Text Diff/Compare

Compare two texts side-by-side and see differences highlighted with character-level precision.

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About Text Diff/Compare

How It Works

This tool uses a longest common subsequence (LCS) algorithm to compare two texts line-by-line, then applies character-level diffing within changed lines to highlight exactly what was modified. All processing runs in your browser — no data is sent to any server.

Color Coding

• Green — lines or characters added in the modified version
• Red — lines or characters removed from the original
• No highlight — lines that remained unchanged

View Modes

• Side-by-Side — shows original and modified in adjacent panels with synchronized scrolling
• Unified — shows all changes in a single panel with +/- prefixes, similar to Git diff

Use Cases

• Comparing different versions of source code
• Reviewing edits in documents or configuration files
• Spotting changes between API responses or JSON data
• Verifying translations or content updates

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