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UD Steganographic Watermark
ProFree during beta
Embed an invisible ownership mark in any Universal Document™. The mark is undetectable without UD Validator — but irrefutably proves original ownership. Record your ownership hash after embedding.
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Drop your .uds file
or click to browse
Mark detectable by UD Validator. Runs in your browser. Part of the Universal Document™ ecosystem.
How UD Steg Watermark differs from visible watermarks and DRM
Visible watermarks degrade the document and are stripped easily. DRM prevents access entirely. UD Steg Watermark proves ownership without affecting how the document looks or reads.
Visible watermark overlaid on content
Degrades readability and is removed in seconds with a screenshot, crop, or background-removal tool. Provides no cryptographic proof — just a visual deterrent that sophisticated infringers ignore.
DRM / locked document
Prevents viewing without authorisation — but also prevents legitimate sharing, printing, and archival. Creates friction for authorised recipients and fails completely if the DRM platform shuts down.
UD Steg Watermark — invisible SHA-256 mark
A SHA-256 hash of your ownership claim is embedded in the document's structured metadata, invisible to readers. The document reads and shares identically to an unmarked version.
UD Steg Watermark — UD Validator verification
Any copy of the document — however it was distributed or renamed — can be verified in UD Validator. The embedded mark either matches your ownership claim or it doesn't. No dispute, just a hash comparison.