Text Diff Checker

Diff is computed server-side using the Myers algorithm via jfcherng/php-diff with character-level highlighting — showing exactly which characters changed within each modified line, not just which lines changed.

• Maximum 5,000 lines per input panel (500 KB character limit).
• The exported .patch file follows the unified diff format (---/+++ headers, @@ hunks) and is compatible with git apply and the patch command.
• Ignore whitespace treats runs of spaces/tabs as equivalent. Ignore case performs a case-insensitive comparison.