The basic steps for signing a PDF

To sign a PDF, you open the file in software that supports digital signatures, click a "Sign" button or menu option, draw or insert your signature, and save the file. The exact steps depend on what software you use — Adobe Acrobat Reader, Preview on Mac, Microsoft Word, or a web-based tool like DocuSign or HelloSign all work differently.

Most people fall into one of three categories: signing a PDF you received from someone else (like a contract or form), signing a PDF you created yourself, or signing a PDF that needs to go to multiple people. Each path uses slightly different tools and takes a different amount of time.

Key Takeaways

  • Adobe Acrobat Reader's free version lets you sign PDFs by drawing, typing, or uploading an image of your signature, then saving the file.
  • Mac users can sign PDFs directly in Preview without installing extra software by clicking Tools, then Annotate, then Signature.
  • If the PDF needs to go to other people after you sign it, web tools like DocuSign or HelloSign handle routing and keep a record of who signed when.
  • A drawn signature, typed name, or image all count as a signature in most situations — the legal weight depends on the document type and your location, not the method you choose.

Signing in Adobe Acrobat Reader (free version)

Open the PDF in Adobe Acrobat Reader, then look for the "Sign" button in the toolbar on the right side of the screen. Click it, and you will see three options: Draw (to draw your signature with your mouse or trackpad), Type (to type your name in a signature font), or Image (to upload a photo of your handwritten signature).

Choose whichever method feels natural to you. If you draw, use your mouse or trackpad to write your name in the box that appears. If you type, select a font style and your name will appear in that style. If you upload an image, take a photo of your signature on paper, save it to your computer, and select the file.

Once you have created your signature, click where you want it to appear on the PDF. You can resize it by dragging the corners. When you are satisfied, save the file using File > Save or Ctrl+S (Windows) or Command+S (Mac). The signature is now part of the PDF.

Signing in Preview on Mac

If you use a Mac, Preview (the built-in image viewer) can sign PDFs without any extra software. Open the PDF in Preview, then click Tools in the menu bar at the top of the screen. Select Annotate, then Signature.

A window will appear asking you to create a signature. You can draw your signature using your trackpad, or click the camera icon to use your Mac's camera to photograph a handwritten signature on paper. Once you have created it, Preview saves it so you can reuse it on future PDFs.

After you have set up your signature, click where you want it to appear on the PDF. The signature will be placed at that spot. Save the file using File > Save or Command+S.

Signing in Microsoft Word

If the PDF is a form or contract, you can sometimes open it directly in Microsoft Word, sign it there, and save it as a PDF. Open Word, go to File > Open, and select the PDF file. Word will convert it to an editable document.

To add your signature, go to Insert > Signature Line. A dialog box will appear asking for your name and title. Fill in your information, then click OK. A signature line will appear in the document. Double-click it, and a signature box will open where you can draw your signature using your mouse or trackpad, or type your name.

After signing, save the file. If you want to keep it as a PDF, use File > Save As and choose PDF from the file type dropdown.

Using web-based signing tools for documents that need to route to others

If the PDF needs to be signed by multiple people, or if you need a record of when it was signed and by whom, web tools like DocuSign, HelloSign (now Dropbox Sign), Adobe Sign, or PandaDoc are better choices than signing it yourself first.

These tools work by uploading your PDF to their website, marking where each person needs to sign, entering their email addresses, and then sending them a link. Each person signs in their own browser, and the tool keeps a timestamped record of every signature. The final signed PDF is then sent to everyone involved.

Most of these services offer a free tier that lets you send a limited number of documents per month. DocuSign and HelloSign both allow one free signature per month on their free plans. If you sign documents regularly, a paid plan usually costs between $10 and $40 per month depending on the service.

The difference between drawn, typed, and image signatures

From a technical standpoint, it does not matter whether you draw your signature, type your name, or upload an image — all three are treated the same way by PDF software. The document will show your signature, and it will be saved as part of the file.

Whether a signature is legally valid depends on the type of document and the laws in your location, not on how you created it. Contracts, forms, and agreements signed digitally are generally recognized as legally binding in most U.S. states and many countries, as long as both parties agreed to sign electronically. A drawn signature, a typed name, or an image all satisfy that requirement.

For documents that require a notary or official witness, the rules are different — you will need to work with a notary service that can verify your identity, which usually means a video call or in-person meeting. That is a separate process from simply signing a PDF.

Saving and sharing your signed PDF

After you sign a PDF using any of the methods above, save the file immediately. Use File > Save or File > Save As to choose where it goes on your computer. If you are signing a document that someone else sent you, they usually want you to email it back or upload it to a shared folder.

If you used a web-based tool like DocuSign, the tool handles sending the signed document automatically — you do not need to email it yourself. If you signed it in Adobe Reader, Preview, or Word, you will need to send the signed file to whoever needs it.

Keep a copy of the signed PDF for your own records. If the document is important (a contract, agreement, or form), store it somewhere you can find it later, like a folder on your computer or a cloud service like Google Drive or OneDrive.

Frequently Asked Questions

Can I sign a PDF on my phone or tablet?

Yes. Adobe Acrobat Reader has a mobile app for iPhone, iPad, and Android that lets you sign PDFs the same way you do on a computer — by drawing, typing, or uploading an image. Most web-based signing tools like DocuSign also have mobile apps. Open the PDF in the app, tap the Sign button, and follow the same steps.

What if I need to sign a PDF that is password-protected?

You will need the password to open the file before you can sign it. If you do not have the password, contact whoever sent you the PDF and ask them to remove the protection or provide the password. Once the file is open, you can sign it normally.

Does signing a PDF in Adobe Reader make it legally binding?

For most documents, yes — a signature in Adobe Reader, Preview, Word, or any other PDF tool is treated the same way as a handwritten signature in most U.S. states and many countries. The document must show that both parties agreed to sign electronically. For documents that require a notary or official verification, you will need to work with a notary service instead.

Can I add a signature to a PDF without changing the original file?

Yes. When you sign a PDF in Adobe Reader or Preview, use File > Save As instead of File > Save. This creates a new file with your signature while leaving the original unsigned. Name the new file something like "contract-signed-yourname" so you know which version has your signature.

What is the difference between signing a PDF and adding a digital certificate?

A simple signature (drawn, typed, or image) shows that you signed the document but does not verify your identity. A digital certificate is a more secure method that uses encryption to prove who you are and that the document has not been changed since you signed it. Most everyday documents use simple signatures. Digital certificates are used for high-security documents like legal contracts or financial agreements.