GSM to PCM Converter
Processing entirely on your device — large files may take a moment.
Convert any audio to raw PCM for DSP pipelines, or wrap a PCM dump into WAV/MP3 to make it playable. If your files are still in GSM format, this page is the shortcut: GSM 06.10 is the 1990s mobile-telephony speech codec — 13 kbit/s audio that VoIP systems and old answering machines still emit.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How to convert GSM to PCM
- 1
Select your files
Drag & drop your GSM files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to PCM". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted PCM file individually, or grab everything at once as a ZIP archive.
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
About the PCM format
Raw PCM is audio at its most naked: 16-bit little-endian samples, no header, no metadata, no sample-rate label — just the waveform bytes. It is the lowest common denominator every DSP pipeline, telephony stack and embedded system speaks, which is why exports and lab tools keep asking for it.
Because the file carries no sample-rate information, consumers must agree on the rate out of band (8000 Hz telephony and 48000 Hz video are the common conventions). Wrapping PCM into WAV adds the missing header and makes the bytes playable anywhere.
+Strengths
- ✓Zero overhead — pure sample data
- ✓Universally understood by DSP tools
- ✓Bit-exact lossless representation
!Limitations
- −No header: sample rate must be known out of band
- −Unplayable directly in most apps
Why convert GSM to PCM?
Think of it as moving your file to the container that fits the job. Speech-only quality — music falls apart PCM works differently: Zero overhead — pure sample data If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this GSM to PCM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for GSM to PCM?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Are tags like title and artist preserved?
Tag handling varies between target formats and this conversion focuses on the audio itself. For archival copies where tags matter, keep the original file; the converted copy is for playback and sharing.
Will converting GSM to PCM reduce audio quality?
If PCM is lossless, the output contains everything the GSM file contains — no further loss is added. If PCM is lossy, one recompression pass is unavoidable; the quality slider controls how much. Loss that already happened in the source file can never be undone by converting.