Free online FLAC to VOX converter

Source format: FLAC

FLAC stands for Free Lossless Audio Codec. It is a widely used audio format for storing music and other sound recordings without losing any original audio data during compression. FLAC is popular with audiophiles, music collectors, archivists, and anyone who wants smaller files than WAV or AIFF while keeping bit-perfect quality. Typical uses include music libraries, archival masters, and high-quality distribution.

Target format: VOX

VOX usually refers to the Dialogic ADPCM audio format, a compressed format often associated with telephony and voice recordings. It is designed for speech and other narrowband audio rather than full-range music. VOX files are typically small and simple, which makes them useful for voice prompts, IVR systems, legacy telephony workflows, and some specialized audio applications. Compared with FLAC, VOX offers much lower fidelity but much smaller size for voice-oriented content.

How to perform the conversion

The most reliable way to convert FLAC to VOX is with a desktop audio tool such as FFmpeg. Because VOX is a specialized format, not every audio editor supports it directly, but FFmpeg can usually handle the conversion cleanly.

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing your FLAC file.
3. Run a command such as ffmpeg -i input.flac -ar 8000 -ac 1 -c:a adpcm_ima_ws output.vox.
4. Check the resulting file in a VOX-compatible player or in the target telephony application.

If your source audio is music or stereo content, consider trimming it to the speech segment first, because VOX is best suited to mono voice audio. If you prefer a graphical workflow, some audio editors can export to VOX through File → Export or File → Save As, but support varies by version and plugin availability.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality, compatibility, or limitations

FLAC to VOX is a lossy conversion. FLAC is lossless, but VOX uses ADPCM compression, so audio detail is discarded during export and the result will not match the original quality. This conversion is usually appropriate only when the destination system specifically requires VOX or when you are preparing speech recordings for legacy equipment.

VOX commonly expects mono audio and a low sample rate such as 8000 Hz. If you convert stereo music directly, the result may sound poor or may not be accepted by the target software. For best compatibility, downmix to mono and keep the audio in a speech-friendly range. Also note that some programs use the .vox extension differently, so verify that the target system expects the Dialogic-style VOX format before converting.