linux, and mobile devices alike.

Can I adjust SPH output settings?

Yes — you can modify parameters like bitrate and sample rate before conversion to match your requirements.