WinMerge compares files and folders side by side, highlighting every difference and letting you copy changes between the two versions. It suits developers reviewing code changes, writers checking revised drafts, and anyone verifying that a folder copy matches its original.
WinMerge is a comparison and merge tool for files and folders. Point it at two documents and it displays them side by side with differences highlighted line by line; point it at two directories and it produces a tree showing which files match, which differ, and which exist on only one side. From there you copy individual changes in either direction, edit directly in the comparison panes, or save the result. Navigation keys move between differences so a long file can be reviewed in order, and the same session can generate a patch file or an HTML report. Typical jobs include reviewing edits before publishing, checking that a backup matches the source, and resolving changes between two versions of a document or script.
The comparison engine is configurable, which is where most of its practical value sits. You can ignore whitespace changes, letter case, blank lines, and line-ending differences, so reformatting a file does not drown out the real edits. Three-way comparison adds a third pane for resolving conflicts when two people have changed the same file, and word-level highlighting shows exactly which words changed inside a rewritten line. Unpacker plugins open archives and office documents, and image files compare in a visual difference mode. Once satisfied, WinMerge can write a unified patch that another tool applies. Its role is narrow on purpose: unlike Ventoy, which prepares bootable drives, WinMerge exists only to show what changed between two versions and to help you decide what to keep.
The practical benefit of WinMerge is that reviewing changes stops being an exercise in memory. Instead of opening two files in separate windows and hunting for edits, you get a single view where added lines, removed lines, and modified words are color coded and can be accepted or rejected one at a time. Folder comparison answers a different, equally common question — what actually differs between these two trees — and does it recursively, with filters that hide generated files such as build output or logs. That makes it useful for verifying backups and deployments, not only for source code. Ignoring whitespace and case keeps reformatted files readable rather than noisy. Reports and patch files give you a record of what changed and a way to move the change somewhere else, and the command-line options allow the same comparison to run in a script. It is free, open source, and works on the files you already have.
Key capabilities and highlights.
Two files open in synchronized panes with line numbers, and every added, removed, or modified line is highlighted. You can scroll both panes together, jump between differences with keyboard shortcuts, and switch to word-level highlighting to see exactly which part of a rewritten line changed.
A third pane can be added when two versions have diverged from a common original, which is the situation that produces merge conflicts in shared work. You compare each version against the base, decide which changes to keep, and save the merged result as a new file.
Directory comparison walks subfolders and reports which files are identical, different, unique to one side, or missing entirely. Filters by name, wildcard, or regular expression hide folders such as build directories and logs, so comparing two project trees shows only the differences worth reviewing.
Whitespace, letter case, blank lines, and line-ending styles can each be ignored when they would otherwise dominate the view. Comments can be filtered out with a line filter, and files written in different text encodings still compare correctly, which keeps reformatted or converted documents usable.
Differences can be copied from one pane to the other with a single command, and text can be edited directly in either side before saving. That turns the comparison window into a working merge surface rather than a read-only report you have to retype into an editor.
Unpacker plugins let you compare inside compressed archives and supported document formats by extracting them to a temporary copy first. A zipped release folder or a pair of office documents can therefore be checked for differences without manually unpacking files and cleaning up afterwards.
Image files can be opened in a comparison view that places the two versions side by side and highlights the pixels that differ. It is a quick way to confirm that a re-export, resize, or compression step produced the intended result rather than a visual regression.
Comparisons can be exported as HTML, XML, CSV, or plain text reports, and folder comparisons can produce a unified patch that records every difference. Command-line parameters let the same jobs run from scripts or from version control clients configured to use it as the external diff tool.
Browse historical releases and previous builds.
Common questions about WinMerge.
WinMerge compares two files or two folders and shows the differences. Files open side by side so changed lines can be accepted or rejected individually, while folder comparisons list which files match, which differ, and which exist on only one side.
Yes. Folder comparison works recursively through subfolders and reports identical, different, left-only, and right-only files. Filters can exclude files by name, wildcard, or regular expression, which keeps generated output and log files out of the results.
Yes. A three-way comparison adds a third pane so you can compare two changed versions against their common original and decide which edits to keep. That covers the conflict situation that appears when two people modify the same file.
Yes. Options let you ignore whitespace changes, letter case, blank lines, and line-ending differences, for the whole comparison or per session. Ignoring these is useful when a file has been reformatted but the meaningful content is unchanged.
It can be registered with version control clients as the external diff and merge program, so comparisons launched from those clients open in WinMerge. Command-line options also let it run from scripts that need an automated file or folder comparison.
Yes, within limits. Image files open in a dedicated comparison view that highlights differing pixels, and unpacker plugins allow comparison inside supported archives and office documents. Binary files can also be compared to confirm whether they are identical.
WinMerge compares files and folders side by side, highlighting every difference and letting you copy changes between the two versions. It suits developers reviewing code changes, writers checking revised drafts, and anyone verifying that a folder copy matches its original.
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