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GSM File Format

GSM 06.10 Speech category

GSM 06.10 is the 1990s mobile-telephony speech codec — 13 kbit/s audio that VoIP systems and old answering machines still emit.

Typical use: Convert GSM speech recordings to WAV or MP3.

About the GSM format

GSM 06.10 is the speech codec of the original GSM mobile network — 13 kbit/s RPE-LTP that made digital cellphone calls possible in 1991 and still lives inside VoIP systems, old answering machines and Asterisk PBX recordings.

It is lossy speech, not music: converting GSM to WAV or MP3 preserves intelligibility perfectly while finally letting desktop players open the file without special codecs.

Strengths

  • ✓ Tiny bitrate for speech intelligibility
  • ✓ Ubiquitous in telephony systems
  • ✓ Decodes natively via ffmpeg

Limitations

  • ✗ Speech-only quality — music falls apart
  • ✗ 13 kbit/s artifacts are audible
  • ✗ 8000 Hz sample rate only
Structure
Raw GSM frames (33 bytes/20ms)
Types / schema
Lossy speech codec (RPE-LTP)
Compatibility
Asterisk, SoX, ffmpeg
Best for
Telephony recordings

Convert GSM to…

26 direct directions plus 18 workflows, sorted A–Z; 🔥 marks popular targets.

GSM to AAC Hot GSM to AC3 GSM to AIF GSM to AIFF GSM to ALAC GSM to AU GSM to CAF GSM to E-AC3 GSM to F4A GSM to F4B GSM to FLAC Hot GSM to M4A Hot GSM to M4B GSM to M4R GSM to MP2 GSM to MP3 Hot GSM to OGA GSM to OGG Hot GSM to OPUS GSM to PCM GSM to TTA GSM to VOC GSM to W64 GSM to WAV Hot GSM to WAVPCM GSM to WV

Cross-engine workflows

GSM to 7Z GSM to APK GSM to JAR GSM to MKV GSM to MOV GSM to MP4 GSM to PNG GSM to PNG24 GSM to PNG8 GSM to TAR GSM to TAR.BZ2 GSM to TAR.GZ GSM to TAR.XZ GSM to TBZ2 GSM to TGZ GSM to TXZ GSM to WIM GSM to ZIP

Convert other files to GSM…

AAC to GSM Hot AC3 to GSM AIF to GSM AIFF to GSM ALAC to GSM AMB to GSM AMR to GSM APE to GSM AU to GSM AVR to GSM CAF to GSM CVS to GSM CVU to GSM DSS to GSM DTS to GSM E-AC3 to GSM F32 to GSM F4A to GSM F4B to GSM F64 to GSM FAP to GSM FLAC to GSM Hot FSSD to GSM GSRT to GSM HCOM to GSM HTK to GSM IRCAM to GSM M4A to GSM Hot M4B to GSM M4R to GSM MAUD to GSM MOD to GSM MP2 to GSM MP3 to GSM Hot OGA to GSM OGG to GSM Hot OMA to GSM OPUS to GSM PAF to GSM PVF to GSM QCP to GSM S16 to GSM S24 to GSM S32 to GSM S3M to GSM SD2 to GSM SHN to GSM SMP to GSM SNDR to GSM SNDT to GSM SPX to GSM TAK to GSM TTA to GSM TXW to GSM U8 to GSM VMS to GSM VOC to GSM VQF to GSM W64 to GSM WAV to GSM Hot WAVPCM to GSM WMA to GSM WV to GSM WVE to GSM XI to GSM XM to GSM

Cross-engine workflows

3G2 to GSM 3GP to GSM ASF to GSM AVI to GSM DivX to GSM DV to GSM F4V to GSM FLV to GSM H.264 to GSM M1V to GSM M2TS to GSM M2V to GSM M4V to GSM MJPEG to GSM MKV to GSM MOV to GSM MP4 to GSM MPEG to GSM MPEG1 to GSM MPEG2 to GSM MPEG4 to GSM MPG to GSM MTS to GSM MXF to GSM OGV to GSM RM to GSM RMVB to GSM TS to GSM VOB to GSM WEBM to GSM WMV to GSM WTV to GSM Xvid to GSM Y4M to GSM

Frequently asked questions

What is a GSM file?

GSM 06.10 is the 1990s mobile-telephony speech codec — 13 kbit/s audio that VoIP systems and old answering machines still emit.

How do I convert GSM files online?

Pick a target format from the "Convert GSM to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.

Is it safe to convert GSM files here?

Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.

Which formats can GSM convert to?

This page lists all 44 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.