Diff Checker & Comparator

High-precision side-by-side and unified diff checker for code, JSON, YAML, configs, and text documents.

Private by architecture: All processing is 100% client-side memory. Your data never leaves this browser tab.

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Real-time diff Hide whitespace changes Hide unchanged lines Auto-format JSON before diff

Original Text (Left)

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Changed Text (Right)

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Visual Diff Comparison

Paste or edit Left and Right text to view visual diff.