How to Sign a PDF Online (No Printer, No Scanner)
Signing a PDF used to mean printing it, signing with a pen, and scanning it back in — which is slow, and often produces a blurry, crooked image. An electronic signature skips all of that: you place a signature on the page and download the finished file in a couple of minutes.
Here is how to sign a PDF online, and what kind of signature you actually need.
What "signing a PDF" really means
There are three different things people mean by this, and they are not interchangeable:
- A drawn or typed signature image — your signature placed on the page as a visual mark. This is what most everyday documents need: contracts, offers, consent forms.
- A digital signature (certificate-based) — a cryptographic signature bound to a certificate, used where tamper-evidence matters (regulated filings, some government portals).
- A signature field in a form — a clickable field baked into the PDF that a signer fills in.
The tool on this site does the first one: it stamps a signature image onto your PDF. That covers the vast majority of business and personal paperwork. If a counterparty specifically demands a certificate-based signature, they will usually tell you and provide their own portal.
Step by step: sign a PDF
- Open the Sign PDF tool.
- Upload the PDF you need to sign.
- Create your signature — type it, or draw it with a mouse or finger.
- Place it on the page, size it, and move it where the signature belongs.
- Download the signed PDF.
No account setup is needed to see how it works, and the file is deleted from the server after the task finishes.
Is an electronic signature legally valid?
In many jurisdictions, yes — the US ESIGN Act and the EU's eIDAS regulation both recognize electronic signatures for most commercial agreements. But validity depends on the document type and local law: wills, some court filings, and certain real-estate documents often require specific formalities.
This is general information, not legal advice. If the document matters legally, check what the receiving party requires. If they say "wet ink only", no software will change their mind.
Sign first, then protect
A common workflow: sign the document, then lock it so it cannot be edited afterward. Our Encrypt PDF tool adds password protection, and Flatten PDF bakes annotations into the page so they cannot be moved.
If you are assembling a signed pack — a contract plus exhibits — merge the PDFs after everyone has signed, then sign the cover page last.
Tips that save rework
- Sign the right version. Sign the final PDF, not the draft that still has tracked changes.
- Keep the signature proportionate. A signature that covers half the page looks wrong and can obscure text.
- Check the page count after signing. Some tools re-render the file; a quick scroll confirms nothing shifted.
- Send the signed file, not a link that expires. Recipients archive documents; expiring links break that habit.
Related guides
- What Does Flattening a PDF Mean? — flatten next so the signature cannot be moved.
- How to Add Page Numbers to a PDF — usually the other edit a signed contract needs.
- How to Unlock a PDF — locked files cannot be signed.
FAQ
Can I sign on my phone? Yes — the tool runs in the browser, and you can draw a signature with a finger.
Does signing change the text in the PDF? No. The signature is added as a layer; the original text and layout stay intact.
Can someone remove my signature later? A stamped signature is not tamper-proof. If you need tamper-evidence, use password protection or a certificate-based digital signature.
Do you keep my document? No. Files are deleted after the task completes.
Ready to sign? Open the Sign PDF tool and finish the document in a couple of minutes.