Text Diff Checker

Paste two versions of any text — code, config, a contract, an email — and see exactly what changed. The diff updates as you type, with a side-by-side view and an inline (unified) view, plus a summary of added, removed, and changed lines.

• Line-by-line diff using a longest-common-subsequence algorithm — no server, nothing leaves your browser
• Side-by-side view with line numbers, or an inline unified view with +/- markers
• Adjacent removals and additions are merged into single "changed" blocks, so edits read naturally
• Summary counts: lines added, removed, and changed
• Swap the two sides, copy the unified diff, or download it as a .diff file
• Everything stays in your browser — export or import your comparison as JSON