JSON Diff
Compare two JSON documents and see every key that changed.
JSON
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Text Diff
Compare two blocks of text and see exactly what changed.
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Questions
Why does a one-word change not mark the whole line as different?
Changed lines get a second pass that diffs the two lines character by character, so only the part that actually changed is highlighted. A line-only diff would mark the entire line red and green for a single-character edit, which makes real changes hard to spot in a wall of colour.
Why does whitespace matter by default?
Because trailing spaces and tab-versus-space differences are frequently exactly the bug you are trying to find - in YAML, Makefiles and diffs against a linter's output, whitespace is content. Turn on "Ignore whitespace" when you specifically want to compare only the visible words.
Is there a size limit?
Yes: 20,000 lines per side. The diff algorithm is fast in practice but has a worst case proportional to how different the two sides are, so a hard limit keeps a pathological paste from freezing the tab.
Related tools
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