Download and install the latest version of Filestar.
Right click on one or more Sph file(s) on your desktop and select Convert with Filestar.
Type convert to sndr in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.sph -c "convert to sndr" (how).
Documents - File Explorer─☐✕
This PC › Documents
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.sphContract.sph
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert SPH to SNDR
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the SPH files in my Downloads folder to SNDR”
Or run it yourself:
filestarcli -i file.sph -c "convert to sndr"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert SPH to SNDR?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.sph -c "convert to sndr" on your computer, so your files stay on it.
Waveform audio file created in the NIST SPHERE format, which is often used in speech recognition research; often contains a recording of a person speaking; can be provided as input to speech recognition systems.
The SNDR file extension is used for older 8-bits mono sound format which was used in old Sounder program.