diffchecker.ioText Diff Checker
Compare two pieces of text and instantly highlight every addition, deletion, and change. Free, private — runs entirely in your browser.
Drag and drop file here
or click to browse (max 5MB text)
Drag and drop file here
or click to browse (max 5MB text)
Paste text above to see differences
Frequently Asked Questions
How do I compare two texts online?
Paste your original text in the left box and the changed text in the right box, then click "Find Difference". The tool will instantly highlight every added, removed, and changed line.
Is diffchecker.io free to use?
Yes, diffchecker.io is completely free to use with no account required. All processing happens in your browser so your data stays private and is never sent to a server.
What is a diff checker?
A diff checker is a tool that compares two pieces of text and highlights the differences between them. It shows additions in green and deletions in red, making it easy to see exactly what changed.
Can I compare code or JSON files?
Yes! diffchecker.io supports text comparison, code comparison with syntax highlighting for 50+ languages, and JSON comparison with automatic formatting and validation. Use the navigation to switch tools.
Does my text get stored anywhere?
No. All diff computations run entirely inside your browser using a Web Worker. Your text is never transmitted to any server, ensuring complete privacy.
Why Use diffchecker.io?
100% Private
All comparisons happen in your browser. Your text never leaves your device.
Syntax Highlighting
Compare code in 50+ languages with full color syntax highlighting via Shiki.
Split & Unified Views
Choose between side-by-side split view or compact unified diff view.
JSON Aware
Automatically formats and validates JSON before comparing, catching syntax errors first.
Shareable Links
Generate a shareable URL that encodes your diff for easy collaboration.
No Sign-up Required
Open the tool and start diffing immediately. No account or email needed.