Yes — completely free, no sign-up, unlimited comparisons.
It compares your texts line by line: removed lines show in red, added lines in green, unchanged lines in gray.
No. The diff runs entirely in your browser with JavaScript — nothing you paste ever leaves your device.
Yes — it works great for code, config files, articles, contracts and any other text.
"Lines changed" counts added plus removed lines; "Characters changed" totals the characters in those lines.
