How to Sign a PDF Electronically for Free (Step-by-Step)

Most contracts, forms and letters today just need a signature dropped onto a PDF - not a notarised digital certificate. For that, a free electronic signature is perfectly adequate in the vast majority of everyday cases, from signing a freelance agreement to countersigning a school permission slip. Here's how to do it properly, what actually counts as legally valid, and where free tools tend to cut corners.

Is a free electronic signature legally valid?

Yes, in most jurisdictions. Under eIDAS in the EU/UK and the ESIGN Act in the US, a "simple" electronic signature - typing your name, drawing it with a mouse or finger, or pasting an image of your handwritten signature - is legally binding for the vast majority of contracts, provided both parties intend to sign and the document can be tied to them (timestamp, email, IP address, or an audit trail).

The exceptions are documents that legally require a wet-ink signature or a notarised/qualified electronic signature: wills, some property deeds, certain court filings, and specific government forms. If you're unsure, a quick check with the receiving party or a solicitor is worth the five minutes.

What you need before you start

• The PDF you need to sign (if it's a Word doc or scan, convert it to PDF first)
• A way to produce your signature: mouse/trackpad, touchscreen, or a photo of your signature on paper
• If someone else needs to sign too, their email address

You don't need a scanner, a printer, or any paid software. Everything below can be done in a browser.

Step-by-step: signing a PDF online for free

1. Open the PDF in a signing tool. Upload it to a browser-based e-signature tool rather than trying to annotate it in a basic PDF reader, which usually only lets you add a stamp, not a proper signature field.
2. Choose how you'll create your signature. Most tools offer three options: type your name in a script font, draw it with your cursor or finger, or upload a scanned image of your actual signature.
3. Place it on the page. Drag the signature box to the correct spot - most tools let you resize it and add a date field or initials alongside it.
4. Add any other required fields. Text boxes for printed name, checkboxes, or a second signature block if you're also filling in for someone else.
5. Apply and download. The tool flattens your signature into the PDF so it can't be dragged around or edited afterwards, then gives you the finished file.
6. Send it on. Email the signed PDF back, or if the tool supports it, send a signing request link directly to the other party so they can sign their own copy without you having to forward files back and forth.

Konomic's Sign a PDF tool follows this exact flow - upload, draw or type your signature, place it, and download - and also supports sending a signing request to someone else by email if you need a second signer. No account is required for a single signature, which is worth knowing if you just need to get one document done quickly.

Typed, drawn, or uploaded: which signature type to use

• Typed is fastest and fine for internal or low-stakes documents, but looks the least personal.
• Drawn (mouse, trackpad, or finger on a phone) is the most common choice and satisfies most counterparties without question.
• Uploaded image of your real signature (photographed on white paper, background removed) looks the most authentic and is worth setting up once if you sign documents regularly - most tools let you save it for reuse.

None of these is inherently "more legal" than the others under simple electronic signature rules - what matters is that the signing act is clearly attributable to you.

Signing on a phone versus a desktop

Drawing a signature with a finger on a touchscreen is usually neater than a mouse, so if you're on a laptop without a trackpad that behaves well, it's often quicker to open the tool on your phone, sign there, and email the file to yourself. Most browser-based signing tools work fine on mobile without needing an app - check that the site is responsive before assuming you need to install something.

Sending a document to someone else for signature

If you're the one requesting a signature rather than providing one, look for a tool that supports a "signing request" flow: you upload the PDF, mark where the signature and date fields go, and the tool emails a link to the signer. They fill it in without needing an account, and you get notified when it's done. This avoids the common back-and-forth of printing, signing, scanning, and re-emailing that still happens more often than it should.

Free tools: what to watch for

Free tiers from providers like iLovePDF, Smallpdf and Sejda are genuinely usable for occasional signing, but read the fine print:

• Daily or monthly document limits that reset only after registering an account
• Watermarks or branding added to the free version of multi-page or multi-signer documents
• Signing requests to other people sometimes gated behind a paid plan
• Files stored on servers for days or indefinitely unless you delete them manually

None of these make a tool unsafe, but they're worth knowing before you commit a confidential contract to one.

Privacy considerations when signing PDFs online

A signed contract, tenancy agreement, or NDA often contains names, addresses, and sometimes financial details - not something you want sitting on a server indefinitely. When choosing a free signing tool, check where the servers are located, whether the provider is GDPR-compliant, and how long files are retained after processing.

Konomic runs entirely on EU-based (German) servers and automatically deletes every uploaded file within an hour of processing, whether you signed one page or ten. That's a reasonable default if you're signing anything with personal or commercial sensitivity and don't want to have to remember to go back and delete it yourself.

Common issues and quick fixes

• Signature looks pixelated when downloaded: draw it larger on screen before placing it; most tools scale down cleanly but scale up badly.
• The other party says the signature "didn't stick": make sure you clicked "apply" or "finish signing" rather than just closing the tab after placing the field.
• You need to sign a scanned image, not a real PDF: run it through an OCR or "convert to PDF" step first so the file behaves like a normal document with selectable pages.
• Multiple people need to sign in order: use a tool's signing request feature rather than emailing the same file to several people at once, which risks conflicting versions.

Signing a PDF for free is quick, legally sound for nearly all everyday documents, and doesn't require installing anything. Pick a tool with a signing flow that matches how you actually work - solo signature, or sending requests to others - and pay attention to where your document ends up afterwards.