WTV to GSM Converter
Processing entirely on your device — large files may take a moment.
Convert GSM speech recordings to WAV or MP3. If your files are still in WTV format, this page is the shortcut: WTV is Windows Media Center's TV recording format — tuner captures with metadata, subtitles and multiple audio tracks inside.
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 WTV compares to GSM
| WTV | GSM | |
|---|---|---|
| Structure | Microsoft WTV container + MPEG-TS payload | Raw GSM frames (33 bytes/20ms) |
| Types / schema | MPEG-2/H.264 + subtitles | Lossy speech codec (RPE-LTP) |
| Compatibility | ffmpeg, Windows Media Center | Asterisk, SoX, ffmpeg |
| Best for | PVR archive migration | Telephony recordings |
How to convert WTV to GSM
- 1
Select your files
Select your WTV video.
- 2
Convert instantly
The engine demuxes the container and encodes the audio track into your chosen format.
- 3
Download results
Download the GSM audio — the video track is simply dropped.
About the WTV format
WTV is Windows Media Center's recording format — what a tuner card wrote when you scheduled a TV show. Inside sits the broadcast transport stream (MPEG-2 or H.264) plus title metadata, subtitle tracks and multiple audio languages, all wrapped in Microsoft's own container.
Media Center died with Windows 10, but the recordings live on: ffmpeg reads WTV natively, so converting to MP4 or MKV keeps the content playable on any device with the metadata you actually care about.
+ Strengths
- ✓Complete tuner captures with subtitles
- ✓Multi-language audio preserved
- ✓ffmpeg decodes natively
! Limitations
- −DVR-MS (older) is a different format
- −Broadcast DRM variants exist
- −Copy-once flags block some captures
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
Why convert WTV to GSM?
Converting makes sense where the strengths of GSM meet what WTV cannot give you. Tiny bitrate for speech intelligibility Meanwhile DVR-MS (older) is a different format One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this WTV to GSM 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 WTV to GSM?
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.
Why is video conversion slower than image conversion?
Every frame has to be decoded and re-encoded. This site runs that work on your own CPU via WebAssembly — nothing is uploaded, but a multi-minute video reasonably takes a few minutes. Images, by comparison, are single-frame jobs.
Will the audio track be kept?
Yes. The audio is carried over and re-encoded to the standard audio codec of GSM, staying in sync with the video. If your WTV file has multiple audio tracks, the first one is used.