Text Diff Checker
Compare two text blocks locally with a line-by-line diff.
Paste two versions of text to compare them line by line. The diff runs locally in your browser and does not upload your text.
How it works
Paste the earlier version into Original text and the newer version into Changed text. The checker compares the two values line by line in your browser.
When Whitespace-sensitive comparison is enabled, spaces and tabs are part of the comparison. When it is disabled, leading and trailing whitespace is ignored and repeated whitespace inside a line is treated as a single space.
The output uses common diff prefixes: a blank leading space means the line is unchanged, - means the line was removed from the original text, and + means the line was added in the changed text.
The status line counts added, removed, and unchanged lines. The checker is intended for snippets, notes, configuration files, logs, and small documents.
For responsive browser use, compare up to 1,200 lines per side. It is not a full source-control diff tool, does not detect moved blocks, and does not produce word-level changes inside a line.
