FastHan / PDF Tools / Overlay PDF Online Free
PDF OVERLAY
Overlay PDF Online Free
Stamp one PDF onto another — a letterhead, a form, or a signature page.
100% private — processed in your browser
Your files are processed locally in your browser with JavaScript. They are never uploaded to a server. You can verify this yourself: open your browser DevTools, go to the Network tab, and watch — no file data leaves your device.
How to overlay one PDF onto another
A letterhead, a "DRAFT" stamp, or a form background usually lives in its own PDF, and the document it belongs on lives in another. This tool puts one on top of the other: the first file you add is the base document, the second is the overlay, stamped onto its pages and scaled to fit each page.
Drop both PDFs and choose how the overlay repeats: the first overlay page on every base page (for a letterhead or a stamp), or matching page numbers (overlay page 1 on base page 1, and so on). The opacity slider lets the overlay sit faintly underneath the text like a watermark, or at full strength like a real stamp.
One honest limit: the overlay is drawn as a full page on top of the base page, so where it is opaque it covers what is underneath. It cannot edit or move the base document's own text — if the overlay covers a line, that line is hidden in the result. Check the output before you share it.
Everything runs in your browser, so both documents never leave your device. There is no daily limit.
How to use this tool
- 1Drop two PDFs: first the base document, then the overlay.
- 2Choose repeat-on-every-page or matching page numbers, and set the opacity.
- 3Press Overlay PDF, then download the stamped PDF.
Frequently asked questions
Which file is the base and which is the overlay?
The first file you add is the base document; the second is the overlay stamped on top of it. You can reorder the files with the up and down arrows in the file list.
Will the overlay cover my text?
Where the overlay is opaque, yes — it is drawn on top of the base page. Use the opacity slider to make it faint, like a watermark, or keep it at full strength for a letterhead or stamp that sits in the margins.
What is the difference between the two overlay modes?
Repeat puts the first overlay page on every base page — right for a letterhead or a DRAFT stamp. Match puts overlay page 1 on base page 1, overlay page 2 on base page 2, and so on; base pages without a matching overlay page are left alone.
Does the overlay change the page size?
No. The base document keeps its own page size, and the overlay is scaled to fit each base page.
Are my files uploaded anywhere?
No. The overlay is applied entirely in your browser. Both PDFs never leave your device.