How to Sign a PDF for Free (No Account, No App)

Printing a page just to sign it and scan it back in is one of those tasks that survives long after it stopped making sense. Here's how to add a real signature to a PDF without leaving your browser.

When you'd need to sign a PDF

• Countersigning a contract, lease, or NDA someone emailed you
• Adding your signature to a form before submitting it online
• Signing off on a quote or agreement without a scanner nearby
• Adding an initial or short mark to specific pages of a longer document

How to sign a PDF step by step

1. Open Sign PDF.
2. Drop in the PDF you need to sign.
3. Use the page navigation to get to the page that needs your signature.
4. Draw your signature with a mouse, trackpad, or finger — or switch to typing your name in a handwriting-style font instead.
5. Adjust the size of the signature, then drag it into position on the page.
6. Download the signed PDF.

Tips for signing cleanly

Drawing on a trackpad looks better than you'd expect. A mouse-drawn signature can look shaky, but a laptop trackpad or a phone screen usually produces something close to a real signature — worth trying before settling for the typed option.

Typed signatures are the faster, more legible option. If the document is informal or you just need something readable rather than stylized, typing your name is quicker and avoids an awkward mouse-drawn scrawl.

Clear and redo it if it doesn't look right. There's a clear button on the signature pad — use it rather than signing over a bad first attempt, which usually looks worse layered together.

Check placement before downloading. Because the signature is placed by dragging rather than snapping to a fixed line, zoom in on the final position to make sure it's sitting on the signature line and not overlapping text.

Sign PDF vs. Fill PDF Form — which one do you need

If the PDF has actual fillable fields — the kind where you can click into text boxes throughout the form — Fill PDF Form is the better starting point, since it walks you through every field, not just a signature. Sign PDF is for the more common case: a plain PDF, like a lease or a signed-off quote, where you just need your mark added to specific pages and the file has no interactive fields at all.

FAQ

Is a signature added this way legally binding? In most contexts, yes — courts and most institutions accept electronic signatures under e-signature laws like the U.S. ESIGN Act, provided both parties intended to sign electronically. For documents with specific notarization or witnessing requirements, check what that document actually needs first.

Does this work for documents where I need to sign more than once? Yes — place a signature on one page, then navigate to another page and place it again; each placement is independent.

Can I use this on my phone? Yes — drawing a signature with a finger on a phone screen works the same way as a trackpad or mouse on desktop.