Overlay PDF Online Free: Stamp Letterhead or Watermark
Stamp one PDF over or under another: letterhead, watermark page, or form template on every page.
Put company letterhead behind a plain contract, stamp a DRAFT or CONFIDENTIAL page over a report, or lay a filled document onto a blank form template. Load a base PDF and an overlay PDF, pick over- or under-content placement, opacity, fit or actual size, and a page range. A live preview shows exactly how base page 1 and overlay page 1 composite before you download.
How to Use It
- Load a base PDF and an overlay PDF and wait for the local preview to load.
- Adjust the settings: Adjust the available settings and run the tool locally in your browser.
- Download the result: Download the processed file directly to your device.
Frequently Asked Questions
What can I use as the overlay?
Any PDF: a letterhead, a one-page watermark or DRAFT stamp, a certificate frame, or a form template. The overlay is embedded as vectors, so its text and graphics stay sharp. Nothing is rasterized.
What is the difference between over and under content?
Over draws the overlay on top of the base page. Right for stamps and watermarks. Under places it behind the page's text, like printing on letterhead. Under mode rebuilds each stamped page, so links and form fields on those specific pages are removed; pages outside the range keep everything.
Can I use a multi-page overlay?
Yes. Choose Page 1 on every page to repeat the overlay's first page across the whole range, or In sequence to stamp overlay page 1 on the first selected page, page 2 on the second, and so on. Stamping stops when the overlay runs out of pages.
Are my PDFs uploaded anywhere?
No. Both files are processed entirely in your browser with pdf.js and pdf-lib. Neither the base nor the overlay PDF ever leaves your device.