Invisible Audio Watermarking

Embed a hidden watermark in any audio file, or verify whether one is present.

Audio files (select one or more)

Secret key (passphrase)

Keep this secret — you'll need it to verify the watermark later.

Output is always WAV (lossless) to preserve the watermark. Your browser decodes the input, so MP3, OGG, FLAC, etc. are all accepted.