Compare two blocks of text side-by-side or in unified view. See added, removed, and unchanged lines instantly.
The Diff Checker compares two text inputs and highlights every line that was added, removed, or unchanged. It uses a standard LCS (Longest Common Subsequence) algorithm — the same approach used by Git and most version control systems.
Paste your original text into the left panel (A) and your modified text into the right panel (B), then click Compare. Added lines appear in green, removed lines in red, and unchanged lines are dimmed. Switch between split view and unified view using the toggle.
Checking what changed between two versions of a document, comparing API responses, reviewing configuration file changes, or spotting differences in code snippets.