Diff Checker
Paste an original and a changed version side by side to see a line-by-line diff — added lines and removed lines highlighted, updated as you type.
Overview
Diff Checker is built for code, config files, and structured text, where a single line is the meaningful unit of change rather than a single word. Paste the original on one side and the changed version on the other, and get back a unified, git-style view with each line marked as added, removed, or unchanged — the same shape as a `git diff`, without needing a local git repository.
Examples
A changed config line
port = 3000 host = localhost debug = true
port = 3002 host = localhost debug = false
How It Works
- Paste the original text into the left box.
- Paste the changed text into the right box.
- Review the unified diff below — lines prefixed with + were added, lines prefixed with - were removed.
FAQ
No. The diff is computed entirely in your browser using JavaScript — nothing you paste is transmitted anywhere.
Diff Checker compares line by line in a unified, git-style view, suited to code and config files. Text Compare highlights differences word by word, suited to prose and documents.
Yes — the comparison is exact, so a line with trailing whitespace is treated as different from the same line without it, matching how most diff tools (including git) behave by default.
No artificial limit, though very large files may take a moment to re-diff on each keystroke.