WV to GSM Converter
Processing entirely on your device — large files may take a moment.
WavPack and GSM 06.10 Speech exist for different jobs: WavPack is the hybrid lossless format — its unique lossy-plus-correction mode ships a small file that can be restored to bit-exact audio. Convert GSM speech recordings to WAV or MP3.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How WV compares to GSM
| WV | GSM | |
|---|---|---|
| Structure | wvpk frame blocks | Raw GSM frames (33 bytes/20ms) |
| Types / schema | Lossless/hybrid, up to 32-bit | Lossy speech codec (RPE-LTP) |
| Compatibility | ffmpeg, WavPack CLI, fb2k | Asterisk, SoX, ffmpeg |
| Best for | Flexible archiving workflows | Telephony recordings |
How to convert WV to GSM
- 1
Select your files
Drag & drop your WV 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 GSM". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted GSM file individually, or grab everything at once as a ZIP archive.
About the WV format
WavPack's signature trick is the hybrid mode: encode once into a small lossy .wv plus a tiny .wvc correction file — together they are bit-exact lossless, apart the small file plays like a high-quality MP3. It also offers pure lossless and pure lossy modes in the same container.
Full WavPack files decode losslessly through ffmpeg into FLAC or WAV; hybrid correction files are handled by the original encoder only, so a .wvc alone cannot be restored.
+ Strengths
- ✓Unique hybrid lossy+correction mode
- ✓Fast decode, open source
- ✓Error-robust streaming modes
! Limitations
- −Ratios slightly behind APE
- −.wvc correction files are orphaned here
- −Hardware support rare
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 WV to GSM?
Converting makes sense where the strengths of GSM meet what WV cannot give you. Tiny bitrate for speech intelligibility Meanwhile Ratios slightly behind APE One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this WV 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 WV 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.
Will converting WV to GSM reduce audio quality?
If GSM is lossless, the output contains everything the WV file contains — no further loss is added. If GSM 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.
Can I convert a whole folder of WV files?
You can select many files at once and they are processed in a single batch. Output files land in one ZIP download when there is more than one result.