Where to find the signature tool in Adobe Acrobat

Open your PDF in Adobe Acrobat (the full desktop version, not the free Reader). Go to the Tools menu at the top, then select Fill & Sign. You'll see a toolbar appear on the right side of your screen with signature and initial options. If you don't see Tools in your menu bar, click the three horizontal lines (hamburger menu) in the top left corner.

The Fill & Sign tool works on any PDF — you don't need the document to be a form. This is the same place you'd go to sign a contract, a mortgage document, or a straightforward letter someone sent you as a PDF.

Key Takeaways

  • Adobe Acrobat's Fill & Sign tool is in the Tools menu, and it lets you add your signature to any PDF without printing it.
  • You can draw your signature with your mouse or trackpad, upload an image of your handwritten signature, or type your name in a signature font.
  • Your signature is saved to your Adobe account and can be reused on future documents, but each document you sign gets its own copy.
  • Signing a PDF in Acrobat creates a visual signature that shows you signed it, but it is not the same as a legally binding digital signature with encryption.
  • You can place your signature anywhere on the page and resize it before you commit it to the document.

Creating a signature for the first time

When you click the signature icon in the Fill & Sign toolbar, Acrobat will ask you to create a signature if you haven't made one before. You have three options: Draw, Image, or Type.

Draw lets you sign with your mouse or trackpad by clicking and dragging on the signature box. This mimics signing on paper, though it usually looks less natural than your actual handwriting. If you're using a laptop trackpad, draw slowly and deliberately — fast movements tend to come out shaky.

Image lets you upload a photo or scan of your actual handwritten signature. Take a photo of your signature on white paper with good lighting, or scan it if you have a scanner. Save it as a JPG or PNG file, then upload it through this option. This method looks most like your real signature.

Type lets you enter your name and choose from several signature fonts. Acrobat will display your typed name in a cursive or formal style. This is the fastest option and works well for business documents, though it's clearly not handwritten.

Placing your signature on the document

After you create your signature, click anywhere on the PDF where you want it to appear. A box will show up with your signature inside it. You can drag the corners to resize it — make it as large or small as you need. The signature will be placed exactly where you click, so if you need it in a specific spot (like a signature line), click directly on that line.

If you place it in the wrong spot, click elsewhere on the page to place a new copy, then delete the first one. You can add your signature multiple times to the same document if you need to sign in more than one place.

Once you're happy with the placement and size, click outside the signature box to lock it in place. The signature is now part of the PDF.

Saving and storing your signed document

After you sign, save the PDF by pressing Ctrl+S (Windows) or Command+S (Mac), or go to File > Save. Acrobat will save the signed version to your computer. The original file is replaced unless you choose Save As to keep both versions.

Your signature itself is stored in your Adobe account. The next time you open Fill & Sign, your signature will be available in the toolbar without having to recreate it. This makes signing multiple documents faster — you just click the signature icon and place it on the new PDF.

If you want to send the signed PDF to someone else, use File > Share or straightforward email the saved file as an attachment. The person receiving it will see your signature on the document, but they won't be able to remove or alter it without specialized tools.

The difference between a visual signature and a digital signature

What you've just created is a visual signature — it shows that you signed the document, but it doesn't use encryption or verification. Anyone with Acrobat can open the file and theoretically add or remove signatures, though doing so would be obvious to anyone looking at the document history.

A true digital signature uses a certificate and encryption to prove that you signed the document and that it hasn't been altered since you signed it. Digital signatures are legally binding in most jurisdictions and are what you'd use for contracts, mortgage documents, or anything that needs to hold up in court. Creating a digital signature in Acrobat requires a certificate from a trusted provider like DocuSign, GlobalSign, or your company's IT department.

For most everyday documents — permission slips, informal agreements, PDFs you're returning to a friend — a visual signature is enough. For legal or financial documents, check with the other party about whether they need a digital signature instead.

Troubleshooting common signature problems

If the Fill & Sign tool doesn't appear in your Tools menu, you may be using Adobe Acrobat Reader (the free version) instead of the full Acrobat process. Reader lets you view and comment on PDFs but not sign them. You'll need to upgrade to Adobe Acrobat Standard or Pro, or use a free alternative like Smallpdf or ILovePDF if you only need to sign occasionally.

If your drawn signature looks messy or shaky, try the Image option instead — upload a photo of your real signature. If you're using Type, experiment with different fonts in the dropdown menu until you find one that looks professional to you.

If you accidentally placed your signature in the wrong spot, undo the action by pressing Ctrl+Z (Windows) or Command+Z (Mac) when ready. If you've already saved the file, open it again and use the eraser tool in the Fill & Sign toolbar to remove the signature, then place it correctly and save again.

Signing PDFs on mobile devices

Adobe Acrobat Reader (the free app) on iPhone, iPad, and Android lets you add a signature to a PDF. Open the document in the app, tap the pencil icon at the bottom, then tap Sign. You can draw your signature with your finger, add an image, or type your name. The process is similar to the desktop version, though the smaller screen makes drawing signatures trickier.

If you're signing on a tablet with a stylus, you'll get much better results than signing with your finger on a phone. Save the signed PDF to your device or email it directly from the app.

Frequently Asked Questions

Can someone else forge my signature if I save it to my Adobe account?

Your signature is stored in your account, so only you can access it with your login. However, once you place your signature on a PDF and save it, anyone with that PDF file can see it. A visual signature doesn't prevent someone from copying the image and pasting it onto another document. If you need to prevent forgery, use a digital signature with a certificate instead.

Do I need to be connected to the internet to sign a PDF?

No. You can sign offline in Adobe Acrobat. Your signature is stored locally on your computer and synced to your Adobe account when you're online again. If you're using Adobe Acrobat Reader on mobile, you'll need an internet connection to save and sync your signature.

Can I change my signature after I've created it?

Yes. Go to Tools > Fill & Sign, then look for your signature in the toolbar. Right-click it (or long-press on mobile) and select the option to delete it. Create a new signature using the same method. Your old signature will remain on any PDFs you've already signed, but future documents will use the new one.

What if the person I'm sending the PDF to says they can't see my signature?

Make sure you saved the file after signing it. If you only signed it but didn't save, the signature won't be in the version they receive. Open the file, verify your signature is visible, then save it again before sending. If they still can't see it, try exporting the PDF as a new file: go to File > Export To > PDF, which sometimes fixes display issues.

Is a signature I add in Acrobat legally valid?

A visual signature in Acrobat shows that you signed the document, but it's not legally binding in the way a digital signature with a certificate is. For contracts, mortgages, and other documents that need legal weight, ask whether the other party requires a digital signature. For informal agreements or documents between people who trust each other, a visual signature is usually sufficient.