Diff Merger

The Diff Merger tool compares two texts line by line and displays differences with clear color coding. Added lines are shown in green, removed lines in red, and unchanged lines remain as-is. For each diff block, you can choose from three merge options: 'use left (Original)', 'use right (Modified)', or 'use both'. It uses the LCS (Longest Common Subsequence) algorithm for accurate diff detection and runs entirely in the browser without external libraries.

This tool is ideal for resolving Git merge conflicts, merging configuration files, and reviewing document edits—any situation where you need to manually merge two text versions. Block-by-block flexible merge operations handle complex multi-stage changes, and quick action buttons let you efficiently change selections across all blocks. All processing happens client-side, so your text data is never sent to any server and can be used safely in security-sensitive environments.