Smart & Connected Life Working From Home How to Secure Microsoft Office Files Protect your data with a password By Tony Bradley, CISSP-ISSAP Writer Tony Bradley is a former Lifewire writer and tech journalist who specializes in network and internet security. He is a respected information security expert and prolific author. our editorial process LinkedIn Tony Bradley, CISSP-ISSAP Updated December 05, 2019 Kathrin Ziegler / Getty Images Working From Home The Ultimate Guide to Shopping Online The Ultimate Guide to Online Learning at Home The Ultimate Guide to Skype Tweet Share Email Microsoft Office has built-in encryption options to safeguard your important documents, spreadsheets, and emails. Here's how to set up passwords for Word and Excel. How to Secure Microsoft Word Docs For Microsoft Word documents, you can choose a higher level of security when saving a file. These instructions apply to Word for Office 365, Word Online, Word 2019, Word 2016, Word 2013, Word 2010, Word for Office 365 for Mac, Word 2019 for Mac, Word 2016 for Mac, and Word for Mac 2011. Go to File and select Info. Select Protect Document. Select Encrypt with Password. Type a password, then type it again to confirm it. Select OK to save. Passwords are case-sensitive and can be a maximum of 15 characters long. Save your file so the password takes effect. How to Secure Excel Files The steps necessary to protect an Excel file are similar to those used for Word. These instructions apply to Excel for Office 365, Excel 2019, Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel for Office 365 for Mac, Excel 2019 for Mac, and Excel 2016 for Mac. Go to File and select Info. Select Protect Workbook. Choose Encrypt with Password. Enter a password and select OK. Reenter the password to confirm it, then select OK.