Compare Two Lists
Free online list comparison tool. Find the difference, intersection, symmetric difference, or union between two lists.
About This Free Online Compare Two Lists
Our free list comparison tool shows you exactly how two lists differ, finding the items they share, the items unique to the first list, and the items unique to the second. Paste your two lists, one item per line, and the tool compares them instantly, giving you a clear breakdown you can act on. It is invaluable for reconciling data, finding what changed between two versions, checking which entries are missing or new, deduplicating across sources, and auditing lists of emails, IDs, or keywords. You can usually choose to ignore case and trim whitespace so near-identical items match. Doing this comparison by hand is slow and error-prone for long lists. Everything runs locally in your browser, so it is immediate, free, requires no signup, and your data is never uploaded.
Features of Our Compare Two Lists
- Four comparison modes: Difference, Intersection, Symmetric Difference, Union
- Dual input areas for List A and List B
- Case-sensitive toggle
- Real-time results with line counts
- 100% client-side processing
How to Use the Compare Two Lists
The Compare Two Lists works right in your browser — no signup, no installation. Follow these steps:
- Paste your first list into List A (one item per line).
- Paste your second list into List B (one item per line).
- Select the comparison mode (Difference, Intersection, etc.).
- Read the results in the output area with line count shown.
Frequently Asked Questions About Compare Two Lists
What is the difference between Difference and Symmetric Difference?
Difference (A - B) shows items in List A but not in List B. Symmetric Difference shows items that are in either list but not in both — essentially the combined unique items from both lists excluding the intersection.
Is the comparison case-sensitive?
By default, comparisons are case-sensitive. You can toggle case-insensitive mode using the checkbox.
Why Choose the Compare Two Lists?
Bulk text edits that would take ages by hand happen in one step with the Compare Two Lists. It applies your changes the moment you make them, entirely in the browser, so your content stays on your device and the result is ready to copy immediately.