diffly

Free online diff checker & text compare tool. Paste two texts, find every difference, merge changes — with syntax highlighting for 20+ languages. 100% private: your text never leaves your browser.

• ↔️ Split & unified diff views
• 🔀 Cherry-pick or take-all merge
• 🎨 Auto-detect 20+ languages
• 📋 Export to .patch or HTML report
• 🔗 Share via link (text stays in the URL fragment, never sent to a server)
• 🔒 No server, no tracking, no sign-up
• ⚡ 10k-line diffs in ~1 second