NIST to VOC Converter
Processing entirely on your device — large files may take a moment.
Convert VOC retro-game audio to WAV or MP3. If your files are still in NIST format, this page is the shortcut: NIST SPHERE is the standard format of speech corpora — every academic speech-recognition dataset (TIMIT, Switchboard) ships thousands of .sph files with ASCII headers.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How NIST compares to VOC
| NIST | VOC | |
|---|---|---|
| Structure | NIST SPHERE Speech 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 NIST to VOC
- 1
Select your files
Drag & drop your NIST 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 NIST format
NIST SPHERE is the standard format of speech corpora — every academic speech-recognition dataset (TIMIT, Switchboard) ships thousands of .sph files with ASCII headers.
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 NIST to VOC?
Converting makes sense where the strengths of VOC meet what NIST cannot give you. The DOS gaming era's audio format Meanwhile Legacy niche format One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this NIST 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 NIST 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.
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.
Can I convert a whole folder of NIST 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.