Law firms label drafts "PRIVILEGED AND CONFIDENTIAL" before circulation; agencies stamp "SAMPLE" on training PDFs; photographers embed subtle logos on proofs. Watermarks signal status without hiding underlying content.

Siliph Watermark PDF lets you set opacity, rotation, font, and tile spacing in the browser so watermarks stay readable on screen but do not obliterate tables. Image watermarks support PNG logos with transparency.

Tiled watermarks repeat across large architectural sheets where a single corner mark could be cropped out. Lighter opacity preserves OCR accuracy when you still need searchable text beneath the stamp.

Encrypted uploads protect unreleased creative work during processing. Files auto-delete within two hours on the free tier, and watermarking requires no Siliph signup.

Use Protect PDF alongside watermarks when you must also block editing, or Flatten PDF to bake watermarks into a non-interactive snapshot for clients.

Siliph security tools—password protection, unlocking, redaction, and watermarks—process inside an encrypted browser session so sensitive PDFs stay protected in transit. We delete your files within two hours on the free tier and never gate basic protection behind signup.