How to Sign a PDF Online for Free

Most PDFs that need a signature don't need a full e-signature platform with audit trails and multi-party workflows. A rental agreement, consent form, offer letter or NDA usually just needs your signature on the right line before you send it back. For that, printing, signing, scanning and emailing is a 20-minute ritual you can replace with a two-minute one. This guide covers the ways to sign a PDF, how to make the signature look right, what the law generally says, and when you need something stronger.

Three ways to create your signature

• Draw it: use a mouse, trackpad, stylus or your finger on a phone. It looks the most natural with a stylus or touchscreen. With a mouse, sign a little larger than feels natural and it will look smoother once scaled down.
• Type it: type your name and it is rendered in a script-style font. It is the fastest option and fine where the signature is a formality, such as an internal approval or an acknowledgement.
• Upload an image: sign a sheet of plain white paper with a dark pen, photograph it in good light, and upload the photo. This gives the most authentic look, because it is your real ink signature.

How to sign a PDF

1. Open the Sign PDF tool and add the document that needs your signature.
2. Create your signature: draw, type or upload an image.
3. Drag it onto the signature line, and resize it so it sits naturally in the space, roughly the height of two lines of text.
4. Apply it and download the signed PDF.

Signing happens in your browser, so the document never leaves your device. That matters, because the documents people sign tend to carry addresses, salaries, ID numbers and bank details.

Making the signature look right

• Use a clean image. For uploads, photograph the signature on white paper in daylight, without shadows, and crop it tight. A signature with a grey paper background looks pasted on.
• Get the size right. Oversized signatures that cover printed text are the most common giveaway of a careless e-signature. Zoom in and check nothing underneath is hidden.
• Add the date if the form asks. Many forms have a date field next to the signature line. The PDF editor can add text and today's date anywhere on the page.
• Initial every page if required. Some contracts ask for initials on each page. Place a small typed or drawn set of initials on each one before the full signature on the last.

Is an electronic signature legally valid?

For most everyday documents, generally yes. Laws in many countries recognise electronic signatures: the E-SIGN Act and UETA in the United States, eIDAS in the European Union, and the Electronic Communications Act in the UK. What usually matters legally is your intent to sign and that the signature can be attributed to you, not the specific pixels on the page.

In India, the Information Technology Act, 2000 gives specific legal status to electronic signatures made with approved methods, such as a Digital Signature Certificate (DSC) or Aadhaar-based eSign. A pasted image of your signature is widely accepted for routine business documents, but it carries less weight as evidence than those methods if a dispute ever reaches court. The Act also excludes certain documents from electronic execution altogether, including wills, powers of attorney, trust deeds, contracts for the sale of immovable property, and negotiable instruments other than cheques.

The practical rule: for everyday agreements, a visual signature is normal and accepted. For high-value contracts, property, government filings and anything that might be disputed, ask the other party what they require, and use a certificate-based signature or a wet-ink signature if they ask for it. This article isn't legal advice; when the stakes are high, check the specific requirement.

Visual signature vs digital signature

The terms are often mixed up, but they are different things:

• A visual (electronic) signature, which is what the Sign PDF tool adds, is the electronic equivalent of ink: an image of your signature placed on the page. It shows intent; it doesn't by itself prove the document wasn't changed later.
• A certificate-based digital signature embeds cryptographic data tied to a verified identity. If anyone changes the document afterwards, the signature shows as broken. Regulated filings, tenders and some government portals require it, and they will tell you so explicitly.

When several people need to sign

Sign your part and send the signed PDF to the next person, who adds their signature to the copy they received, exactly like a paper contract going around for counter-signatures. Keep every version. If the document needs a formal record of who signed when, use a dedicated e-signature service that keeps an audit trail.

Protecting a signed document

A signed PDF is a document worth protecting: it contains your signature in a form someone could copy. Send it only to the people who need it, and consider adding a password with the Protect PDF tool if it will travel by email. Avoid posting signed documents publicly, even with details blurred.

Frequently asked questions

Can I sign on my phone?

Yes. Drawing with a finger on a phone screen works well, and you can photograph your paper signature with the same phone and upload it.

Can I fill in the rest of the form too?

Yes. Use the PDF editor, which fills existing form fields, adds text anywhere, and includes a signature tool, so you can do everything in one pass.

Why does the other party want a "wet" signature?

Some institutions, such as certain banks, registries and courts, still require ink on paper by policy or law. In that case print, sign, and scan or post it as they request.

Can someone copy my signature from a signed PDF?

Anyone with the file could screenshot it, just as with a scanned paper signature. That is a reason to share signed documents carefully, not a reason to avoid e-signing. The risk is the same as with a photocopy.