How to compare two pieces of text
Paste the older version on the left and the newer version on the right, then choose Compare text. Added lines are marked with +, removed lines are marked with -, and unchanged lines keep their original line numbers.
Use Ignore whitespace when indentation or extra spacing should not count as a change. Use Ignore case when capitalization differences should be treated as unchanged.
What this diff is best for
This tool is built for quick browser-side comparisons: copied notes, lists, short config blocks, small code snippets, product copy, and before-and-after text. It does not replace a full developer diff tool for huge files or syntax-aware code review.
The result is line based. If one word changes inside a long line, that whole line appears as changed.
Privacy and safety
Both text inputs are processed locally in the browser. MyTool0 does not upload either version, store the comparison, send QR-like content, or send the diff output to analytics.
HTML-like text is treated as plain text in the result view. It is displayed safely and is not executed.
Practical limits
The browser version applies line, character, and comparison-size limits before running the diff algorithm. If the pasted text is too large, the tool shows a recoverable error instead of freezing the page.