Paste unified diff output and see a color-coded side-by-side or inline diff with line-level statistics.
Git Diff Visualizer turns pasted unified diff text into a color-coded review of files and hunks, available as adjacent old/new columns or as one inline stream. It also summarizes added and deleted lines, so a replacement contributes to both totals. The input must already be a unified diff, such as output from `git diff`; two unmarked source files are not compared. Because patches may contain unpublished code, the pasted text is processed in the browser and is not uploaded.
A concrete input and expected output from the current implementation.
Input
--- a/greeting.txt +++ b/greeting.txt @@ -1,2 +1,2 @@ Hello -Colour +Color
Expected output
Statistics: 1 addition and 1 deletion. The unchanged context is `Hello` at old line 1 and new line 1. `Colour` is removed from old line 2, and `Color` is added at new line 2. In side-by-side mode, those line-2 entries appear on the old and new sides.
The hunk header says both versions span two lines starting at line 1. The space-prefixed line is context, while the `-` and `+` lines each contribute one counted change; the path headers are not content changes.
The visualizer reads the `---` and `+++` file markers, then uses each `@@` hunk header to identify old and new line ranges. Within a hunk, a leading space marks unchanged context, `-` identifies an old-side removal, and `+` identifies a new-side addition. The file-marker lines themselves describe paths rather than content changes.
Side-by-side mode separates the old and new line sequences into neighboring columns; inline mode preserves the patch's single vertical sequence. In either presentation, color distinguishes context, removals, and additions. The statistics are line based. Replacing one complete line with another is represented by one deletion plus one addition, even when only one character changed.
No. This viewer expects unified diff text with file and hunk markers; it does not derive a comparison from two independent file bodies. Produce a patch first, for example with `git diff` in a repository or `git diff --no-index old.txt new.txt`, then paste that command's output.
Unified diff records the original line with a `-` prefix and its replacement with a `+` prefix. Git Diff Visualizer reports those records separately, so changing `Colour` to `Color` yields one deletion and one addition. The side-by-side view can place them opposite each other, but the statistics do not collapse them into one modification.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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Visualize unified diffs and patch files with color-coded additions and deletions.