A confidential document is about to be shared. Choose a recipient, and Qmark will embed an invisible watermark before delivery.
Watermark Embedded
This text appears identical to the original. The watermark is invisible.
Fingerprint Metadata
Detect Watermark
Watermarked content was found online. Paste it below to identify the source.
Detection Result
How It Works
Qmark uses a multi-layered approach to embed invisible identifiers into text content.
Zero-Width Characters
Invisible Unicode characters (U+200B, U+200C) are inserted between words. Each character encodes a single bit. Completely invisible in browsers and most editors.
Survives: copy-paste, text extraction
Homoglyph Substitution
Specific Latin letters are replaced with visually identical characters from other Unicode blocks (e.g., Latin 'a' becomes Cyrillic 'a').
Survives: OCR, screenshots, visual inspection
Whitespace Variation
Bits are encoded in trailing whitespace at line-ends. Single trailing space = 0, double trailing space = 1.
Survives: PDF extraction, HTML rendering
Embedding Workflow
User Request→Qmark Middleware→Fingerprint Generated→Watermark Embedded→Content Delivered