◆ ClientPDF
running locally in this tab — nothing uploaded

Open DevTools.
Number every page.
Watch nothing get sent anywhere.

Stamp page numbers onto a PDF — pick the corner, the starting number, and whether to skip the cover page — all inside this tab. Zero network requests after the page loads, same rule as every other tool here. Check the Network tab yourself.

⇣

Drop one PDF here or click to browse

One file at a time · stays on this device

    0 network requests since page load · verified live, not our word for it

    No accounts

    No signup, no email, no watermark. Use it and close the tab.

    No limits (for now)

    Number as many pages as your device's memory allows. No artificial caps.

    Rotating or compressing a PDF? Both live too.

    Fix pages scanned sideways, drag pages into a new order, or shrink the file size — same rule: everything stays local. Leave your email and we'll let you know about a Pro batch mode.

    Numbers landing sideways or in the wrong corner? Here's why, and the fix.