Step-by-step guide · 12 min read

How to Add an Electronic Signature to a PDF (Free, Without Uploading It)

To add an electronic signature to a PDF, you need two things: a signature saved as an image with a transparent background, and a tool that can place that image onto the page and save the result. You can do both free in your browser, and — this is the part most guides skip — you can do it without the document ever leaving your computer.

Open Signature Maker

Free
No signup
File never leaves your browser

That last point matters more than it sounds. After all, a signed contract usually contains your full name, your address, your rates and sometimes your ID number. However, most free “sign a PDF online” services work by uploading that file to a server you know nothing about.

Here’s how to do the whole thing properly.

First, create your electronic signature

You can’t sign a PDF until you have a signature to sign it with. There are three ways to create an electronic signature, and they suit different situations.

Type, draw or photograph

Type it. Enter your name and pick from 17 styles — flowing signature scripts, or printed handwriting that suits names and initials. It’s the fastest route and the most consistent: the same settings give you the same signature every time. It also doesn’t have to look typed. A handwriting realism control varies each letter slightly — a touch of tilt, a little drift off the baseline — the way real handwriting never repeats a letter exactly, and if you don’t like one variation you can shuffle for another. The live preview shows exactly what you’ll download. Good for invoices, proposals and internal paperwork.

Draw it. This gives you a genuinely handwritten signature: sign with a finger on a phone, a stylus on a tablet, or a mouse or trackpad on a laptop. Generally, a finger or stylus gives the best result. If a mouse-drawn line comes out shaky, a smoothing control will even it out without changing the shape of your signature. With a stylus the line responds to pressure — press harder for a thicker stroke, just like a pen — and if one stroke goes wrong you can undo it rather than starting over.

Photograph one you already signed. Sign on plain white paper with a dark pen, take a photo, and let the tool strip the background away. This gives you a digital version of your real handwritten signature — the only method that does. A slider lets you fine-tune how much of the paper it removes until only the ink remains, and you can recolour the ink to black or blue if your pen was a different shade.

Save it as a transparent PNG

Whichever you choose, the output you want is a transparent PNG. By contrast, a JPG will carry a white box around your signature that sits on top of the contract text like a sticker. You can make all three in the free Signature Maker.

How to add an electronic signature to a PDF

Once you have your signature, here’s how to sign PDF documents with it. The process to eSign a PDF with an electronic signature is short:

Open the PDF. Upload it to the signing tool. In a browser-based tool, your browser reads the file directly and sends nothing anywhere.
Place your signature. Add it to the page and drag it onto the signature line. As you drag, Signature Maker highlights the printed line underneath and seats your signature on it when you let go, so you don’t have to align it by eye.
Size it. In general, a signature on a contract usually sits somewhere around a quarter to a third of the page width. Too large reads as unserious; too small looks hesitant.
Add the date. Most signature blocks also have a date field right beside them. Add it as text rather than leaving it blank.
Fill any other blanks. Name, address, company number — anything the document asks for.
Download the signed copy. Keep the original unsigned file too. If a clause changes later you’ll want to start from a clean copy.

That’s it. The signed PDF opens anywhere — no special software needed at the other end. And if you accidentally refresh the page partway through, Signature Maker offers to restore everything you’d placed as soon as you reopen the same file.

Getting the placement right

Three small things separate a signed contract that looks professional from one that doesn’t.

Sit on the line, not through it. Your signature should rest on the printed rule the way a pen would, with the baseline touching it — not floating above it or crossing it.

Fine-tune with the keyboard. Once you select an item, the arrow keys nudge it a pixel at a time — hold Shift to move ten — and Ctrl+Z (Cmd+Z on a Mac) undoes the last change if something lands in the wrong place.

Match the ink to the document. Black reads as formal. Blue has a long tradition in contracts because it distinguishes an original signature from a photocopy. Either is fine; mixing them across the same document is not. Signature Maker offers black and blue ink, plus green and a custom colour picker.

How to eSign a document that needs initials on every page

Longer agreements often ask you to initial each page as well as sign the last one. The purpose is to show that nobody swapped a page between signing and filing.

However, doing this one page at a time on a fifteen-page agreement is miserable. What you want is to place your initials once, get the position right, and repeat them across every page automatically. In Signature Maker that’s two clicks: Add initials on one page, then Copy to every page. Signature Maker works out your initials from the name you type — Jane Smith becomes JS — and you can edit them, or download your initials as a separate PNG. Your initials should be a compressed version of your signature — the same hand, the same slant, just two or three letters — sitting small in a corner or on the margin rule.

Filling in blanks and replacing text

Contracts arrive with placeholders: [Full legal name], [date], an empty address line. So you need to put your details where those placeholders are.

There are two different jobs here, and confusing them is where people get into trouble.

Adding text is simply typing into an empty space. Straightforward, no complications.

Covering text versus removing it

Covering existing text means putting a white box over a placeholder so you can write over it. This is where you need to be careful, because most tools won’t tell you: drawing a white box over text does not remove that text from the file. It’s still sitting in the document’s content stream. In fact, anyone can select it, copy it, or run a text extractor and read it straight back.

For a placeholder like [Full legal name] that genuinely doesn’t matter — nobody cares that the words “full legal name” are recoverable. But if you’re covering a fee, a rate, an ID number or a clause you renegotiated, “hidden” and “removed” are very different things, and you should assume the other side can get to it.

Removing text for real is a separate operation. The only reliable method is to rebuild the affected page as an image, which destroys the underlying text objects rather than hiding them. The Signature Maker offers this as a tick-box — Permanently remove covered text — that appears once you’ve placed a cover box, and applies only to the pages that actually have one.

What the difference looks like

The difference is measurable. Here’s a real seven-page contract, with a cover box over the [Full legal name] placeholder on page one and a name typed over it:

	Cover box only	Cover box + permanent removal
Placeholder still extractable from the file	Yes	No
Selectable text on page one	78 items	1 item — your typed name
Page two	unchanged, 78 items	unchanged, 78 items
File size	about 140 KB	about 700 KB

With permanent removal, the only text left on that page is the name you typed in — nothing the cover box sat over survives.

That size jump is why it’s off by default rather than always on. You’re trading a searchable, selectable page for a genuinely redacted one, so it should be a deliberate choice — and only the pages carrying a cover box are rebuilt, so the rest of the contract stays fully searchable.

As a rule of thumb: covering is fine for placeholders and blanks, and permanent removal is what you want any time the hidden words would matter if the other side read them.

How to create a signature in Word and eSign a Word document

If you’re signing a Word file rather than a PDF, you can create a signature in Word from the same transparent PNG — no add-in needed. It’s also the simplest way to add an online signature to a Word document:

Click where the signature should go, then choose Insert → Pictures and pick your signature file.
With the picture selected, open Wrap Text and choose In Front of Text.
Then drag it onto the signature line and resize it from a corner.

Because the background is transparent, the printed line shows through underneath instead of disappearing under a white rectangle.

To eSign a Word document you’re sending to someone else, save it as a PDF first (File → Save As, then choose PDF). That locks the layout, so the recipient sees exactly what you saw and can’t accidentally move your signature.

How to add a signature in Google Docs

Google Docs works the same way, with the same transparent PNG:

Click where the signature should go, then choose Insert → Image → Upload from computer and pick your signature file.
Click the image and choose In front of text from the options bar that appears under it, so you can drag it freely.
Then drag it onto the signature line and resize it from a corner.

If you’d rather draw straight into the document, Insert → Drawing → New opens a small canvas you can sign on. A mouse-drawn signature there tends to look rough, though, which is why a prepared PNG usually looks better.

Some paid Google Workspace plans also include a built-in eSignature tool (Tools → eSignature) for sending documents out for signature. It isn’t available on free Google accounts or the Business Starter plan, so most freelancers use a saved PNG to eSign in Google Docs instead.

Signing in other languages

If you write your name in Urdu, Arabic, Hindi or Chinese, be aware that many PDF tools quietly fail here. The standard PDF fonts only cover Latin characters, so these tools often drop non-Latin text without any warning — you send the contract and the field is simply empty.

Signature Maker avoids this by rendering non-Latin text with your browser’s own typesetting engine — which knows how to join Arabic and Urdu letters and lay out right-to-left properly — and placing the result as an image. If you sign documents in a non-Latin script, test with your own name before you rely on a tool.

Is an electronic signature on a PDF legally valid?

In most jurisdictions, yes. Laws such as the US ESIGN Act and the EU’s eIDAS regulation recognise electronic signatures, and so does equivalent legislation across the UK, Australia, Canada and much of Asia.

There are real exceptions, though. Wills, certain property transfers, and some court filings still require wet ink in many places. Requirements also differ by document type and by country. For anything consequential, check the rules that apply to you — this is general information, not legal advice.

What makes a signature enforceable is generally the intent to be bound and evidence that you applied it, not the file format. A signature placed on a PDF you then email from your own address carries the same weight as most day-to-day paper signing.

Why “nothing is uploaded” is worth checking

Most free online signing tools work like this: you upload your contract, their server adds the signature, you download the result. Your document sits on someone else’s infrastructure, under a privacy policy you probably didn’t read.

Browser-based tools work differently. Your own browser opens your PDF, places the signature on your own device, and builds the finished file there too. The document itself is never sent anywhere.

You don’t have to take that on trust. You can watch it:

Open the tool, then open your browser’s developer tools and choose the Network tab. That’s F12 on Windows, or Cmd+Option+I on a Mac in Chrome, Edge or Firefox. In Safari, first turn on Show features for web developers under Settings → Advanced.
Upload your PDF, sign it, and download the result.
Look down the list. You’ll see the page downloading its own code and fonts — that’s the tool loading itself. What you won’t see is the page sending out your PDF, or anything the size of it.

One thing to be aware of: the parts of the tool that open and save PDFs are downloaded the first time you use them, not when the page first loads. So if your connection drops before you’ve opened or saved your first document, the tool will say it can’t load the PDF engine. That’s the tool failing to fetch its own code — not a sign your file was going anywhere.

Frequently asked questions

Getting started

Do I need to install anything to sign a PDF?
No. A browser-based tool needs nothing installed and no account. Open the page, add your signature, download the signed file.

Can I sign a PDF on my phone?
Yes, and drawing your signature with a finger on a touchscreen usually gives a better result than a mouse or trackpad. Make sure the tool handles touch properly — some cut the stroke short if your finger strays outside the signing area. Signature Maker keeps the stroke going even if you overshoot the edge, and ignores a second finger or a resting palm.

Signatures and security

What’s the difference between an electronic signature and a digital signature?
An electronic signature is any mark applied with intent to sign — typed, drawn, or an image placed on a document. A digital signature is a specific cryptographic method that also proves the file hasn’t been altered since signing. For everyday contracts and invoices, an electronic signature is what’s normally used and expected.

Will my signature look the same every time?
If you typed it, yes — identical every time. If you drew it, each one will vary slightly, which is normal and actually a sign of authenticity. Saving one signature and reusing it gives you consistency across documents.

If I cover text on a contract, is it really gone?
Not by default. A white box hides the words on screen but leaves them in the file, where anyone can still copy them out. To remove them properly you need the page rebuilt as an image — in the Signature Maker that’s the Permanently remove covered text option, which applies only to pages that have a cover box on them.

Saving and reusing

Can I reuse my signature on other documents?
Yes. Download it once as a transparent PNG and keep it somewhere sensible. Signature Maker also keeps up to five signatures saved on your device, ready for next time.

What file format should I save my signature in?
PNG with a transparent background for anything you’ll place on a document. If you typed your signature, you can also save it as SVG, which stays sharp at any size — useful for print. Drawn and photographed signatures are images, so they come as PNG or JPG only. Avoid JPG for documents — it can’t do transparency, so you get a white box.

Putting it together

Make the signature once — typed, drawn, or photographed from paper. Save it as a transparent PNG. Then open the contract, place the signature on the line, add the date, fill the blanks, and download.

You can do all of it in the free Signature Maker — create the signature three different ways, initial every page in one step, fill in blanks, and eSign PDF documents entirely in your browser. The tool uploads nothing, so the contract stays on your machine from start to finish.