VOC to SNDR Converter

Turn Sound Blaster VOC recordings into SNDR audio

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Raw Audio Output

SNDR provides minimally structured audio data. Converting VOC to SNDR gives you raw samples for custom processing pipelines.

Hosted Conversion

No need for local SoX installations or script work. Convert your VOC files to SNDR directly in the browser.

Private and Secure

All uploaded VOC recordings are deleted immediately. SNDR outputs are purged from our servers within 24 hours.

How to convert VOC to SNDR

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose sndr or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your sndr file right afterwards

About formats

VOC (Creative Voice) is a digital audio container developed by Creative Technology and introduced alongside the original Sound Blaster card in 1989. It served as the native audio format for the Sound Blaster family during the DOS era, when Creative's hardware dominated PC audio. VOC files are block-based: each file consists of typed data blocks that can carry 8-bit unsigned PCM, 4-bit and 2.6-bit Creative ADPCM, 16-bit signed PCM, as well as A-law and mu-law encoded audio. This block structure also supports silence intervals, repeat loops, and marker points, giving game developers fine-grained control over sound playback. A notable advantage was hardware-level decoding — Sound Blaster cards could play VOC data directly via DMA transfer, freeing the CPU for other tasks in an era when processor cycles were precious. The format saw extensive use in DOS games from id Software, Sierra, and LucasArts. With the rise of Windows and the WAV format, VOC gradually fell out of mainstream use, yet it remains important for retro gaming preservation and for anyone working with vintage PC audio archives.
Initial release: 1989
SNDR is the audio file format produced by Sounder, an early MS-DOS sound recording and playback utility from the early 1990s. Before Windows brought multimedia to the mainstream, Sounder was among a handful of DOS programs that let PC users capture and play audio through rudimentary hardware — often the PC speaker itself or early 8-bit sound cards. The format stores 8-bit unsigned PCM samples without any file header, relying on application defaults to determine playback parameters. Sample rates were typically low (4000 to 11025 Hz), reflecting hardware limits and storage costs when a 20 MB hard drive was considered generous. One practical advantage was absolute minimalism — with zero overhead bytes, every bit of the file was audio data, which mattered when storage was measured in kilobytes. The format could be piped directly to sound hardware without parsing, making real-time playback feasible on slow processors. Despite its simplicity, SNDR holds a place in computing history as one of the formats that brought digital audio to ordinary PCs. Files from this era occasionally surface in retrocomputing archives. SoX and ffmpeg can interpret SNDR files given the correct parameters, enabling preservation of early digital audio recordings.
Developer: Sounder (MS-DOS)
Initial release: 1991

Frequently Asked Questions

Why convert VOC to SNDR?

SNDR is a raw audio format for legacy and specialized audio processing workflows. Converting VOC provides raw data for custom applications.

What can open SNDR files?

SoX is the primary tool for working with SNDR files. Custom audio processing scripts and research tools also handle the format.

What is the SNDR format?

SNDR is a raw audio format with minimal structure. Used in legacy audio research and specialized signal processing applications.

Can regular media players open SNDR?

Most consumer media players cannot open SNDR. Use SoX or custom audio tools to process and play SNDR data.

Is SNDR the same as SND?

No. Despite similar names, SNDR is a distinct raw format, while SND is a structured container used on NeXT and Unix systems.