MP4 to GSM Converter

Extract speech audio from MP4 in GSM format online

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Telephony Standard

GSM is the standard codec for mobile telephony. Extracting audio from MP4 to GSM feeds directly into PBX and voice systems.

Minimal File Size

GSM produces the smallest possible audio files from your MP4 — perfect for telephony prompts and voice system recordings.

Cloud-Based Extraction

The entire MP4 to GSM conversion runs on our infrastructure. No codec installations or local processing needed on your end.

How to convert MP4 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

MP4 (MPEG-4 Part 14) is the most widely used multimedia container format in the world, standardized by the Moving Picture Experts Group as part of the MPEG-4 specification in 2003. Built on the ISO base media file format (MPEG-4 Part 12), which itself drew from the Apple QuickTime container, MP4 uses a hierarchical atom/box structure that can encapsulate virtually any type of media data. The container most commonly packages H.264 or H.265 video with AAC audio, though it also supports a wide range of alternative codecs including AV1, VP9, MPEG-4 Visual, AC-3, and ALAC. The design supports advanced features such as streaming hints for progressive download and adaptive streaming, chapter markers, multiple audio and subtitle tracks, metadata tags, and embedded thumbnail images. A standardized structure and broad codec support have made MP4 the default choice for online video platforms, mobile devices, digital cameras, and operating system media libraries. HTML5 video with H.264 in MP4 is supported by every major web browser, establishing the combination as the universal baseline for web video delivery. Efficient packaging overhead, combined with the compression capabilities of modern codecs it carries, enables high-quality video distribution at practical file sizes across bandwidth-constrained networks and storage-limited devices.

Developer: Moving Picture Experts Group

Initial release: 2003

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 MP4 to GSM?

GSM 06.10 is a speech codec used in telephony systems and PBX platforms. Converting provides audio in the native format for voice communication infrastructure.

What opens GSM files?

VLC, Audacity, and SoX handle GSM audio. PBX systems like Asterisk and FreeSWITCH use GSM natively for voice prompts.

Is GSM suitable for music?

No — GSM is optimized purely for human speech at very low bitrates. Music sounds distorted. Use MP3 or FLAC for music content.

How small are GSM files?

GSM produces tiny audio files — roughly 1.6 kbps per channel. This extreme compression is designed for telephony, not general audio.

Can I batch convert?

Upload multiple MP4 files at once and extract the audio from each as a separate GSM file, all processed in parallel.

Does GSM strip the video?

Yes — only the audio is extracted. The video portion of your MP4 is discarded, producing a speech-only GSM audio file.

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MP3 to GSM

WAV to GSM

M4A to GSM

MP4 to GSM

OGG to GSM

MPEG to GSM

AAC to GSM

3GP to GSM

OPUS to GSM

AMR to GSM

ASF to GSM

WMA to GSM

MOV to GSM

AVI to GSM

FLAC to GSM

AIFF to GSM

MKV to GSM

MPG to GSM

WMV to GSM

M4R to GSM

VOX to GSM

SPX to GSM

W64 to GSM

MTS to GSM

OGA to GSM

WVE to GSM

AU to GSM

GSRT to GSM

3G2 to GSM

AAF to GSM

MP4 to GSM Quality Rating

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