Watermark Detector

Find hidden watermarks in text: invisible characters, homoglyphs, steganography. Clean text with one click.

Enter a page URL — text will be automatically extracted for analysis

Watermark Detector — Hidden Text Marks

Detect hidden watermarks in text: zero-width characters, homoglyphs, invisible formatting, steganography. Clean text from hidden marks for safe publication.

Zero-width character detection (U+200B, U+FEFF etc.)
Homoglyph detection (visually identical characters)
Invisible formatting detection
Steganographic insertion detection
Cleaning text from all hidden marks
Detailed report on found marks

How to Use

  1. Paste text to check for watermarks
  2. Review report on found hidden marks
  3. Use the clean button to remove marks

Use Cases

  • Scan AI-assisted drafts before publishing guest posts.
  • Detect hidden characters in UGC and comments.

Limitations

  • Analyzes plain text input, not binary DOC/PDF files.
  • Heuristic detection: suspicious symbols are not always malicious.

Example Input / Output

Example Input
Page text containing invisible Unicode markers.
Example Output
Detected 3 suspicious symbols (U+200B/U+2060) and generated a cleaned variant.

FAQ

These are hidden characters invisible during normal viewing: zero-width spaces, homoglyphs (Cyrillic "a" instead of Latin), special Unicode characters. They are used for leak tracking and copy identification.

Hidden characters can cause problems: content duplication in search engines' eyes, incorrect on-page search, text copying issues, layout disruption.
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Why check for watermarks?

Some AI services and content protection systems embed invisible watermarks in text. These can be zero-width characters, homoglyphs (similar letters from different alphabets) or statistical patterns. Our detector finds all 5 types of watermarks and allows text cleaning.