WMA to GSM Converter

Encode WMA audio as GSM 06.10 speech compression

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Telephony Standard

GSM 06.10 powers mobile networks — convert Windows WMA for telephony use.

Compact Output

GSM at 13 kbps produces tiny files for telephony storage.

Online Encoding

No telephony libraries needed — convert WMA to GSM in your browser.

How to convert WMA to GSM

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

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

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

About formats

WMA (Windows Media Audio) is a family of proprietary audio codecs developed by Microsoft and first released in 1999 as part of the Windows Media framework. Created to compete with MP3 and AAC, WMA Standard uses perceptual coding to deliver what Microsoft claimed was near-CD quality at bitrates as low as 64 kbps — roughly half the data rate MP3 typically needed for comparable results. The codec family grew to include WMA Professional for surround sound and high-resolution audio, WMA Lossless for bit-perfect archival compression, and WMA Voice optimized for spoken content at very low bitrates. Deep integration with Windows, Windows Media Player, and the Zune ecosystem gave WMA a strong distribution advantage throughout the 2000s, and digital rights management (DRM) support made it attractive to online music stores of that era. Encoding and decoding are handled natively by Windows, requiring no third-party software for playback on any Windows machine. Cross-platform support has improved through libraries like FFmpeg and GStreamer, though WMA remains less universally compatible than MP3 or AAC on non-Microsoft devices. The format still appears in legacy media libraries, though newer codecs have largely taken its place for streaming and portable use.

Developer: Microsoft Corporation

Initial release: 1999

GSM 06.10 (Full Rate) is the foundational speech codec of the Global System for Mobile Communications standard, ratified by ETSI in 1991 and deployed across hundreds of cellular networks worldwide. Operating at a fixed 13 kbit/s, the algorithm applies Regular Pulse Excitation with Long-Term Prediction (RPE-LTP) to compress 20 ms frames of 8 kHz mono speech into just 33 bytes each. This approach models the vocal tract as a linear predictive filter, encodes the excitation signal, and leverages pitch periodicity for further reduction — tuned to deliver intelligible voice under the bandwidth constraints of early digital mobile channels. The codec powers not only GSM telephony but also many VoIP applications, voicemail systems, and IVR platforms that benefit from its low bitrate. Three concrete advantages stand out. First, extraordinary compression: one minute of speech fits in roughly 100 KB, enabling efficient storage and transmission. Second, universal tooling — libraries such as libgsm and SoX handle encoding and decoding on every major platform. Third, a royalty-free patent landscape that has encouraged adoption across open-source telephony projects like Asterisk and FreeSWITCH.

Developer: European Telecommunications Standards Institute

Initial release: 1991

Frequently Asked Questions

Why convert WMA to GSM?

GSM 06.10 is the standard speech codec for mobile telephony, Asterisk PBX, and VoIP gateways. These systems have no WMA support, so converting your audio to GSM is the only way to deploy it.

Which platforms and devices use GSM 06.10 audio?

Mobile network infrastructure, Asterisk and FreeSWITCH PBX servers, VoIP gateways, IVR menu systems, and SoX on desktop all work with GSM 06.10 encoded audio natively.

Is GSM 06.10 suitable for music or general audio?

No — GSM encodes at roughly 13 kbps and is tuned exclusively for human speech frequencies. Music, sound effects, and ambient audio will sound heavily distorted after conversion.

What bitrate does the GSM output use?

GSM 06.10 operates at a fixed rate of about 13 kbps for mono speech. There are no adjustable quality settings — the codec is designed for a single telephony use case with minimal bandwidth.

Can I convert multiple WMA files to GSM in one go?

Yes — upload a set of WMA recordings and Convertio encodes each to GSM 06.10 simultaneously. Download individual results or grab everything as one compressed archive.

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WMA to GSM Quality Rating

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