Guides

How to sign a PDF without uploading it anywhere

Someone emails you a rental agreement, an employment contract or a school form and asks you to “just sign and send it back”. The quickest route most people find is a free signing website: drop the PDF in, draw a squiggle, download the result. It works, but it means a copy of the document, with your name, address, ID number and signature on it, now sits on a server you know nothing about.

You rarely need to do that. Every modern computer and phone can sign a PDF without the file leaving the device. This guide covers the options, the difference between the kinds of signature, and a short checklist for before you hit send.

Why uploading is worth avoiding

An online PDF tool has to receive your file to work on it. Reputable services delete files after a few hours, but you are taking their word for it, and the documents people sign are exactly the ones that are worth stealing: leases with addresses, contracts with salaries, forms with tax and passport numbers. A drawn signature saved on a stranger’s server is also a reusable image of your signature.

There are good reasons to use a full e-signature service such as DocuSign: when the other side requires it, or when you need an audit trail showing who signed what and when. For the everyday “sign this and email it back” case, signing locally is simpler and keeps the document yours.

Option 1: Adobe Acrobat Reader (Windows and Mac)

The free Acrobat Reader has a Fill & Sign tool. Open the PDF, choose Fill & Sign, then Sign yourself, and either type your name, draw a signature with the mouse or trackpad, or use a picture of your signature. Place it on the line and save.

One thing to watch: if you are signed in to an Adobe account, Reader may offer to save to Adobe’s cloud storage. Choose to save on your computer instead if you want the file to stay local.

Option 2: Preview on a Mac

Preview, the PDF viewer built into macOS, can sign without any extra software. Open the PDF, show the Markup toolbar, click the signature button and create a signature by writing on the trackpad or by holding a signature written on white paper up to the camera. Preview remembers it, so next time you just click and place it. Text boxes in the same toolbar let you fill in forms that don’t have fillable fields.

Option 3: Your phone

On an iPhone or iPad, open the PDF from Files or from a Mail attachment, tap the Markup button, then the plus button, and choose Add Signature. Draw it with your finger, place it and tap Done. The signed file is saved back where it came from.

On Android it depends on the phone. Some manufacturers’ file viewers have a signing tool, and Google Drive’s PDF viewer can fill in forms and add a signature to files stored in Drive. If the PDF is something you’d rather not keep in the cloud, use a signing app that works offline.

Option 4: A dedicated offline app

If you sign documents often, a desktop app made for the job saves time: a saved signature you can reuse, your initials on every page in one click, snippets for your address and ID number, and form fields that jump you to the next empty one. Our own app, pdfsign, is one of these. It’s free, runs on Windows or in your browser, and never uploads the file. Whichever tool you choose, check that it says plainly where your documents go.

Drawn, typed or a photo: which signature to use

For most everyday documents, any of these is fine. In the EU, the US and many other places, the law accepts a simple electronic signature, which includes a typed name or a drawn or scanned signature placed on a PDF, as long as it shows you meant to sign. What matters is that you can show it was you and that you agreed.

• A drawn signature looks most like your real one. Draw it slowly on a trackpad or a phone; a mouse makes shaky lines.
• A typed signature in a handwriting font is neat and perfectly valid for many documents, but some people on the other side expect something that looks hand-drawn.
• A photo of your real signature looks the most natural. Clean it up first so the paper background is transparent; a grey rectangle around the signature looks pasted on.

Some documents need more than a simple signature: property deeds, some financial and government forms, and anything that asks for a qualified or certified digital signature. If the document says so, follow its instructions; no drawing tool can stand in for those.

Filling in the rest of the form

Many PDFs have fillable fields: click into them and type. If yours doesn’t, add text boxes over the blank lines. A few tips that make the result look clean:

• Match the size of the text to the printed form; most tools let you change the font size.
• Write dates the way the form asks for them, and initial pages if the contract has an initials box on each one.
• Use “white out” or a filled white rectangle to cover an instruction or an old value, rather than writing over it.

Before you send it back

1. Scroll through every page. It’s easy to miss a second signature line or an initials box on page 4.
2. Lock or flatten the form if you can. Fillable fields stay editable unless you lock them, which means the next person could change your answers. Many tools have an option to lock or flatten fields; printing to PDF also flattens everything into the page.
3. Save the signed copy under a new name, such as “lease-signed.pdf”, so you keep the original too.
4. Open the saved file once more, in a different viewer if you have one, to make sure the signature and text came through.
5. Send it the way you were asked to, and keep a copy for your records.

The short version

You don’t need to upload a contract to sign it. Acrobat Reader, Preview, your phone’s markup tools or an offline app can all do it on the device in a couple of minutes. Pick the signature style the document calls for, check every page, lock the fields, and keep a copy.