Text Diff Checker

It uses a line-by-line comparison that identifies additions (green), deletions (red), and unchanged lines. Lines are compared after normalizing whitespace for accurate results.

Yes. The diff checker works well with any text including source code, configuration files, documentation, and prose. It preserves formatting and whitespace.

There is no hard limit, but very large texts (over 100,000 lines) may be slow since all processing happens in your browser.

Yes, but performance degrades with very large inputs because all processing runs in the browser. For files over 10,000 lines, use the command-line "diff" tool or "git diff" which are optimized for large texts. This tool is ideal for quick comparisons of config snippets, API responses, and document versions.

The diff uses color to indicate added (green background) and removed (red background) lines. It does not apply language-specific syntax highlighting within each line. For code review with full syntax highlighting, use a diff tool integrated into your IDE or GitHub's pull request diff view.

Git diff tracks changes between versions in a repository using a unified diff format with @@ hunk headers. This tool compares two arbitrary text inputs directly, without any repository context. It is useful when you do not have git history -- for example, comparing two API responses, two config file versions pasted from different sources, or two drafts of a document.