Text and config comparison
Paste two versions of a text, a configuration or some output to see exactly what changed, line by line with the changed words highlighted, and take away a standard patch.
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Reading a unified diff
Lines starting with - were removed and + were added; the rest is context. A header like @@ -12,5 +12,6 @@ means “from line 12, five lines on the left became six on the right”. The patch can be applied with git apply or patch -p0.
How is the comparison made?
With the Myers algorithm that git and GNU diff are based on, which finds the fewest lines to add and remove. Within a changed line, the words that differ are highlighted.
What does “ignore whitespace” do?
Lines that differ only in spacing or indentation count as the same, which is useful for configuration re-indented by an editor. Windows and Unix line endings are always treated as equal.
Are my texts sent anywhere?
No. The comparison runs in your browser and nothing is stored.