PDF Signer

Open PDF Open PNG Stamp Page Stamp size 180px

How to use

Open a PDF.
Open a transparent PNG signature, initials, stamp, or seal.
Enter the page number you want, click “Add stamp to page”, then drag it into place.
Use the size slider for the selected stamp.
Try “Save signed PDF” first. If the output is corrupt, use “Save flattened PDF”.

Note: browsers cannot silently overwrite local files for security reasons. This saves a new signed PDF. In Chrome/Edge, choosing the same filename may let you replace the original through the save dialog.

Flattened save: rebuilds the PDF from the rendered pages. It is more reliable for encrypted or malformed PDFs, but text becomes non-selectable image content.

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