Diff Checker — Compare Text
Paste original and changed text to see exactly which lines were added or removed.
Comparison runs entirely in your browser — nothing is uploaded. Line-level diff; up to about 2,000 lines per side.
How it works
The diff shows removed lines in red with a minus, added lines in green with a plus, and unchanged lines dimmed for context — the same convention as git and code review tools. Typical uses: spotting what changed between two versions of a config file, checking a contract revision against the original, or verifying that a copy-paste didn't silently alter anything.
FAQ
Is my text uploaded?
No. The comparison uses a longest-common-subsequence algorithm running in your browser's JavaScript — sensitive contracts, configs, or code never leave your device.
Does it show differences within a line?
This version compares whole lines: a changed line appears as a removal plus an addition. That's the same granularity as git's default diff and is usually enough to spot what changed.
How large can the texts be?
About 2,000 lines per side. The algorithm compares every line against every other, so the limit keeps the comparison instant rather than freezing your tab.