Diff Checker
Compare text and code side by side and see exactly what changed.
Differences
Your comparison will appear here
Paste text or code into both fields to see exactly what changed.
What does this Diff Checker do?
Compare text or source code right in your browser. Only changed words are highlighted within an edited line; fully added or removed lines remain clearly marked. Your content is processed on your device and is never uploaded.
How to compare text or code
- 1Paste the first version into Original text or code.
- 2Paste the updated version into Revised text or code.
- 3Review the word-level highlights and line numbers.
- 4Use the options to ignore whitespace or letter case when needed.
Highlights exact words changed in text, code, or configuration lines
Keeps surrounding text readable so each edit is easy to spot
Works for prose, source code, and configuration text
Runs in your browser; your text is not uploaded
Related digital tools
Compare versions of prose, code, or configuration and see exactly what changed.
Questions about Diff Checker?
Is my text or code uploaded?
- No. Text and code stay in your browser and are never sent to a server.
How are differences shown?
- Unchanged words stay neutral. Only changed words within edited lines are highlighted; fully added or removed lines are marked in green or red.
Can I ignore spaces and tabs?
- Yes. Ignore whitespace removes spaces and tabs within lines. Line breaks still separate lines.
Can I compare code?
- Yes. Paste source code or configuration text into the two fields. The tool compares lines and highlights only the changed words within edited lines.
Does it support large texts?
- It works best for documents and code of moderate size. Very large pastes may use a simplified comparison to keep the page responsive.