Signing a PDF: drawing a signature, placement, and is it legally binding?
Signing a PDF is a daily task for many people, yet the word "signature" covers two very different things. Most people mean the familiar one: put your handwritten-style signature on the document. That is what this guide covers.
The distinction matters when someone asks for a "digital signature", because the same word can mean a drawn mark or a certificate-based cryptographic signature. Understanding which one you need saves you from embarrassing and possibly costly confusion.
Two kinds of signatures
| Type | What it is | When it is used |
|---|---|---|
| Drawn signature | Your handwriting as an image on the page | Everyday documents, agreements, approvals |
| Cryptographic signature | Certified digital seal with a certificate | Regulated workflows, e-invoicing, some contracts |
This tool provides the drawn kind: draw with mouse or touch, or upload a signature image, and place it on the page. It does not pretend to issue certificates, because a certificate requires a trusted authority and cannot be faked by a browser tool.
Drawing your signature
The signature pad accepts mouse, touch and pen input. Draw slowly and keep the signature within the pad, then confirm. If you prefer your real signature, upload a photo of it on white paper; the tool crops and places it as a clean stamp.
- Sign on a plain, light background for the cleanest cut-out.
- Avoid signing on lined or patterned paper unless unavoidable.
- Check the saved signature once — a bad signature stamps every copy.
Placing the signature
Choose the page and position before stamping. Signatures conventionally sit at the end of the document, above the name line, but contracts may specify a particular page. Some tools allow you to move the signature after placing; if not, re-run with the corrected position.
What signing does to the file
The signature becomes part of the PDF page content. The file grows slightly, the signature prints with the page, and the document remains a normal PDF that anyone can open. No external service is involved and no certificate is embedded.
When you need a cryptographic signature instead
- The counterparty explicitly asks for a "digital signature with certificate".
- The workflow is regulated (e-invoicing, certain government filings).
- You need tamper-evidence that a drawn mark cannot provide.
- A platform requires acceptance through its own signing flow.
Checking the signed document
- Open the output and confirm the signature is on the correct page.
- Check the position: it should sit on, not over, the signature line.
- Verify the signature is legible at print size.
- Confirm no other content was moved or covered.
Signature etiquette and placement
A signature is more than a mark — it is a commitment, and its placement communicates intent. Sign above or directly on the printed name line, at the end of the document unless the form instructs otherwise. In contracts, signing each page or initialling changes is a common practice that a reader expects; in simple agreements, a single signature at the end suffices.
- Signature lines: place the mark above the line, on the name printed below it.
- Multi-page agreements: sign the final page; initial other pages if the counterparty asks.
- Witness lines: leave them for the witness — do not sign on their behalf.
- Dates: add the date next to your signature where the form asks for it.
The difference between a copy and the original
When you sign a PDF, you are signing a digital copy — the same file can be signed repeatedly and each signed version is its own document. Unlike a pen signature on paper, there is no single physical original. For most purposes that is fine: what matters is that the signed file you send is complete and unchanged apart from your signature. If the counterparty needs evidence of integrity, they will ask for a certified digital signature, which is a different mechanism entirely.
Frequently asked workflow questions
A few practical questions come up again and again. Can two people sign the same file? Yes — each person signs their own copy, or you merge two signed versions into one document. Can a signature be removed if you make a mistake? Re-run the tool and place the signature correctly — the new signed file replaces the old one. Does signing work on a form you have already filled? Yes — fill the form first, then stamp your signature on the signature line, and the completed document is ready to send.
- Two signers: sign separate copies or merge signed versions.
- A mistake: re-run and place the signature again.
- A filled form: fill fields first, then add the signature.
- A witness: leave the witness line for the witness to sign.
Privacy
Your signature is drawn and stored only in your browser session. The document and signature are combined locally and the signed file is generated on your device. Nothing is uploaded to any server.