How to digitally sign a Word document

But how can these documents be protected from unauthorized tampering? Can you electronically sign a Word document?

Fortunately, the answer is yes. However, when you sign Word documents, or any document for that matter, it’s essential to follow the correct steps. Below, we discuss how a digital signature works and the process to e-sign a Microsoft Word document.

How do digital signatures in Microsoft Word work?

An electronic signature is a broad term for signing a document electronically, such as typing your name, drawing a signature, or inserting an image of your handwritten signature. A digital signature is a type of electronic signature that uses a digital certificate to verify the signer’s identity and help prove that the document has not changed after signing.

Digital signatures enable secure electronic document exchange and workflows, ensure document integrity and authorship, and satisfy electronic document compliance requirements. They do this by using encryption and a signing certificate to connect a document to a verified signer. Digital signature certificates are issued by a certificate authority (CA), such as Sectigo.

When a Word document is digitally signed, recipients can confirm who signed it and whether the file has been tampered with since the signature was applied.

Digital signatures can also be applied to a variety of other document types including Adobe PDF files, and image files.

Adding a signature line in Microsoft Word

Signature lines in Microsoft Office are best used when you want a visible signing area in the document. They work well for contracts, approvals, internal forms, and documents that need a clear signer field.

Signed documents have a Signatures button at the bottom. In addition, for signed documents, signature information appears in the Info section and can be viewed by clicking the File tab in Word.

To add a signature line, follow these steps:

1. Open the document you want to sign in Microsoft Word or Excel.
2. In the Word document or Excel worksheet, place your cursor where you want the signature line to appear.
3. Click the Insert tab located at the top right of the menu bar. A new dropdown will appear.
4. Click Signature Line, located in the “Text” section on the right side of the new dropdown.
5. In a Signature Setup dialog box, enter the suggested signer’s name. You can also add the signer’s title, email address, and signing instructions.
6. Select Allow the signer to add comments in the Sign dialog box if you want the signer to include a signing purpose.
7. Select Show sign date in signature line if you want the signature date to appear.
8. Click OK

Once completed, a signature line will appear on the document in the location you chose. These steps can be repeated if additional signatures are required. Some features may vary based on the Word version.

If you frequently use the same signature block, you can save it as AutoText or include it in a document template. This helps standardize signature details and speeds up the signing process across multiple Word files.

How do you sign a Word document with a signature line

If you are the signee, a document will be provided to you with a signature line already populated within the Word doc. By placing your signature on the line, you create both a visible and a digital version of your signature. To insert a signature in a Word document, follow these steps:

1. Double-click the signature box or right-click and choose Sign.
2. A dialog box will appear with several options to add your signature. These options include:
   1. A printed version of your signature by typing your name in the box next to the X.
   2. A handwritten signature by using the inking feature.
   3. An image of your signature by clicking Select Image. Once selected, a popup window will appear allowing you to choose where your image file is located.
3. Once your signature is added, click Sign.

Once added, a small signature icon will also appear at the bottom of the window to signify that the document was signed. Recipients can double-click the signature or click the icon to see information about the signer.

How to add an invisible digital signature in Microsoft Word

Before digitally signing a document with a digital signature certificate, you need to purchase and complete validation for a certificate from a trusted Certificate Authority, such as Sectigo. Once issued, the certificate will be available on your device through the supported signing method such as a USB token.

Then follow these steps:

1. Within the File tab, select Info
2. Select Protect Document > Add a Digital Signature
3. A dialog box will appear with several fields you may choose to populate. These options include:
   1. Commitment Type: Select the type of commitment you are making by signing (e.g. created and approved this document)
   2. Purpose for signing this document: Enter the reason for signing the document.
4. Click Sign. You will then be prompted to save the file to your device. Once saved, the invisible digital signature is finalized.

Once added, a small signature icon appears at the bottom of the window to signify that it was signed. Recipients can click the icon to view information about the signer.

How to add a digital signature in Microsoft Windows using a digital signature certificate

Before digitally signing a document with a digital signature certificate, you need to purchase and complete validation for a certificate from a trusted Certificate Authority, such as Sectigo. Once issued, the certificate will be available on your device through the supported signing method such as a USB token.

Then follow these steps:

1. Open the document that needs to be signed.
2. Plug the USB smart card token with the certificate into the USB port of your computer. Microsoft will automatically copy the certificate to your computer’s cryptographic API (CAPI) certificate store.
3. Click More Tools on the Tools pane. The Create & Edit page will appear.
4. Select Certificates.
5. On the Certificates toolbar, select Digitally Sign. The Signature Area Selection dialog box will appear.
6. Click OK in the Signature Area Selection dialog box.
7. Using your mouse, click and drag to draw the area where you would like the signature to appear. The Sign with a Digital ID dialog box will appear.
8. Click Continue. The Sign as <Your name> dialog box will appear.
9. Click Sign. The Windows Explorer dialog box will open.
10. Select the folder where to save the signed document.
11. Type the document name.
12. Click Save. You will be prompted to enter your PIN.
13. Enter your PIN and click OK. Your signature will appear in the document.

Secure Word documents with Sectigo's signing certificates

For simple documents, a typed signature, scanned signature image, or Word signature line may be enough. For higher-trust documents, a certificate-backed digital signature provides stronger protection.

Sectigo Document Signing Certificates help individuals and organizations apply trusted digital signatures to important files, supporting document integrity, compliance needs, and non-repudiation. Document Signing Professional is built for independent professionals who sign under their own name, while Document Signing Enterprise supports organizations that need managed document signing across multiple users.

Contact Sectigo today to learn which solution is right for your needs.