SPX to NIST Converter
Re-encode Speex speech into NIST standard audio format
Standard Research Format
Move your Speex recordings into the NIST standard — compatible with speaker recognition evaluations and speech benchmarks.
Cloud Conversion
No need to install the NIST SPHERE toolkit locally. Convert SPX to NIST directly through our cloud service.
Secure Workflow
SPX uploads are removed after conversion. NIST outputs are deleted from servers within 24 hours.
How to convert SPX to NIST
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose nist or any other format you need as a result (more than 200 formats supported)
Let the file convert and you can download your nist file right afterwards
About formats
Frequently Asked Questions
NIST is a standard audio format for speech processing research — used by the National Institute of Standards and Technology in evaluation benchmarks.
NIST files store audio with standardized headers for speech research — used in NIST speaker recognition and language identification evaluations.
NIST SPHERE toolkit, SOX, Kaldi, and Praat handle NIST-format audio natively.
They are closely related — both come from the NIST SPHERE standard. The terms are often used interchangeably in speech research.
Yes — SPX to NIST conversion is free on convertio.tools.