Text
Diff

Compare two text blocks and highlight differences line by line.

Input

Diff Output

0 added0 removed1 unchanged

Enter text in both fields to see the diff.

Learn more

How does a computer figure out what changed between two versions of text?

Was this useful?

Related Tools

Base64 Encode/Decode

Convert plain text to Base64 and back in one panel.

Markdown to HTML

Render markdown into clean, copy-ready HTML output.

Regex Tester

Test regular expressions with real-time match highlighting, capture groups, and plain-English explanations.

Design System Generator

Turn two or three brand colors into semantic design tokens with live previews and CSS, Tailwind, SCSS, and JSON exports.

JSON Formatter

Format and validate JSON quickly with clean output and errors.

Epoch Converter

Convert Unix timestamps to readable date and time values.

Frequently Asked Questions

The tool uses a longest common subsequence (LCS) algorithm to find the optimal alignment between lines. This produces minimal, accurate diffs similar to the Unix diff command.

Yes. The diff output recalculates instantly every time you change either input field. There is no button to click — results appear as you type or paste.

Yes. The diff output uses a monospace font and preserves whitespace, making it suitable for comparing code, configuration files, JSON, and any line-based text.

Green lines with a + sign were added in the modified text. Red strikethrough lines with a - sign were removed from the original. White lines are unchanged.