Secure Your Workbooks

Ensure file security through the use of passwords, encrypt your entire workbook, or just individual worksheets.

Add Passwords

If you want to secure your Workbooks to ensure that the data within is only shared with those who are supposed to see it, you can add a password to the Workbook, protecting it from unauthorised access.

By making your Worksheets be read-only, you can protect your data as it ensures that only someone with the password - and therefore your permission - can access and modify your Worksheets and the data they contain.

Ready to Get Started?

Nuget Downloads 2,280,941|Version:2026.10just released

Free NuGet Download

Total downloads: 2,280,941

Install with NuGet

Version: 2026.10

PM > Install-Package IronXL.Excel

nuget.org/packages/IronXL.Excel/

In Solution Explorer, right-click References, Manage NuGet Packages
Select Browse and search "IronXL"
Select the package and install

C# PDF DLL

Download DLL

Version: 2026.10

Download and unzip IronXL to a location such as ~/Libs within your Solution directory
In Visual Studio Solution Explorer, right click References. Select Browse, "IronXL.dll"

Licenses from $999