Tool category
Protect and sign PDF files
You can protect PDF files, unlock PDF passwords, sign PDFs, add certificate security, or apply watermarks, bates numbers, and page numbers before you share. This category groups every finishing tool you need to protect PDF documents — password protection for private recipients, unlock for PDFs you already hold a password for, certificate signing for auditable delivery, and preflight validation for accessibility or archival handoff. Your protected files are built in the browser, and no hidden account or hosted queue is required. When you still need to edit, compress, or convert first, the related tool links keep the next step close.
Protect and prepare tools
Lock down finished PDFs or add numbering before the final export.
Unlock PDF with a Password
Unlock a password-protected PDF online by entering the password you already have, then save or download the unlocked copy.
Add Watermark to PDF Online
Add a text or image watermark to a PDF online with presets, page-range controls, placement tuning, and in-browser export.
Protect PDF with a Password
Protect a PDF online by opening the editor with password controls ready, then export a locked copy with permissions in place.
Create PDF Bookmarks Online
Create or replace PDF bookmarks online with a reviewable outline plan, explicit source labels, and writeback that leaves visible pages unchanged.
Check PDF Standards and Fix Common Issues
Run PDF standards checks online with named archival, print, and accessibility profiles, then apply the browser-safe fixups Pdf Clarity can support honestly.
Certificate Sign, Certify, and Validate PDF
Apply certificate-backed PDF signatures, certify restriction states, and inspect trust or tamper results in a dedicated in-browser security workflow.
Add Headers and Footers to PDF
Add headers, footers, and page-count tokens to PDFs online with previewed placement and explicit page-range controls.
Add Background to PDF
Apply text or image background overlays to PDFs online with placement preview, opacity controls, and selected page ranges.
Add Bates Numbering to PDF
Apply legal-style Bates numbering to one or more PDFs online with deterministic continuation, prefix controls, and previewed placement.
Add Page Numbers to PDF
Add page numbers to a PDF online with controls for position, format, size, and starting number already ready.
Frequently asked questions
Category-specific answers so you can pick the right tool before you upload. Tap any question and the answer expands inline.