Compare C# code online

About this C# comparison

Whether you are comparing two versions of a class, checking an auto-generated file after a tool upgrade, or reviewing a change without opening Visual Studio, a C# diff shows exactly which members and statements changed.

C# syntax colours keep keywords, strings and types easy to read, with the changes marked on top.

What changed in this sample

• num1, num2 and sum became a, b and result, set to 12 and 18.
• The Console.WriteLine label changed from “Sum” to “Result”.
• The if threshold went from 15 to 20, and both messages changed with it.

Tips for comparing C#

Compare generated code

Designer files and generated clients change in bulk. Fold unchanged keeps the result short, and the arrows jump between changes.

Ignore CRLF

Files from Windows use CRLF line endings. Those are never counted as changes, and a note tells you when the two files differ.

Compare project files too

.csproj and app.config files are XML; opening them switches the highlighting to XML.

Undo a replacement

Opening a file over existing text shows an Undo button, so you never lose what was in the pane.

How to compare C# online

1. Paste the older version into Original and the newer one into Changed, or open a file on each side.
2. Check that the syntax menu says C#, then pick split or unified view.
3. Step through the changes with the arrows or Alt ↓, and use Settings for options such as ignoring blank lines.
4. Save the comparison in your browser, share a link, or download it as a .diff, HTML or PDF.

C# comparison: questions