Text Diff Checker
Compare two blocks of text and highlight the differences line by line — 100% in your browser.
Enter text in both panes to see the differences.
About Text Diff Checker
Paste your original and changed text and the differences are highlighted instantly: added lines in green, removed lines in red, with inline word-level highlighting so you can see exactly which words changed within a line. Switch between a side-by-side and a unified view, and see a running count of additions and deletions.
Use the ignore-case and ignore-whitespace options to focus on meaningful changes. The comparison uses a longest-common-subsequence diff and runs entirely in your browser — your text is never uploaded, which makes it safe for code, contracts and other sensitive content.
Spot a one-word change
A: The quick brown fox B: The quick red fox
Line 1 changed: “brown” → “red” (highlighted inline)
Identical lines are shown for context; only the differing words are marked.
Frequently asked questions
Does it highlight changes within a line?
Yes. When a line is modified, a word-level diff highlights exactly which words were added or removed, not just the whole line.
Can I ignore case or whitespace?
Yes. Toggle “Ignore case” and “Ignore whitespace” to treat differences in capitalization or spacing/indentation as equal.
What's the difference between side-by-side and unified view?
Side-by-side shows the two texts in parallel columns; unified stacks removals and additions in a single column with - and + markers, like a code review diff.
Is my text uploaded to a server?
No. The entire comparison happens locally in your browser, so nothing is transmitted or stored.