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Paste two texts and instantly see every difference. Additions highlighted in green, deletions in red. 100% private — your text never leaves your browser.
Compare two texts side by side and find every difference in seconds. Our diff algorithm highlights additions, deletions, and changes clearly.
All text comparison happens directly in your browser. Your data never leaves your device — no server processing, no storage, no tracking.
Switch between unified diff and side-by-side views. Unified view shows changes inline, while side-by-side displays original and modified text in parallel.
See exactly which words changed within each line. Our word-level diff highlighting makes it easy to spot even the smallest modifications.
Efficiently compare texts with 100,000+ lines. Our Web Worker architecture and virtualized rendering ensure smooth performance at any scale.
Copy the diff output to your clipboard or download it as a standard patch file. Easy to share comparison results with your team.
TextCompare is a free online text diff checker that helps you find differences between two texts quickly and accurately. Whether you're comparing documents, reviewing code changes, or checking text revisions, our diff tool provides clear, color-coded results that make it easy to spot every change.
Unlike other text comparison tools, TextCompare processes everything directly in your browser using Web Workers. This means your text data never leaves your device — there's no server-side processing, no data storage, and no privacy concerns. It also means the tool works offline once loaded and can handle very large files without performance issues.
Our diff engine supports multiple comparison modes including line-by-line, word-by-word, and character-by-character analysis. Use the side-by-side text comparison view to compare two texts next to each other, or the unified view for a compact diff similar to Git. Word-level inline highlighting shows exactly which parts of each line changed, making it the easiest way to find differences between two texts.