Transparent background
A transparent PNG or WebP places only the stamp over document text and lines without a white box.
PDF STAMP & SIGNATURE
Add a Stamp or Signature to PDF
Paste a transparent stamp or signature image, or sign directly, and place it on any PDF page.
01
Prepare the PDF and Stamp or Signature
Files are not uploaded and are processed only in your current browser.
Choose a PDF file.
Choose a transparent stamp image or bring one from Stamp Maker.
Create a Signature for the PDF
Sign with a mouse or finger to use it as a transparent image.
Sign in this area
02
Place the Stamp on a Page
Select a page, add the stamp, then adjust its position and size.
The editor appears after both the PDF and stamp image are loaded.
Stamp imageTransparent background recommended
Choose a PDF Page
Select a page for the stamp. The number shows how many stamps are placed.
Save note Only stamped pages are rebuilt as image-based pages. Existing links and text selection may be lost on those pages.
Finished Placing Stamps?
Open the generated PDF, then use your browser's download button to save it.
PDF RESULT
PDF with Stamp and Signature
Review and download the result below, or continue to the PDF text editor.
PDF STAMP GUIDE
Add a Stamp Image to a PDF and Save a New File
The PDF stamp tool places transparent PNG or WebP stamps on contracts, confirmation forms, quotes, and other documents requiring a seal. Choose a page, position the stamp, adjust size, opacity, and rotation, and save a new PDF without installing software.
How to Add a Stamp to a PDF
- Choose the PDF to stamp.
- Choose a transparent PNG or WebP stamp, or bring one from Stamp Maker.
- Choose a page, add the stamp, and drag it to the desired position.
- Adjust size, opacity, and rotation, then choose Open stamped PDF to view the result.
PDF Stamp Placement Checklist
- Confirm that the document and stamp names match
- Position and size the stamp without obscuring the signature or seal field
- Confirm that the receiving organization accepts electronic stamp images
- Review every page in the generated PDF, then download it
What to Know Before Adding a Transparent PNG Stamp to a PDF
Size and clarity
A large stamp image stays clearer when scaled down proportionally. Avoid enlarging a very small source image.
Document review
Electronic stamp acceptance and signature requirements vary. Check the other party's or organization's requirements for important contracts and submissions.
Frequently Asked Questions
Are the PDF and stamp image uploaded to a server?
No. No. Reading the PDF, placing stamps, and creating the new PDF all happen in your browser. Your files are not sent to or stored on Congdy Coding servers.
Which image format should I use for a stamp?
Use a PNG or WebP image with a transparent background. Stamps from the online maker can be transferred directly or downloaded as transparent PNGs.
Can I add stamps to multiple pages?
Yes. Yes. Select a page and add the stamp repeatedly to use it on multiple pages. You can also place multiple stamps on one page.
Can I change the stamp position and size?
Yes. Yes. Drag the stamp with a mouse or finger, then use the size, opacity, and rotation sliders.
Does text selection remain available in a stamped PDF?
Unstamped pages keep their original structure. Stamped pages are rebuilt as image-based pages for accurate output, so existing text selection and links may be lost on those pages.
This tool and guide are reviewed directly by Congdy Coding, operated by a developer with eight years of experience. Last updated: October 5, 2026