Diff Checker — free online tool
Compare two versions of a contract paragraph, config file, or translation side by side with line-level highlights.
When to use Diff Checker
Compare two policy drafts, config files, or contract versions and spot what changed.
Useful when you want a quick answer without pasting sensitive data into random chat bots.
What Diff Checker does not do
Line-oriented text diff. Not a Git merge tool, binary diff, or Word track-changes importer.
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.
Example
Paste yesterday’s config and today’s config to spot the one changed port.
Related tools on Webtoolshop
- JSON Formatter — Pretty-print both sides before diffing API JSON.
Limitations
Line diff. Whitespace-only changes may still highlight. Not a three-way merge.
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
What does the Diff Checker not do?
Line-oriented text diff. Not a Git merge tool, binary diff, or Word track-changes importer.
Give me a concrete example for the Diff Checker.
Paste yesterday’s config and today’s config to spot the one changed port.
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.