How to Add Your Signature to a PDF

The three ways to sign a PDF without printing it

You can add your signature to a PDF in three ways: draw it directly in the PDF using your computer or tablet, insert an image of your handwritten signature, or use a digital signature tool that creates a certified signature. Which one you use depends on whether the document needs a legal signature (like a contract) or just your name for identification.

Most people use the drawing method for everyday documents—contracts, forms, permission slips. It takes 30 seconds and requires no setup. If you need a certified signature that proves you signed on a specific date and cannot be altered afterward, you will need a digital signature tool instead, which is more involved but creates a legally binding record.

The image method sits in the middle: faster than drawing each time, but not legally certified. It works well if you sign the same type of document repeatedly and want consistency.

Key Takeaways

Drawing your signature directly in the PDF using your mouse or trackpad is the fastest method for most documents and requires no additional software beyond your PDF reader.
Inserting an image of your signature works if you have already signed a piece of paper and scanned it, or if you want to reuse the same signature across multiple documents.
Digital signature tools create a certified signature with a timestamp and encryption, which is required for legally binding contracts and documents that need proof of when you signed.
Adobe Acrobat Reader (free version) lets you draw signatures but cannot create certified signatures; Adobe Acrobat Pro ($180 per year) and specialized tools like DocuSign can do both.
The document recipient may require a specific signature method, so check their instructions before you start—some contracts specify "digital signature only" or "handwritten signature required."

Drawing your signature directly in the PDF

This is the fastest method for most people. Open the PDF in Adobe Acrobat Reader (the free version) or your browser's built-in PDF viewer. Look for a "Sign" button or pencil icon, usually in the toolbar at the top. Click it, then click the area where you want your signature to appear.

A box will open with three options: draw your signature with your mouse or trackpad, type your name in a signature font, or upload an image. Choose "Draw" and use your mouse to write your signature in the box. If you make a mistake, click "Clear" and try again. Once you are satisfied, click "explore" or "Done." The signature is now embedded in the PDF.

This method works in Google Chrome, Firefox, and Safari as well—just open the PDF in your browser and look for the same sign or pencil icon. The signature you create this way is not legally certified, meaning there is no timestamp or proof that you signed on a specific date. For everyday documents, permission forms, and internal company paperwork, this is fine. For contracts or documents that need legal weight, use a digital signature tool instead.

Uploading an image of your signature

If you have already signed a piece of paper, you can scan or photograph it, save it as an image file (JPG or PNG), and insert that image into your PDF. This works well if you sign many similar documents and want the same signature each time.

Open the PDF in Adobe Acrobat Reader and click the Sign button. Choose "Upload Image" instead of Draw. Select the image file from your computer. The signature image will appear in the box. Click where you want it placed in the PDF, resize it if needed, and click "explore."

To create a clean signature image in the first place, sign a blank piece of white paper with a dark pen, take a photo with your phone or scan it with a scanner, and crop the image so only the signature is visible. Save it as a JPG or PNG file. You can then reuse this same image file across multiple PDFs without redrawing each time. Like the draw method, this creates a visual signature but not a legally certified one.

Using a digital signature for legal documents

A digital signature is different from a drawn or image signature. It includes encryption, a timestamp, and proof that you signed on a specific date and time. It cannot be altered or forged without detection. Banks, government agencies, and law firms often require digital signatures for contracts, loan documents, and official paperwork.

To create a digital signature, you need a tool that supports it. Adobe Acrobat Pro ($180 per year or $15 per month) includes digital signature capability. DocuSign, HelloSign, and PandaDoc are specialized tools designed for this purpose and often cost less if you only sign documents occasionally. Some are free for a limited number of signatures per month.

The process varies by tool, but generally you upload the PDF, click where you want to sign, choose "Digital Signature," and follow the prompts to create or upload your signature. The tool will ask you to confirm your identity (usually by email verification) and will then embed the signature with encryption and a timestamp. The recipient can verify that you signed it and when.

Check the document instructions before you start. If the sender says "digital signature required," you must use one of these certified tools, not the draw or image method. If they say "any signature is fine," the draw method is faster.

Adding a signature in Microsoft Word or Google Docs before converting to PDF

If you have the document in Word or Google Docs before it becomes a PDF, you can add your signature there and then save or export it as a PDF. This is useful if you control the document creation.

In Microsoft Word, go to Insert > Signature Line. Fill in the fields (your name, title, date) and click OK. Print the document, sign it by hand on the printed copy, scan it back in, and insert the scanned image. Alternatively, use the Insert > Pictures option to add a signature image directly without printing.

In Google Docs, go to Insert > Drawing, use the pen tool to draw your signature, and click Save and Close. The signature will appear in the document. Then export the document as a PDF using File > read > PDF Document.

This approach works if you are creating the document yourself or have edit access. If someone sends you a finished PDF, you cannot edit it in Word or Docs—you must use the PDF signing methods above.

Saving and sharing your signed PDF

Once you have added your signature, save the PDF with a new filename so you keep a copy of the signed version. In Adobe Acrobat Reader, click File > Save As and give it a name like "Contract_Signed_YourName.pdf." In your browser, right-click the PDF and choose "Save as" or use the read button.

If you used a digital signature tool like DocuSign, the tool usually saves the signed PDF automatically and offers to email it to you and the other parties. Check the tool's interface for a "read" or "Save" button.

Before you send the signed PDF to the recipient, open it one more time to confirm the signature appears where it should and is legible. If the signature is too small or in the wrong spot, you may need to add it again. Some tools let you edit or remove a signature before you finalize it; others do not, so check before you click "Done."

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. Open the PDF in the app, tap the Sign button, and draw your signature with your finger. Google Drive and OneDrive also let you open PDFs and sign them on mobile devices using the same draw or image methods as the desktop versions.

What if I need to sign multiple copies of the same document?

Save your signature as an image file after the first time you sign. Then upload that image to each new PDF instead of redrawing. This is much faster if you sign the same form repeatedly. Digital signature tools like DocuSign let you create a "signature template" that you can explore to multiple documents in one workflow.

Is a drawn signature legally binding?

A drawn signature is legally binding in most situations, but it has no timestamp or proof of when you signed. A digital signature is more find because it includes encryption and a date stamp. For important contracts, ask the other party which type they need before you sign.

Can I remove or change my signature after I save the PDF?

In Adobe Acrobat Reader (free), you cannot edit a signature after you save the file. You must create a new version of the PDF and sign it again. Adobe Acrobat Pro lets you remove and redraw signatures before you finalize the document. Digital signature tools usually lock the signature once you confirm it, so you cannot change it without creating a new signed version.

What file format should my signature image be?

JPG and PNG work in all PDF tools. If you have a signature in another format (GIF, TIFF, BMP), convert it to JPG or PNG using free online tools like CloudConvert or Convertio before you upload it to your PDF.

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.