Diffinity review
A capable free Windows diff tool with detailed comparisons, folder support, and two-way merging.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Diffinity is a freeware Windows desktop application for comparing and merging text files and folders. It is aimed at developers and other Windows users who need readable source-code differences, detailed text inspection, or a configurable diff tool for version-control applications. Comparisons can show line-, word-, and character-level changes, while syntax highlighting, tabs, thumbnail views, and manual alignment markers help organize larger files. The published support list covers Windows 7, 8, 10, and 11, with .NET 8.0 required.
Its strongest fit is detailed two-file comparison without a subscription or paid tier structure. Diffinity can compare folders, detect Unicode and file encoding automatically, and update inline differences while a file is being edited. Windows Explorer shell integration makes file access more direct, while command-line arguments support files and folders. Git and other version-control tools can also be configured to use Diffinity, giving it a practical place in Windows-based development workflows.
The main boundary is merge scope: Diffinity supports two-way comparison and merging, while three-way diff and merge are not supported. That makes it a focused choice for inspecting and reconciling two files or folder trees, rather than for workflows that depend on a separate base version and three simultaneous inputs. Choose Diffinity if you want a free Windows tool with granular comparison, folder support, encoding detection, and version-control configuration. Choose another product if three-way merging or a non-Windows desktop platform is required.
Diffinity pros and cons
- Where it wins
- Line-, word-, and character-level text comparison
- Folder comparison with syntax highlighting and thumbnail differences
- Git configuration, shell integration, and command-line support
- Where it doesn't
- Three-way diff and merge are unsupported
- Available only as a Windows desktop application
- Requires .NET 8.0
Diffinity fact sheet, pricing and score →
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