Tax worksheets, medical imaging reports, and cap-table extracts should not travel as unencrypted attachments anyone can forward. Password protection uses standard PDF encryption recognized by Adobe Reader and mobile viewers worldwide.

Siliph Protect PDF sets user and owner passwords in the browser-backed workflow with encrypted uploads. Permission toggles let you allow printing for counsel while blocking text extraction, or vice versa for read-only board packs.

Share passwords through a separate channel—SMS or password manager—never in the same email as the file. Recipients without the password cannot preview content, which some portals require you to disclose when uploading to their systems.

Files auto-delete within two hours on the free plan, and protecting a PDF requires no signup. Use Unlock PDF only when you hold legitimate rights to remove restrictions you or your organization applied earlier.

Watermark PDF complements protection by marking visibly who received a copy, deterring leaks even if someone photographs the screen.

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.