UD Highlight
Structural document highlighting that travels with the file. Unlike PDF annotation layers — which any reader can strip in seconds — UD highlights are embedded in the document metadata itself, tamper-evident and inseparable from the content.
How UD Highlight differs from PDF annotations
PDF highlights in Adobe Acrobat, Word track changes, and browser annotations all sit on top of the document as a removable layer. Any reader can flatten, strip, or delete them. UD highlights are encoded in document metadata — removing them breaks the seal.
PDF annotation layers can be removed in one click in any reader. A UD structural highlight is part of the document seal — removing it changes the integrity hash.
Share a highlighted .uds via email, upload, or print — the highlight data travels with it. No separate annotation file. No sync required.
Each highlight carries a label ("Key clause", "Action required") embedded in metadata. Legal and compliance teams can extract all highlights programmatically.
Choose from five named colours with semantic intent. Unlike PDF where colour is purely visual, UD highlight colours are named and stored structurally.