How to sign a PDF: every option explained

"Just sign the PDF and send it back." Simple enough — until you realise "sign" can mean at least four different things, from typing your name in a box to attaching a cryptographic certificate. Most of the time you need the easy version. Occasionally you need the serious one. Knowing which is which saves you from both overkill and under-doing it.

This guide walks through every common way to sign a PDF, what each actually is, and when it's the right choice.

First, what "signing" usually means

For the vast majority of everyday documents — a consent form, a rental agreement, a school form, a freelance contract — signing a PDF means placing a visible signature on the page and sending it back. This is an electronic signature, and there are three easy ways to do it.

1. Draw your signature

You draw your signature with a mouse, trackpad or — easiest of all — your finger on a touchscreen. It looks handwritten and takes seconds. It's the most natural-feeling option and perfectly suited to everyday agreements.

2. Type your signature

You type your name and it's rendered in a signature-style font. It's the fastest option and completely legible. Some people feel a typed signature looks less "real" than a drawn one, but in terms of showing intent to sign, it does the same job.

3. Upload an image of your signature

You sign a piece of paper, photograph or scan it, and place that image on the PDF — or reuse a signature image you've saved. This gives you a consistent, genuine-looking mark every time, which is handy if you sign documents regularly.

With RaptorPDF's Sign tool you can do all three — draw, type or upload — then drag the signature to exactly where it belongs, resize it, and download. It runs in your browser, so a private contract is never uploaded to a server.

The serious version: digital signatures

There's a stronger, more technical thing that shares the name: a digital signature. Instead of just showing a mark on the page, it uses a cryptographic certificate to mathematically bind your signature to the document's contents. If a single character changes afterwards, the signature breaks and the tampering is detectable.

Digital signatures are what you'd use for legally sensitive or high-trust contexts — certain business, government or financial documents. They usually require a certificate from a trusted authority (or a service that manages one for you), and both sides need software that can verify it. It's more setup, for a much stronger guarantee of authenticity and integrity.

Electronic vs digital, in one line

All digital signatures are electronic signatures, but not all electronic signatures are digital. An electronic signature shows intent; a digital signature adds cryptographic proof. For most people, most of the time, the electronic kind is exactly right.

Which one do you need?

• Everyday forms and agreements — draw, type or upload a signature. Fast, free, and recognised for most purposes.
• You sign a lot — save a signature image and reuse it for a consistent mark.
• High-value, regulated or disputed documents — consider a proper digital (certificate-based) signature, or a dedicated e-signature service with identity verification and an audit trail.

A note on filling forms first

Signing often comes at the end of filling out a form. If your PDF has interactive fields, complete them first with a form filler; if it's a flat form with no clickable fields, you can type directly onto it with the text tool, then add your signature. Doing both in one place saves a round trip.

Frequently asked questions

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