HTK to VOC Converter
Processing entirely on your device — large files may take a moment.
Hidden Markov Toolkit and Creative Sound Blaster VOC exist for different jobs: HTK is the sample format of the Cambridge Hidden Markov Model Toolkit — big-endian speech features and audio used throughout older speech research. Convert VOC retro-game audio 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 HTK compares to VOC
| HTK | VOC | |
|---|---|---|
| Structure | Hidden Markov Toolkit container | Creative Voice file blocks (0x08 header) |
| Compatibility | ffmpeg, archive tools | ffmpeg, Sound Blaster era tools |
| Best for | Rescuing legacy audio | Retro-game audio rescue |
How to convert HTK to VOC
- 1
Select your files
Drag & drop your HTK 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 VOC". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted VOC file individually, or grab everything at once as a ZIP archive.
About the HTK format
HTK is the sample format of the Cambridge Hidden Markov Model Toolkit — big-endian speech features and audio used throughout older speech research.
ffmpeg decodes it natively inside your browser — the audio track is re-encoded to your chosen format with nothing ever uploaded.
+ Strengths
- ✓Decoded natively by ffmpeg
- ✓Runs entirely in your browser
- ✓Free, private, no watermarks
! Limitations
- −Legacy niche format
- −Modern tools rarely open it
- −Keep the original for archival round-trips
About the VOC format
VOC is the Creative Sound Blaster format — if a DOS game made a sound between 1989 and 1994, it was probably a VOC: 8-bit samples at exotic sample rates, with loop points, silence blocks and hardware-specific appendices that made each card sing differently.
ffmpeg decodes the standard sample blocks and converts VOC to WAV or MP3 — the cheapest time machine for retro-game audio.
+ Strengths
- ✓The DOS gaming era's audio format
- ✓Unique features: loops, silence, transfer blocks
- ✓Simple to decode
! Limitations
- −8-bit/11kHz era fidelity
- −Creative hardware extensions lost on convert
- −Rarely produced after 1995
Why convert HTK to VOC?
Think of it as moving your file to the container that fits the job. Legacy niche format VOC works differently: The DOS gaming era's audio format If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this HTK to VOC 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 HTK to VOC?
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 HTK to VOC reduce audio quality?
If VOC is lossless, the output contains everything the HTK file contains — no further loss is added. If VOC 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 HTK 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.