Diff Checker

Shows line-based differences between two texts. Toolbar icon opens in a new tab.

Diff Checker helps you compare two text blocks quickly and clearly. Paste your texts into the left and right editors, then run comparison to see: Added lines (+) Removed lines (-) Unchanged lines Key features: Clean line-by-line diff view with a side-by-side summary (Text 1 vs Text 2) Built-in line numbers in both editors Swap left and right with one click Same / Added / Removed counts in the toolbar after you compare Difference navigation (next/previous) Copy diff summary with one click Drag the splitter to resize the editors vs the diff summary Fullscreen diff summary (press Esc to exit) Light and dark theme Settings: language (Auto / English / Turkish) and open in a new tab or in the popup Full-page mode for larger comparisons (when opened in a tab) What’s new (v1.1.0) Side-by-side diff columns, swap columns, live change statistics, resizable layout, fullscreen for the summary, dark mode, and a settings panel for language plus tab vs popup open mode. Privacy: All comparisons run locally in your browser. Your text is not sent to external servers.