Diff Checker
Compare two text blocks side by side in your browser. Highlight additions and deletions — no upload, free online diff checker.
Compare text locally without a cloud diff
See what changed between two versions of a config, contract clause, or log excerpt. Nothing is sent to a server — useful for confidential drafts.
What you can do with it
- Review config changes
- Paste old and new environment snippets before deploying.
- Spot edits in pasted content
- Compare two email drafts or policy paragraphs without leaving sensitive text on a diff SaaS.
How to compare text
- Paste the original text on the left.
- Paste the revised text on the right.
- Review highlighted additions and deletions.
Side-by-side diff without a paste site
Legal clauses, HR policies, and production configs are poor candidates for cloud diff tools. Comparing locally highlights line changes while both versions stay on your device.
Line diff vs semantic merge
This tool shows textual additions and removals. For structured JSON, format both sides with JSON Formatter first so diffs align on pretty-printed lines.
Related reading and tools
- JSON Formatter — Pretty-print JSON before diffing nested payloads.
- Word Counter — Measure length after trimming diff output.
- Developer tools — All browser-local developer utilities.