HTMLText Diff Viewer
Paste two texts side-by-side and instantly see what changed — additions highlighted in green, deletions in red, unchanged lines in grey. It also builds a compact change review pack with counts, changed-line ranges, risk prompts, and a PR/release checklist that intentionally omits raw changed line contents.
Ctrl+Enter to run | Ctrl+K to switch tools | Recent button shows input history
Repeating this work? Turn this kind of browser utility into an API batch, MCP prompt, extension workflow, or shared team recipe.
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How does the diff algorithm work?
This tool uses a longest-common-subsequence (LCS) diff, the same approach used by git diff and Unix diff. It finds the minimal set of additions and deletions to transform text A into text B.
What is the change review pack?
It is a copyable markdown handoff for PRs, tickets, and release notes. The pack includes counts, line ranges, risk prompts, and a checklist, but omits raw changed line contents so you can share review context with less accidental data exposure.
Can I diff code?
Yes — the diff is purely text-based, so it works on any language. For code, pair the review pack with the formatter, parser, test, or smoke path that verifies the changed file type.