Embed an Invisible Watermark in Your Audio

A free steganography tool that hides ownership text inside audio files using ultrasonic spread-spectrum encoding. The hidden signature survives MP3 compression, format conversion, and most audio edits — without any audible change to your recording.

How to Use

1
Upload your audio file

Open the Embed tab and select an MP3, WAV, OGG, or FLAC file from your device.

2
Enter watermark text

Type your name, website URL, or any identifier you want to embed as proof of ownership.

3
Choose strength level

Select Light for delicate recordings, Normal for everyday use, or Strong for files that will undergo heavy compression.

4
Embed and optionally add metadata

Click Embed Watermark. Optionally check "Also embed in file metadata" for dual protection.

5
Download and verify

Save the watermarked file, then use the Detect tab to confirm the signature was embedded correctly.

Stamp your recordings with an inaudible copyright signature — invisible, tamper-resistant, browser-only

Drop audio or video here or click to browse
MP3, WAV, OGG, FLAC, AAC, M4A, M4B, WMA, AIFF, OPUS, WEBM, CAF, 3GP, MP4, MOV, MKA ·
Lossless format — watermark fully preserved
Original
Watermarked
Designed to be inaudible on standard playback
Drop audio or video here or click to browse
MP3, WAV, OGG, FLAC, AAC, M4A, M4B, WMA, AIFF, OPUS, WEBM, CAF, 3GP, MP4, MOV, MKA ·

Features

Spread-spectrum steganography at 18.5 kHz carrier — below the threshold of perception Four strength levels: Transparent (inaudible for pro mixes), Light (minimal impact), Normal (recommended), Strong (maximum durability) Optional metadata embedding stores watermark text in file tags as a second layer of protection Built-in detector verifies and reads hidden signatures from any uploaded audio file

FAQ

Can people hear the watermark?

No. The watermark is encoded at an 18.5 kHz ultrasonic carrier using spread-spectrum modulation. At Normal strength it is completely imperceptible on any standard playback system.

Does it survive MP3 compression?

Yes at Normal and Strong settings. MP3 encoding removes some high-frequency energy, but the spread-spectrum signal is distributed broadly enough to survive typical 128–320 kbps compression. Light watermarks may weaken after aggressive compression.

What languages and scripts are supported?

Any text encoded as Unicode UTF-8 works: Latin, Cyrillic, Arabic, Chinese, Japanese, Korean, and all other scripts. Emoji are supported too.

What is metadata embedding?

Checking "Also embed in file metadata" writes the watermark text into the audio file's ID3 or Vorbis comment tags. This provides a second, easily readable layer of ownership information alongside the hidden steganographic signature.

Can I use the watermark to prove ownership in court?

A steganographic watermark can serve as supporting evidence of authorship — especially when combined with metadata embedding and a dated original file. However, it is not a legal certificate by itself. For formal copyright registration consult the relevant authority in your country.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

You May Also Like

🔍 Audio Forensics 🔬 Audio Inspector 🏷️ Audio Metadata Editor ✂️ Audio Splice Detector 🎼 Audio to Notes 🎯 BPM & Key Finder

How do you rate this tool?

5
(1 rating)
Thank you for your rating!
Want to share more? Leave a comment!
Thank you! Your comment will appear after moderation.
Who is this tool for?
🎛️ Sound Engineers ✨ Content Creators 🔒 Security & Privacy
Published Updated