Trust and safety
Audio Detector
Check any audio file for the inaudible Pynokio watermark. Free, with no account needed.
Check a file
Drop a recording below. The detector analyses its first 60 seconds and lights up one segment of the wave for every bit of the Pynokio identifier it reads.
How to read the result
Every Pynokio voice carries a watermark holding a 16-bit Pynokio identifier. The detector reads those bits back; ordinary recordings give random bits, so they show no match.
| Pynokio original confirmed | The file has a valid signed record from Pynokio and its audio has not changed since it was created. |
|---|---|
| Watermark found | The Pynokio identifier was read. Strong evidence of Pynokio origin, though not a cryptographic signature. |
| Possible watermark | Part of the identifier was read, as in a heavily compressed or edited copy. Origin is not confirmed. |
| No watermark found | The identifier is not in this audio. This does not prove the file was made elsewhere. |
Limits
The watermark survives common edits such as MP3 at 128 kb/s or more, trimming, background music or loudness changes. Heavy processing can make it unreadable:
- telephone-band filtering, loud noise or aggressive noise reduction,
- changes of speed or pitch,
- very short clips, where fewer bits can be read.
Privacy
The file is sent to the Pynokio detection engine only for this check and the temporary copy is deleted as soon as the result is ready. It is not added to any library and does not require an account. Files can be up to 32 MB; one network can run up to 6 checks per hour.
The watermark parameters are described in Machine-readable marking.