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Sign & Stamp PDF

Place a picture of your signature and company stamp on every page of a PDF, or only on the pages you choose, and download the result.

Choose a PDF

Or drop it here. You then add your signature and stamp images.

Your files stay on this device. The work is done in your browser; nothing is uploaded to us.

This places a picture of your signature and stamp on the page, like signing a printout and scanning it. It is not a digital signature. Where a portal asks for a digitally signed document, you still need your Digital Signature Certificate (DSC).

How it works

  1. Choose the PDF you need to sign and stamp, for example the tender document or your filled bid forms.
  2. Add a picture of your signature, a picture of your company stamp, or both. PNG and JPG images work.
  3. Pick the pages (every page unless you change it), the corner, the size and how far from the page edge they should sit.
  4. Press the button. A new PDF downloads with the images on the pages you chose. Open it and check a few pages before uploading.

Good to know

  • With both images, the signature comes first and the stamp sits beside it. They are never placed on top of each other.
  • A JPG has a solid background, usually white, which hides whatever is under it. Use a PNG with a clear background, or move the images to an empty part of the page with the position and distance settings.
  • The text and pages of your PDF are not changed. If the PDF already carries a digital signature, adding anything to it, including these images, will make that signature show as no longer valid.

Common questions

Is this a digital signature?
No. The tool places a picture of your signature and stamp on the page, the same as signing and stamping a printout and scanning it. It does not use a Digital Signature Certificate (DSC) and does not prove who signed. Where a portal or a tender asks for a digitally signed document, or for the bid to be submitted with a DSC, you still need your DSC.
Why is "every page" the default?
Many tenders ask the bidder to sign and stamp each page of the bid, and often each page of the tender document, to show the terms are accepted. Doing that by hand means printing, signing, stamping and scanning hundreds of pages. Read what your own tender asks for and who must sign; the tender document decides.
What image should I use for the signature and stamp?
A PNG with a transparent background is best, because the text under it stays visible. A photo or scan on white paper (JPG) also works, but its white background covers what is beneath it, so place it on an empty part of the page. Crop the image close to the signature or stamp so it is not shrunk by the empty space around it.
Is the original file changed?
No. A new PDF downloads with "-signed", "-stamped" or "-signed-stamped" added to the name. The file you chose is left as it is, and the text in the new file can still be selected and searched.
Are my documents and signature uploaded anywhere?
No. The PDF and the images are read inside your browser, on your own device. Nothing is sent to Bidkoo or to anyone else, and the images are not kept after you close the page.

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