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Compare two blocks of text side-by-side and highlight added, removed, and unchanged lines.
A browser-based diff checker that compares two text inputs line-by-line using an LCS (Longest Common Subsequence) algorithm and displays results in a side-by-side view with color-coded highlighting. Added lines appear in green, removed lines in red, and unchanged lines in white. Features include line numbers, summary badges (added/removed/unchanged counts), swap inputs, load sample, and clear. Runs entirely client-side with zero dependencies — your text never leaves your machine.
Encode and decode Base64 strings in your browser — supports plain text and file uploads with Unicode handling.
Visual gradient editor — pick colors, adjust stops, choose direction, and copy the CSS with one click.
Generate beautiful color schemes from any base color — complementary, analogous, triadic, and more.
Diff Checker is a free online tool available on BuildHub. Compare two blocks of text side-by-side and highlight added, removed, and unchanged lines.
This tool is designed for developers, engineers, and technical professionals who want to speed up their daily coding tasks. It runs entirely in your browser — no downloads, no sign-ups, and no data sent to external servers.
Whether you're working on a quick personal project or a professional deliverable, Diff Checker helps you get results faster with zero friction.
Yes, 100% free with no hidden costs. You don't need to create an account or provide payment information. Just open the tool and start using it.
Absolutely. Diff Checker processes everything directly in your browser. Your input data is never uploaded to our servers or stored anywhere.
Yes. The tool is fully responsive and works on smartphones, tablets, and desktop browsers. No app installation required.