Free online AIFF to VOX converter

Source format: AIFF

AIFF (Audio Interchange File Format) is a classic uncompressed audio format developed by Apple. It is widely used in professional audio production, especially on macOS systems, because it preserves high audio quality and supports standard PCM audio data. AIFF files are common for recording, editing, archiving, and exchanging master-quality audio between digital audio workstations.

Target format: VOX

VOX is a family of audio formats most commonly associated with Dialogic/OKI ADPCM compressed audio. It is a low-bitrate, telephony-oriented format designed to store speech efficiently rather than deliver high-fidelity music playback. VOX files are typically used in voice prompts, IVR systems, call-center applications, and legacy telephony software.

How to perform the conversion

The most reliable way to convert AIFF to VOX is with FFmpeg, a widely used command-line audio tool that supports both formats in many builds. Because VOX is usually intended for speech, you should expect to downsample and convert to mono before encoding.

1. Install FFmpeg if it is not already available on your system.
2. Open a terminal or command prompt.
3. Run a conversion command such as ffmpeg -i input.aiff -ac 1 -ar 8000 -c:a adpcm_ima_oki output.vox
4. Check the resulting file in the target application or with an audio player that supports VOX.

If your FFmpeg build does not support the VOX encoder you need, another practical option is to convert the AIFF file first to a compatible intermediate format and then use audio software that can export VOX. In some cases, specialized telephony or audio utilities may be required because VOX support is less common than support for standard formats like WAV or MP3.

If you prefer a web-based workflow, you can convert the file on 101convert.com for free without installing any software.

Quality, compatibility, and limitations

AIFF is high quality and often uncompressed, while VOX is highly compressed and speech-focused. As a result, converting from AIFF to VOX usually causes a significant loss of fidelity, especially for music, stereo content, or material with a wide frequency range. VOX is generally best for voice recordings, not full-range audio.

Important limitations to keep in mind:

• Mono is usually required or strongly preferred for VOX.
• Sample rates are often low, commonly around 8000 Hz for telephony use.
• Stereo AIFF files should usually be mixed down before conversion.
• Playback compatibility can vary because VOX is a niche legacy format.
• Metadata support is typically minimal or absent in VOX files.

For best results, use AIFF source material that is primarily spoken voice, and verify the exact VOX variant required by the destination system before converting.