WAV to GSM Converter

Encode WAV recordings in GSM telephony codec online

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Telephony Codec

GSM 06.10 is the foundation of mobile telephony — convert your WAV recordings for direct use in PBX, IVR, and VoIP systems.

Extreme Compression

GSM shrinks WAV files by over 99% — a full minute of voice audio fits in about 96 KB.

Web-Based Tool

Convert WAV to GSM from any browser — no Asterisk installation or command-line SoX usage required.

How to convert WAV to GSM

1

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

2

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

3

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

About formats

WAV (Waveform Audio File Format) is an uncompressed audio container jointly developed by Microsoft and IBM, first published in August 1991 alongside Windows 3.1. Built on the Resource Interchange File Format (RIFF), WAV stores audio data — most commonly as linear pulse-code modulation (LPCM) — together with metadata describing sample rate, bit depth, and channel count. This straightforward structure has made WAV the de facto standard for uncompressed audio on Windows and a universally accepted interchange format across virtually every operating system, audio editor, and media player in existence. CD-quality WAV files use 16-bit samples at 44.1 kHz stereo, while professional workflows routinely employ 24-bit or 32-bit float samples at rates up to 192 kHz. A major advantage is zero-loss fidelity: because standard WAV applies no compression, the stored data is an exact digital representation of the original recording, making it the preferred choice for mastering and archiving. WAV also supports embedded metadata through INFO and BWF chunks, enabling timestamping and production notes. The main trade-off is file size — one minute of CD-quality stereo occupies roughly 10 MB — and the 32-bit RIFF structure imposes a 4 GB limit, though RF64 removes that ceiling.
Developer: Microsoft and IBM
Initial release: August 1991
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.
Initial release: 1991

Frequently Asked Questions

Why convert WAV to GSM?

GSM 06.10 is the standard speech codec for mobile telephony and VoIP. Asterisk PBX systems and IVR platforms frequently require GSM-encoded audio.

What plays GSM files?

VLC, Audacity, SoX, and telephony platforms like Asterisk and FreeSWITCH decode GSM audio natively.

How compact is GSM compared to WAV?

Dramatically — GSM compresses audio to about 1.6 KB per second. A WAV file that is 10 MB becomes roughly 100 KB in GSM.

Is GSM suitable for music?

No. GSM is designed for speech at 13 kbps. Music loses most of its quality when encoded with this codec.

Can I convert multiple prompts?

Upload all your WAV voice prompts and batch-convert them to GSM — efficient for setting up a phone system.

WAV to GSM Quality Rating

4.7 (1,300 votes)
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