Diff Checker — free online tool
Compare two versions of a contract paragraph, config file, or translation side by side with line-level highlights.
Useful when you want a quick answer without pasting sensitive data into random chat bots.
How to use Diff Checker
- Paste the original text in the left pane of the Diff Checker.
- Paste the revised text in the right pane.
- Run compare to highlight added, removed, and changed lines.
- Scroll the output to review contract or config edits before publishing.
Practical tips
- Compare two contract drafts to catch a single changed clause or number.
- Trim trailing whitespace first, or invisible spaces will show as false differences.
- Line-level diffs work best on text; reformatted code may flag every line as changed.
Limitations
Diff Checker runs on text in your tab only—there is no cloud save, version history, or collaboration. Copy results before closing the page.
Privacy & data
We do not run a database on this static site. Text and generated output exist only in your tab until you close or refresh the page.
Frequently asked questions about Diff Checker
Is the Diff Checker free on Webtoolshop?
Yes. There is no sign-in and no paywall on this page. We may show advertising on some layouts to cover hosting.
Can I use the Diff Checker on a phone?
Yes for light tasks. Very long pasted text, huge images, or multi-megabyte PDFs are easier on a laptop with more memory.
Why did the Diff Checker fail or look wrong?
Try a smaller file, fewer pasted characters, or an updated browser. Extensions that block scripts or downloads sometimes interfere—test in a private window if results never appear.
Does Webtoolshop store text I paste into the Diff Checker?
We do not run a database on this static site. Text and generated output exist only in your tab until you close or refresh the page.
Diff Checker
Line-by-line comparison — green = same, amber/red = different.