Diffmate

Compare million-row CSV & Excel files in your browser — free

Productivity Developer Tools Vibe coding

Sovereignty Grade

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About

Free browser tool to compare CSV, Excel, PDF & text files. No install, no signup, files never leave your device. Drop two files and see every change highlighted side by side. Handles million-row files without freezing, powered by a Web Worker diff engine. Added, modified, and deleted lines are color-coded for instant review.