Compare two texts to see additions, deletions, and changes highlighted word-by-word. Runs entirely in your browser.
Paste two pieces of text and click Compare. The tool compares line by line and then highlights the specific words that changed within each modified line. Additions are shown in green, deletions in red, and unchanged content is dimmed.
The tool first compares texts line by line using the LCS (Longest Common Subsequence) algorithm. When it finds a deletion paired with a nearby addition, it performs a word-level diff to highlight exactly which words changed — not just the whole line.
Yes. The tool uses a monospace font and preserves whitespace, making it ideal for comparing code, config files, JSON, or any structured text. For side-by-side code comparison, see the Code Diff Checker tool.
Yes. When two lines are similar but have some changes, the tool highlights the specific words that were added or removed, with strikethrough on removed words and highlighting on added words.
No. All comparison runs in your browser using JavaScript. Nothing is sent to any server. Your text never leaves your device.