What image formats can I convert to?

You can convert to JPEG, PNG, WebP, GIF, BMP, TIFF, PNM, and AVIF.

Can I convert multiple images at once?

Yes. You can select multiple files and they will be converted and downloaded in batch.

What input formats are supported?

JPEG, PNG, WebP, GIF, BMP, TIFF, TGA, ICO, PNM, HDR, EXR, AVIF, HEIC, HEIF, SVG, PSD, CR2, NEF, and DNG.

CELT to GSM — Free Online Audio Converter

Q: How do you store my files?

We do not store any processed images.

Q: Is this tool free to use?

Yes, this converter is completely free.

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| convert [audio.celt] —> [output.gsm]

[+] Convert CELT to GSM

[+] Drop CELT audio here or click to select CELT

Output format

GSM (GSM)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

[+] Donate

[?] FAQ

How do I convert CELT to GSM?

Drop your CELT file onto this page, choose quality and codec settings, then click Convert. The result downloads as GSM instantly. All processing runs in your browser.

Is CELT to GSM conversion free?

Yes, this converter is completely free with no limits on file size or number of conversions.

What codec is used for GSM?

The default codec for GSM is GSM. You can change audio parameters in Advanced mode.

How do you store my files?

We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.

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