Compare two texts.

Paste two versions of anything — code, config, logs, prose — and see exactly what changed, line by line, with added and removed lines highlighted. Real LCS diff, computed in your browser.

See the change, not the haystack

Eyeballing two near-identical files is how subtle changes slip through — a flipped flag, a removed line, an extra block. A real diff does the comparison for you and shows only what moved, which is why it underpins code review, config audits, and “what changed between the working version and the broken one.” Because this one runs locally, you can safely diff production configs and logs that you would never paste into someone else’s server.