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WinMerge
What it is
WinMerge is a free, open-source Windows tool for visually comparing and merging files and folders. File comparisons can show side-by-side panes, inline differences, syntax highlighting, a difference pane and moved-line detection. Folder comparisons can be recursive or single-level, apply regular-expression filters, recognize binary files and compare three versions. For images, it offers block highlights and overlay mode; CSV and TSV files can be displayed as tables. WinMerge creates Normal, Context and Unified patches and can resolve conflict files made by other tools. It also offers 64-bit Windows Explorer integration, 7-Zip archive browsing and plugins, and can be used as an external diff tool alongside version-control tools. The project is licensed under GPLv2, developed by volunteers and provides source archives with stable releases. Official WinMerge targets Windows, with no current plans for official cross-platform support in the main project line. Current 32-bit builds require Windows XP SP3 or newer; 64-bit builds require Windows 7 or newer. Release packages publish SHA-256 checksums, and the site recommends checking a downloaded package against its digest before running it. The software is provided without warranty, as permitted by law.
For and against
For
- Compares files and folders with three-way comparison.
- Creates Normal, Context and Unified patches.
- Displays CSV and TSV files as tables.
- Includes Windows Explorer integration and 7-Zip browsing.
- GPLv2 software with source archives.
Against
- Official project targets Windows only.
- 32-bit builds require Windows XP SP3 or newer.
- Software is provided without warranty.
The verdict
WinMerge offers a broad set of file, folder, image and table comparison tools at no cost. It is limited to Windows in the official project line, and users should note the stated operating-system requirements and no-warranty terms.
Who it suits
WinMerge suits developers comparing branches, administrators syncing configuration folders and power users comparing files, tables or images. It is for Windows users who need file or folder comparison and merge tools.
Plans and prices
WinMerge
Free open-source file and folder comparison and merge tool for Windows · GPLv2
Read 30 Sep 2026 · winmerge.io
On the record
- File comparison
- File comparison includes side-by-side panes, inline difference highlights, syntax highlighting, a difference pane, and moved-line detection.winmerge.io · read 30 Sep 2026
- Folder comparison
- Folder comparison supports recursive or single-level views, regex filters, binary awareness, and three-way comparison.winmerge.io · read 30 Sep 2026
- Image and table comparison
- Image comparison provides block highlights and overlay mode, while table comparison displays CSV and TSV files in table format.winmerge.io · read 30 Sep 2026
- Integrations
- WinMerge offers 64-bit Windows Explorer shell integration, 7-Zip archive browsing, plugins, and use as an external diff tool alongside version control tools.winmerge.io · read 30 Sep 2026
- Intended users
- The site describes workflows for developers comparing branches, administrators syncing configuration folders, and power users comparing files, tables, and images.winmerge.io · read 30 Sep 2026
- Other operating systems
- The FAQ says official WinMerge targets Windows and that there are currently no plans for official cross-platform support in the main project line.winmerge.io · read 30 Sep 2026
- Patches and conflicts
- WinMerge creates Normal, Context, and Unified patches and can resolve conflict files produced by other tools.winmerge.io · read 30 Sep 2026
- Purpose
- WinMerge is a free, open-source tool for visually comparing and merging files and folders on Windows.winmerge.io · read 30 Sep 2026
- Security and integrity
- Official release packages publish SHA-256 checksums, and the site recommends comparing a downloaded package's hash with its published digest before running it.winmerge.io · read 30 Sep 2026
- Source transparency
- WinMerge is licensed under GPLv2, developed by volunteers, and provides a full source archive with each stable release.winmerge.io · read 30 Sep 2026
- Support
- The site provides FAQ, step-by-step guides, and antivirus troubleshooting guidance.winmerge.io · read 30 Sep 2026
- Warranty
- The software is provided as-is under GPLv2 without warranty of any kind, to the extent permitted by applicable law.winmerge.io · read 30 Sep 2026
- Windows requirements
- Current 32-bit builds require Windows XP SP3 or newer, and 64-bit builds require Windows 7 or newer.winmerge.io · read 30 Sep 2026
