Diff Checker
Compare two text blocks and highlight added, removed and changed lines.
About Diff Checker
Compare two text blocks and highlight added, removed and changed lines. Processing is designed to happen locally in your browser where the selected feature supports local processing. Review the result before replacing your original file.
How to Use Diff Checker
Select your input, choose the available options, run the tool, preview the result when available, and download the output.
📥 Input → ⚙️ Process → 📤 Result
Input
Your selected file or text
Process
Runs in your browser on supported features.
Result
A downloadable or copyable result.
❓ Frequently Asked Questions
Is Diff Checker private?
For browser-based processing, your files and text are handled on your device and are not sent to a ToolBoxly processing server.
Is Diff Checker free?
Yes. ToolBoxly provides this tool without a required account.
Does it work on mobile?
It works in modern mobile browsers, although large files can require more device memory.