Editing & Signing
How to Add a Seal or Stamp Image to a PDF
Add a seal or stamp image to a PDF for an official look. Upload a transparent PNG, size it, place it per page. Free, in-browser, private.
Hamza M.
PDF Workflow Editor
A round official seal, a company stamp, an approval mark — adding an image like these to a finished PDF is a common finishing step before a document goes out. The Sign PDF tool treats an image exactly like a signature: you upload the stamp file, place it on the page, size it, and download the result. No digital signature certificate is involved — it is a visual mark on the page.
What a stamp image actually is
An image stamp is a picture drawn over the page. Your uploaded PNG or JPG is placed at a position you choose, scaled to a size that suits the document, on the page you select. It behaves like a rubber stamp laid on the paper — it covers what is below it, so place it over a clear area of the page.
Add a seal or stamp to a PDF, step by step
- 1Open the Sign PDF tool and drop in your file.
- 2Choose the image option and upload your seal or stamp as a PNG.
- 3Adjust the size with the scale control so the stamp fits its spot without dominating the page.
- 4Place the stamp where you want it on the current page, then repeat on any other pages that need it before downloading.
Because each placement is on a specific page, the same stamp can sit on page one and on an approval page later in the document — you just drop it in both places with the same image file.
Preparing a clean stamp image
- Use a PNG with transparency so only the seal itself covers the page.
- Export at a sensible resolution — a massive scan becomes pixel-heavy when shrunk; aim for the size it will print at.
- Keep the file lightweight; a small image places instantly and keeps the PDF lean.
One page, every page, or a watermark?
Stamps and seals are page-level marks, so place them where they belong — usually the cover, an approval page, or a certification line. For continuous background branding such as a corner logo or DRAFT label across every page, a watermark is the right tool instead, because it repeats for you. A hand-placed seal is about a specific official spot, which is exactly where the stamp belongs.
Do it now
Sign PDF
Add digital signatures to PDFs. It runs in this browser tab — your file is not uploaded anywhere.
Open Sign PDFFrequently asked questions
Does an image stamp make the PDF legally official?+
A placed image is a visual mark on the page — it does not carry the cryptographic proof or verification process of a notary. It works for brand presence and internal approval; an officially notarized stamp requires the notary's own physical or digital notarization process.
Will the stamp look boxy or pixelated?+
Only if the source has a background or too little resolution. Use a transparent PNG, size it with the scale control, and export at the size it will print at — then it reads like a real seal.
Can I put the same stamp on several pages?+
Yes. Upload the image once, then place it on each page that needs the mark, sizing each placement to fit. The tool works page by page.
What is the difference from a watermark?+
A watermark is applied automatically to every page for continuous branding. A stamp is placed by hand at a specific spot on specific pages — an official corner, an approval block, a cover page.
Can I remove a stamp I placed by mistake?+
Re-run the flow: reopen the file the same way and place the corrected stamp, or re-export from your last good download. Placement is part of the page you save.