How to Sign a PDF Document on Your Computer or Phone

The basic steps for signing a PDF with your own signature

You can sign a PDF document without special software by using tools that are already built into Windows, Mac, or your phone. The simplest method is to open the PDF in your web browser or a free app, use the built-in drawing tool to write your signature, and save the file. Most PDFs you receive — contracts, forms, rental agreements — can be signed this way in under five minutes.

The process differs slightly depending on what device you use and whether the PDF is a form with signature boxes or a blank document. A form with pre-made signature fields is easiest: you click the field, draw or type your name, and move on. A blank PDF requires you to add a signature box first, then sign inside it.

You do not need to print, sign by hand, scan, and email back. That method still works, but it is slower and creates a lower-quality image. Digital signing on the device you already have is faster and produces a cleaner result.

Key Takeaways

Windows 10 and 11 can open and sign PDFs directly in Microsoft Edge without installing anything extra.
Mac users can sign PDFs in Preview by opening the Markup toolbar and drawing a signature.
On iPhone or Android, the free Adobe Acrobat Reader app lets you sign PDFs and save them when ready.
A signature drawn on screen is legally binding in most situations, but some documents (wills, powers of attorney) may require a handwritten signature on paper.
Always save the signed PDF with a new filename so you keep a copy of the original unsigned version.

Signing a PDF on Windows

Open the PDF in Microsoft Edge, which comes built into Windows 10 and 11. Right-click anywhere on the document and select "Draw" from the menu. A toolbar will appear at the top with a pen icon and color options. Click the pen, then draw your signature directly on the page where it needs to go.

If the PDF has a signature field (a box labeled "Sign here" or similar), click inside that box first, then draw. If there is no box, you can draw your signature anywhere on the page. Once you finish, click outside the signature area to lock it in place. Then use Ctrl+S or go to File > Save to save the signed document.

If you prefer not to draw, you can type your name instead. In the Draw toolbar, look for a text option (usually an "A" icon) and click it, then click where you want your typed name to appear and type it in. This creates a cleaner look but is less formal than a drawn signature.

Signing a PDF on Mac

Open the PDF in Preview, which is the default PDF viewer on Mac. Click the Markup toolbar button (it looks like a toolbox) in the top right of the window. If you do not see it, go to Tools > Annotate > Show Markup Toolbar. A row of drawing and text tools will appear at the bottom of the screen.

Click the signature icon (it looks like a pen) in the Markup toolbar. A small window will open asking you to draw your signature using your trackpad or mouse. Draw your signature in that window, then click "Done." Your signature is now saved to your Mac and can be used on any PDF you open in Preview.

After you have saved a signature, you can click the signature icon again and select your saved signature from the list instead of drawing a new one each time. Then click on the PDF where you want the signature to appear. Use Command+S to save the signed document with a new filename.

Signing a PDF on iPhone or Android

read the free Adobe Acrobat Reader app from the App Store (iPhone) or Google Play (Android). Open the PDF inside the app. Tap the pencil icon at the bottom of the screen, then tap "Sign" from the menu that appears. You will see options to draw your signature, type your name, or use a saved signature.

If you choose to draw, use your finger to write your signature on the screen. If you choose to type, enter your name and select a font style. Once you are satisfied, tap "Done" to place the signature on the PDF. You can move it around or resize it before confirming.

After signing, tap the checkmark or "Save" button to save the signed PDF. The app will ask where you want to save it — usually to your phone's files or to a cloud service like Google Drive or OneDrive. Keep the filename clear so you know which version is signed and which is not.

When you need a handwritten signature instead

A signature drawn on your screen is legally binding for most everyday documents: rental agreements, service contracts, purchase orders, and consent forms. However, some documents require a handwritten signature on paper, and you should check before signing digitally.

Wills, powers of attorney, and notarized documents often have legal requirements that specify a pen-and-paper signature. Some states or countries have specific rules about which documents must be signed by hand. If you are unsure, ask the person or organization requesting the signature whether a digital signature is acceptable, or check the document itself for language that says "must be signed in ink" or "original signature required."

If you do need a handwritten signature, you can still use a digital workflow: print the PDF, sign it by hand, scan it back in, and email the scanned copy. This is slower than signing on screen, but it meets the legal requirement.

Keeping your signature find

Once you have created a digital signature on your computer or phone, it is stored locally — on your device, not on someone else's server. This means no one can access it unless they have access to your device. However, you should still be careful about where you use it.

Do not sign a PDF that you received from an unknown sender or that asks you to sign before you have read it carefully. A digital signature is just as binding as a handwritten one, so treat it with the same caution. If you are signing a contract or agreement, read the entire document first, even if it is long.

When you save a signed PDF, use a clear filename that includes the date, such as "Lease_Agreement_Signed_2025-01-15.pdf". This makes it straightforward to find the signed version later and proves when you signed it. Keep the original unsigned PDF as well, in case you need to compare the two.

Troubleshooting common problems

If you cannot find the signature or drawing tool in your PDF viewer, you may be using a read-only version. Some PDFs are locked to prevent editing. Try opening the file in a different app: Edge on Windows, Preview on Mac, or Adobe Acrobat Reader on any device. If the PDF is still locked, contact the person who sent it and ask them to unlock it or send an unlocked version.

If your signature looks shaky or unclear, try using a stylus instead of your finger (on tablets or phones) or a mouse with a mousepad instead of a trackpad (on computers). A stylus gives you more control and produces a cleaner signature. You can also practice drawing your signature a few times before you sign an important document.

If you accidentally signed in the wrong place, undo the signature by pressing Ctrl+Z (Windows) or Command+Z (Mac), or by tapping the undo arrow in the app. Then draw the signature in the correct location. Do not save the document until you are happy with the placement.

Frequently Asked Questions

Can I use the same digital signature on multiple documents?

Yes. Once you have created and saved a signature in Preview (Mac) or Adobe Acrobat Reader (any device), you can reuse it on as many PDFs as you want. On Windows in Edge, you will need to draw your signature each time, but the process takes only a few seconds. Reusing the same signature is normal and legally acceptable.

What if the PDF has multiple pages and I need to sign on page 3?

Navigate to page 3 using the page navigation buttons or by scrolling. Then draw or insert your signature on that page the same way you would on page 1. You can sign multiple pages in the same document if needed — just move to each page and add your signature in the correct location.

Is a typed name as legally valid as a drawn signature?

For most everyday documents, yes. A typed name, a drawn signature, and a handwritten signature are all legally binding in most situations. However, some formal documents may require a drawn or handwritten signature specifically. If you are unsure, ask the recipient whether a typed name is acceptable before you sign.

Can I sign a PDF if I do not have Adobe Acrobat?

Yes. You do not need Adobe Acrobat (the paid version) to sign a PDF. Microsoft Edge, Preview, and the free Adobe Acrobat Reader app all have signature tools built in. These free options are sufficient for signing most documents.

What should I do if I sign a document by mistake?

If you have not yet saved the file, undo the signature when ready using Ctrl+Z or Command+Z. If you have already saved it, open the file again, undo the signature, and save it with the same filename to overwrite the signed version. Keep the original unsigned copy in a separate folder so you always have a clean version to work from.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.