How to Sign a PDF on Your Phone or Computer

Guide · 2 min read · updated 2026-10-16 · Leer en español

There's no need to print, sign by hand, and scan anymore. You can sign a contract or a form in seconds right from your screen.

How to Sign a PDF on Your Phone or Computer

Visual signature vs. digital signature

A visual signature is an image of your signature placed on the document. It's enough for many informal procedures; for processes that require digital certificates, you need a specific e-signature service.

Step by step

Open the PDF, go to Sign PDF, draw your signature with your finger or mouse, place it, and adjust its size. Save the document.

Tips

Save your signature to reuse it, and always send the final PDF, not the original. If the document has several signatures, place them all before saving.

How to get a clean signature

Sign on a clean screen with one continuous stroke. On a phone, use your finger or a capacitive stylus; on a computer, a mouse or a graphics tablet. If you don't like the result, erase it and try again: there's no limit.

Make your signature a bit bigger than usual; when you place it you can shrink it without losing sharpness, but enlarging it makes it blurry.

Where to place the signature

Put it on the document's signature line, without covering the text. If the document needs several signatures, place them all before saving so you don't end up with several versions.

If you need to sign and also date it, add the date with the text tool next to the signature.

Visual signatures and legal validity

A visual signature shows your approval, but it doesn't include a digital certificate proving your identity. In Colombia, the law recognizes different types of electronic signature; for contracts with special requirements, check which mechanism is required and use a certified signature provider if needed.

Try it now, free
Do it on your device: your files are never uploaded to any server.
Use Sign PDF

Frequently asked questions

Is it a certified digital signature?

It's a visual signature; on its own it doesn't replace a certified digital signature.

Is my signature saved?

Only on your device, if you choose to save it.

Is it free?

Yes.

Can I sign on my phone?

Yes, on iPhone and Android with your finger.

Is my signature stored anywhere else?

Only on your device, and only if you decide to save it.