What this tool does
Compare two text blocks with line-level and word-level highlighting to review edits, prompts, docs, or config changes.
Compare text snippets with line and word-level highlighting.
Compare two text blocks with line-level and word-level highlighting to review edits, prompts, docs, or config changes.
Paste the original text on one side and the updated text on the other side to see line-by-line and word-level differences immediately.
Review prompt changes before re-running an LLM workflow. Compare environment configs or deployment notes quickly. Spot wording changes in docs, runbooks, or release updates.
Review prompt changes before re-running an LLM workflow.
Compare environment configs or deployment notes quickly.
Spot wording changes in docs, runbooks, or release updates.
Left: feature flag is false Right: feature flag is true
Changed lines are highlighted, with word-level additions and removals shown inline.
Yes. Paste any plain text including JSON, YAML, config files, or markdown to see line-by-line and word-level differences.
Any plain text: prompts, JSON snippets, release notes, configs, docs, or copied CLI output.
Yes. Diff Checker works in the browser so you can enter data, review the result, and copy the output without needing a separate desktop app.
Found a bug, hit a confusing edge case, or want another tool? Send quick feedback about Diff Checker.