Diffuse is a graphical text comparison and merge application built around side-by-side editing. Unlike tools limited to a pair of inputs, it can compare an arbitrary number of files at the same time, which makes it useful for reviewing several related revisions.
The application also allows manual correction of line matching. That is valuable when automatic alignment produces a poor correspondence between similar blocks, because the user can adjust the comparison before continuing with a merge.
Files remain directly editable within the comparison view, so review and correction can take place in the same interface.
This is free and open source software.
Key Features
- Compare and merge an arbitrary number of files side by side.
- Correct line matching manually when automatic alignment is not appropriate.
- Edit compared files directly from the application.
- Provide syntax highlighting for easier source-code inspection.
- Retrieve revisions from Bazaar, CVS, Darcs, Git, Mercurial, Monotone, RCS and Subversion repositories.
- Work with Unicode text.
- Provide unlimited undo while editing.
- Offer keyboard-oriented navigation for moving through comparisons efficiently.
- Support comparison and merge workflows without requiring a complete development environment.
Website: diffuse.sourceforge.net
Support:
Developer: Derrick Moser
License: GNU General Public License v2.0

Diffuse is written in Python. Learn Python with our recommended free books and free tutorials.
Related Software
| GUI Diff Tools | |
|---|---|
| Meld | Graphical diff viewer and merge application for the Gnome desktop |
| Kompare | KDE diff tool supporting a variety of diff formats |
| Diffuse | Tool for merging and comparing text files |
| TkDiff | Graphical front end to the diff program |
| objdiff | Local diffing tool for decompilation project |
| KDiff3 | Text difference analyzer for up to 3 input files |
| xxdiff | File and directories comparator and merge tool |
| RustDiff | Semantic JSON and XML diff tool |
| RCompare | File and directory comparison toolkit |
| Text Compare | Compare old and new text |
| Image Compare | Side-by-side image comparison tool for spotting differences |
| gap | Simple native graphical utility for comparing text files |
| meld-rs | Visual diff and merge tool for comparing files and directories |
Read our verdict in the software roundup.
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