WinMerge's default settings work great out of the box, but customizing them can significantly improve your workflow. This guide covers all the key settings and what they do.
Opening Settings
Go to Edit → Options (or press Ctrl+,) to open the WinMerge preferences dialog.
General Settings
- Automatically close comparison with identical items — saves time when files are the same
- Recent project history — control how many recent comparisons to remember
- Multiple document interface — open multiple comparisons in tabs
Colors & Appearance
Under Colors, you can customize the highlight colors for added, removed, and changed lines. Good color choices make it faster to scan differences at a glance.
💡 Tip: If you prefer a light theme, change the background colors here. WinMerge doesn't have a built-in dark/light mode toggle — you configure it manually via color settings.
Syntax Highlighting
Under Editor → Syntax highlighting, choose from dozens of supported languages including Python, JavaScript, C++, HTML, SQL, and more. WinMerge auto-detects based on file extension.
Whitespace Handling
Under Compare → Whitespace, configure how WinMerge treats spaces and tabs:
- Compare all whitespace — default; every space difference is flagged
- Ignore whitespace change — ignores changes in the amount of whitespace
- Ignore all whitespace — whitespace differences are completely ignored
Shell Integration
Under Shell Integration, you can re-enable or disable the right-click context menu option in Windows Explorer. Useful if you want to quickly compare files without opening WinMerge first.