Obtain a digital certificate and create a digital signature
If you plan to exchange digitally-signed documents together with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, you can obtain a digital certificate from a reputable third-party certificate authority (CA).
Add or remove a digital signature for Microsoft 365 files
A digital signature is an electronic, encrypted, stamp of authentication on digital information such as e-mail messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.
Digital signatures and certificates - Microsoft Support
A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.
Insert a signature - Microsoft Support
Your handwritten signature gives your document a personal touch. You can scan your signature and store it as a picture to insert in the document. You can also insert a signature line to indicate where a signature should be written.
View digital signature and certificate details - Microsoft Support
View digital signature and certificate details. You can view information about a digital signature, or the certificate that is used to create the digital signature, in Word, PowerPoint, and Excel. For more information on adding or removing digital signatures, see Add or remove a digital signature.
Digitally sign your VBA macro project - Microsoft Support
This article describes how you can digitally sign a macro project on Windows by using a certificate. If you don't already have a digital certificate, you'll need to get one. Tip: To use or test macro projects on your own computer, you can create your own self-signing certificate by using the Selfcert.exe tool.
Remove hidden data and personal information by ...
If you want to remove hidden data and personal information from documents that you save in the OpenDocument Text (.odt) format, you must run the Document Inspector every time that you save the document in that format.
Digital signatures and certificates - Microsoft Support
A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.
Add a signature line - Microsoft Support
You can add a signature line to a document, add a graphic of your handwritten signature, or save a signature block as an AutoText building block. For information on adding a digital signature, see Add or remove a digital signature in Office files.
Enable editing in your document - Microsoft Support
If you receive or open a document and can't make any changes, it might be Open for viewing only in Protected View. Follow these steps to edit: Go to File > Info. Select Protect document. Select Enable Editing. Edit a protected document.
Scan and edit a document - Microsoft Support
Scan a document as a PDF file and edit it in Word. Tip: The conversion works best with documents that are mostly text. Scan your document according to the instructions for your scanner, and save it to your computer as a .pdf file. In Word, click File > Open.