Are duplicates collapsed?

Yes, each result section shows every value once.

Can I ignore letter casing?

Turn on the case-insensitive option to treat Apple and apple as the same value.

Do my lists leave the browser?

No, the comparison runs entirely on your device.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

List Comparator

Compare two lists and see common, A-only and B-only items.

Support

Works Offline

Privacy First

No Login

No API

Case-insensitive

Trim lines

Sort results

List A

3 lines

List B

3 lines

In both

Only A

Only B

In both lists

banana
cherry

Only in A

apple

Only in B

date

About the List Comparator

Paste two lists and instantly get the intersection plus the items unique to each side. Case-insensitive matching, trimming and sorted results make it easy to diff exports, keyword sets, emails or IDs.

Examples

Intersection

apple
banana vs banana
date

Output

In both: banana

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-24 · Runs entirely in your browser