Paste two pieces of text and see exactly what changed between them, line by line.

Side-by-side and unified text diff viewer. Shows added, removed, and unchanged lines with colour coding. Configurable context lines.

Implements the Myers diff algorithm (An O(ND) Difference Algorithm and Its Variations, Eugene Myers, 1986) for minimum edit distance line-level diff. Added lines highlighted in green, removed in red. Unified diff output follows the standard hunk format (@@ -a,b +c,d @@ context). Character-level diff optionally applied within changed lines using a second Myers pass.