The Diff Checker compares two text documents side-by-side and highlights all differences. Perfect for writers, developers, and editors who need to track changes between document versions. All comparisons happen locally in your browser — your content never leaves your device.
Zero server lag. All calculations run locally on your device for maximum speed.
Your data never leaves your device. No uploads, no servers, no tracking.
This tool handles plain text only. It works with code, prose, or any text content (no rich formatting).
Yes, whitespace differences are considered changes. The tool compares text line by line including spaces and tabs.
Copy and paste the contents of each file into the two text boxes. The tool compares the text content, not the file metadata.
Yes.