A free online text diff checker. Compare two blocks of text and see line-by-line differences highlighted in green (added) and red (removed). Toggle between unified and split view. View statistics on added, removed, and unchanged lines.
Paste the original text in the left textarea.
Paste the modified text in the right textarea.
View the highlighted differences instantly.
Toggle between unified and split view, or swap texts.
The tool uses the Longest Common Subsequence (LCS) algorithm to find the longest sequence of lines shared between both texts, then marks the remaining lines as additions or deletions.
Yes. The diff checker works with any text, including code. Paste your original and modified code to see which lines were added or removed.
Free online tool — works in your browser, no sign-up required. Start using it right now.
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