WinMerge: See Exactly Where Two Files Differ

Solves in a sentence: Not sure what you changed after editing code? Use WinMerge to compare — every addition, deletion, and change is clearly highlighted.

One of the most frequent tasks in a programmer’s daily life: comparing file differences. What changed in the code, how a config file differs from the original, whether the contents of two folders are identical — these are all high-frequency needs.

Beyond Compare is powerful but costs money. Using the command-line diff isn’t intuitive enough. WinMerge fills this need perfectly and is free.

What is WinMerge?

WinMerge is an open-source file and folder diff tool. It displays the contents of two files side by side in two columns. Different lines are highlighted in color, and you can merge differences to either side with one click.

The problem it solves: Intuitively showing differences between files and folders, making it easy to review and merge changes.

Core Features

• File comparison: Compare two files line by line — additions, deletions, and changes are一目了然
• Folder comparison: Compare two directories, showing which files are added, deleted, or modified
• Merge editing: Edit directly in the comparison view, merge to left or right with one click
• Syntax highlighting: Supports C++, Python, JavaScript, and many other languages
• Plugin support: Supports comparing images, Office documents, etc. (requires additional plugins)
• Patch generation: Directly generate unified format diff patch files

Comparison

Comparison	WinMerge	Beyond Compare	VS Code Built-in
Price	Free	$60+	Free
Folder Comparison	✅ Complete	✅ Complete	❌
Three-way Merge	✅	✅	❌
Syntax Highlighting	✅	✅	✅
Startup Speed	Fast	Fast	Fast
Cross-platform	❌ Windows	✅	✅

WinMerge is the best free alternative to Beyond Compare on Windows.

Who Is It For?

• Developers: Compare code changes, merge branches
• DevOps: Compare configuration file differences
• Writers: Compare two versions of a document
• Regular users: Check if two folders are exactly identical

Download

• Official website: https://winmerge.org/
• GitHub Releases: https://github.com/WinMerge/winmerge/releases
  • Download the “WinMerge-*-Setup.exe” installer

Tip: During installation, it’s recommended to select “Integrate with right-click menu” so you can right-click a file to directly invoke WinMerge for comparison.

Quick Start

1. Download and install WinMerge
2. Open it, click “File” → “Open”
3. Select the two files (or folders) to compare
4. Differences are color-coded: red = modified, green = added
5. Click the arrow between diff lines to merge
6. Save directly after editing