Every technique, and what we can do about each

Two unrelated things get called AI watermarks. One is a statistical signature woven into word choice, which no tool can strip. The other is characters that ended up in your text by accident, which is what this app removes. This page keeps them apart.

• SynthID-Text: the watermark that is not a character
• Zero-width space, U+200B
• Zero-width joiner, U+200D
• Zero-width non-joiner, U+200C
• Word joiner, U+2060
• Narrow no-break space, U+202F
• No-break space, U+00A0
• Soft hyphen, U+00AD
• Byte order mark, U+FEFF
• Non-breaking hyphen, U+2011
• Bidirectional controls, U+200E to U+2069
• Unicode tag block, U+E0000 to U+E007F
• Variation selectors, U+FE00 to U+FE0F
• Dashes: U+2014, U+2013 and the rest
• Curly quotes and prime marks
• Horizontal ellipsis, U+2026
• Exotic spaces: en space, em space, thin space and the rest
• Control characters: C0, DEL and C1
• Replacement character, U+FFFD
• C2PA Content Credentials
• Stylometric fingerprints