Online Tool Store
IVR Audio Converter
Convert browser-decodable audio into 8 kHz or 16 kHz mono 16-bit PCM WAV files with optional peak normalization, local preview, and download.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Audio
IVR Audio Converter
Create a phone-system-ready WAV locally in your browser. Your audio never leaves this device.
No file selected.
Choose an audio file to begin.
How the IVR Audio Converter works
- Choose an audio file that your browser can decode.
- Choose a narrowband 8 kHz or HD voice 16 kHz mono PCM16 WAV profile.
- Choose whether to normalize the peak to -1 dBFS, then convert the file locally.
- Preview the converted WAV and download it with its sample-rate profile in the filename.
The method
The converter decodes the source, downmixes it to one channel, and uses an OfflineAudioContext to resample it to the selected target rate.
8000 samples/sec mono, 16-bit PCM = 128 kbit/s
The output is a standard RIFF WAV with one mono channel and signed 16-bit PCM samples. Always confirm the exact codec and naming rules with your PBX provider.
FAQ
Why does my hold music sound thin on the phone?
Telephone networks carry a limited voice band, so bass-heavy and high-frequency content can lose detail. Test the converted file through your phone system before publishing it.
Which format does my system need?
Many narrowband PBX prompt workflows use 8 kHz mono PCM WAV. HD voice systems may use 16 kHz mono audio. Check your provider's documentation before choosing a profile.
How loud should a prompt be?
Aim for consistent levels rather than simply making the file louder. The normalization option sets a -1 dBFS peak and avoids increasing samples beyond the valid PCM range.
Does this tool upload my audio?
No. Decoding, resampling, normalization, WAV encoding, preview, and download happen in your browser. The tool does not send the selected file to a server.
Will this work for FreePBX, 3CX, Asterisk, or Cisco CUCM?
Most PBX systems, including FreePBX, 3CX, Asterisk, and Cisco CUCM, accept 8 kHz mono 16-bit PCM WAV for prompts and hold music. Always confirm the exact requirement in your provider's documentation before uploading.
Does this convert to u-law or a-law WAV?
No. This tool outputs standard 16-bit PCM WAV at 8 kHz or 16 kHz. If your phone system specifically requires G.711 u-law or a-law encoding, use a codec-specific converter for that step.
How we compare
| Feature | Online Tool Store | WOCOM | Asterisk Converter |
|---|---|---|---|
| 8 kHz and 16 kHz mono PCM WAV | Yes | Yes | Yes |
| Actual local conversion and download | Yes | Yes | Not observed |
| Peak normalization option | Yes | Not observed | Not observed |
| Browser-based local processing | Yes | Yes | Provider-dependent |
IVR Audio Converter keeps the common PBX preparation steps in one local workflow: decode, downmix, resample, normalize, preview, and download.