Sign PDF
Add your signature image to a PDF document.
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
About Sign PDF
This places a signature image onto a page. It is worth stating plainly that this is not a digital signature in the cryptographic sense — it adds a picture of your signature as page content, with nothing binding it to your identity and nothing detecting later alteration. For most everyday paperwork that is exactly what is being asked for, and it is far quicker than printing, signing and rescanning. For anything requiring legal non-repudiation, you need a certificate-based e-signature service instead.
When to use Sign PDF
Returning a form without a printer
The print-sign-scan cycle exists only because the signature has to become part of the page. Placing an image does the same thing in seconds.
Initialling routine paperwork
Delivery notes, internal approvals and acknowledgements where a visible mark is all that's needed.
Adding a signature block to a template
Applying the same signature to documents you issue regularly.
Limitations worth knowing
- This is not a cryptographic digital signature. There is no certificate, no identity binding, and no tamper detection.
- The image can be extracted from the PDF and reused by anyone who receives the file — a real consideration for a genuine signature.
- A JPEG signature carries a white box around it. Use a transparent PNG so it sits cleanly over the line.
- Nothing is timestamped, so the document does not record when it was signed.
How to sign pdf
- 1
Load the PDF you need to sign.
- 2
Add your signature image — a photo of a signature on white paper works, ideally with the background removed as a transparent PNG.
- 3
Position and size it over the signature line.
- 4
Download the signed document.
Frequently asked questions
Is this a legally binding electronic signature?+
It depends entirely on your jurisdiction and the document, and you shouldn't assume it is. Many routine agreements accept a signature image, but anything requiring proof of identity or tamper-evidence needs a certificate-based service that binds the signature to a verified identity and detects later changes. This tool adds an image; it makes no cryptographic claim.
Why does my signature have a white box around it?+
Because the image has an opaque background — the usual result of photographing a signature and saving it as JPEG. Use a PNG with a transparent background so only the ink shows and the underlying line stays visible.
Can someone copy my signature out of the PDF?+
Yes. Once placed, it's an image inside the file and can be extracted and reused. That's true of every signature-image tool, not just this one, and it's the strongest practical argument for certificate-based signing when the document actually matters.
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