You have been sent a contract, an offer letter, a rental agreement, or a permission slip, and it needs your signature back today. You do not have a printer, and even if you did, the print-sign-scan-email loop takes twenty minutes and produces a grey, crooked scan that looks worse than the original.
You do not need any of that. Signing a PDF electronically takes about a minute, requires no software installation, and in most countries produces a signature with the same legal standing as ink on paper. Here is how to do it, what the different kinds of signature actually mean, and what tends to go wrong.
The three ways to create a signature
Every serious online signing tool gives you the same three options, and they suit different situations.
Draw it. You sign with your mouse, trackpad, or — much better — a finger or stylus on a touchscreen. This produces the most authentic-looking result and is the closest analogue to signing on paper. The honest catch is that mouse-drawn signatures look wobbly and unlike your real signature. If you are on a laptop and the document matters, open the same page on your phone and draw there instead; the difference is dramatic.
Type it. You type your name and the tool renders it in a script typeface. This is fast, legible, and perfectly acceptable for most routine business documents. It is what most people actually use. Nobody is fooled into thinking you drew it, and that is fine — the legal weight of an electronic signature comes from your intent and the record of the transaction, not from whether the marks look handwritten.
Upload an image. If you already have a scan or photo of your signature, you can place it directly. To get a clean one: sign a blank white sheet with a black pen, photograph it in good light, and crop tightly. A PNG with a transparent background sits best over document text, though a tightly cropped white-background image works on most pages.
Signing a PDF step by step
Using a browser-based editor such as Docento.app, the whole process is:
- Open the document. Drag the PDF onto the editor or click to browse for it. With an in-browser tool the file is read by your own machine and never uploaded anywhere — worth knowing when the document is an employment contract or a tax form.
- Create your signature using one of the three methods above. Most tools let you save it locally so you do not have to redraw it every time.
- Place it on the page. Click where the signature belongs. Drag to reposition, and use the corner handles to size it — a signature that overflows its line looks careless and can obscure the printed terms underneath it.
- Fill in everything else. Signature lines almost never travel alone. Add the date, print your name, initial the pages that ask for initials, and tick the boxes. A returned document missing its date field gets sent straight back to you.
- Export and check. Download the finished PDF, then actually open it. Confirm your signature is on the right page, in the right box, and that nothing shifted.
- Send it back with a short note naming the document and the date you signed.
Electronic signature or digital signature?
These sound interchangeable and are not. The distinction matters the day someone tells you your signature was "not accepted".
An electronic signature is the broad legal category: any mark or process you apply to a document indicating your intent to agree. A drawn or typed signature image is an electronic signature. This is what virtually every routine business document needs, and it is what browser-based editors produce.
A digital signature is a specific cryptographic mechanism. It binds the document to a certificate issued to you by a certificate authority, and any change to the file after signing invalidates it. Your PDF reader shows a tick and the signer's verified identity. This is what people mean by a "certificate-based" signature, and it requires a certificate you have to obtain — and often pay for.
Almost everyone asking how to sign a PDF needs the first kind. You need the second when a counterparty explicitly requires a certificate-based signature, when you are filing with a government body that mandates one, or in regulated contexts — certain EU qualified-signature requirements, some court filings, some records governed by regulations such as 21 CFR Part 11. Our guide on digital signatures versus electronic signatures goes deeper on where the line falls.
Is it legally binding?
For most everyday agreements, yes. The United States has recognised electronic signatures federally since the ESIGN Act of 2000, alongside state-level UETA adoption. The EU's eIDAS regulation recognises electronic signatures across member states and defines a tiered scheme — simple, advanced, and qualified — with increasing identity assurance. The UK, Canada, Australia, India, and most other major jurisdictions have equivalent provisions.
What the law generally cares about is that you intended to sign, that you consented to doing business electronically, and that the signed record can be retained and reproduced. What it generally does not care about is whether your signature is a drawing or a rendered typeface.
There are exceptions worth knowing. Wills and testamentary trusts, certain family-law documents, some property transfers, and documents requiring notarisation frequently demand wet ink or a specific notarial process. Requirements vary by jurisdiction, so treat this as orientation rather than legal advice: if your document falls into one of those categories, ask the party requesting it what form they need.
Things that go wrong, and how to avoid them
The signature is enormous, or microscopic. Placement tools default to a size that rarely matches the line. Resize before exporting and check it against the printed line width.
The file will not open in the editor. Password-protected and encrypted PDFs often refuse to load, or refuse to export correctly. If you know the password, the practical workaround is to open the file in your PDF reader, print it to a new PDF using your system's "Save as PDF" print option, and sign the unprotected copy.
The signature vanished, or moved. This usually means the annotation was not flattened into the page content. Some tools keep signatures as separate annotation objects that other readers render differently — or not at all. Exporting a flattened copy makes the signature part of the page itself, which is what you want for anything you send onward. See how to flatten a PDF for the detail.
You signed the wrong version. Contracts get revised. Before signing, confirm the filename or version matches the one you agreed to, and skim the terms rather than trusting that nothing changed since the last draft.
You sent it to the wrong person. A signed document contains an image of your signature, which is worth treating as sensitive. Check the recipient before attaching.
After you sign
Keep your own copy. Save the signed PDF somewhere durable rather than leaving it in your Downloads folder or relying on the other party's records. Name it usefully — 2026-07-27-supplier-agreement-signed.pdf beats document(3).pdf when you need it in eighteen months.
If the signed file is too large to email, compressing it usually solves the problem without touching legibility. And if the document also needs text filled in or boxes ticked, our guides on filling out PDF forms and editing PDF text cover the rest of the job.
