Compare Two Lists A and B Online Without Excel
Instantly find items in both lists, A only, B only, and the full union locally in your browser.
List A
0 itemsList B
0 itemsResult
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Why Thousands Choose List Comparator
Blazing Fast – Truly Instant Results
Calculate merged, cleaned, and deduplicated lists in milliseconds. Even lists with thousands of lines finish almost instantly.
Private & Secure – Zero Data Upload
No upload means zero privacy risk. This tool runs 100% locally in your browser, so your data never leaves your device.
Zero Friction – Just Paste, Compare & Copy
No software to install, no account to create. Paste your two lists, click Compare, and get your result in one second.
Unlimited & Completely Free
100% free list tool with no hidden fees. Unlimited line count, unlimited usage – no registration required.
Four Clear Comparison Views
Quickly switch between items in both lists, A only, B only, and the full union without losing your formatting controls.
Works With Everything
Numbers, emails, keywords, URLs, SKUs, names – any line-separated text. Compare any type of list instantly.
Common Use Cases
Merge Multiple Lists
Combine two contact lists, keyword lists, or any data sets. Remove duplicates and get a clean unified list.
Find Shared Items
See the values that appear in both List A and List B instantly.
Find A Only and B Only
Spot items unique to List A or unique to List B without manual filtering.
Remove Duplicates
Clean up your lists by removing duplicate entries. Simply check the remove duplicates option for either list.
Compare Two Versions
Review exactly what stayed the same, what only exists in A, and what only exists in B.
Prepare Data for Cleanup
Format and standardize line-based text before exporting it to another workflow or tool.
Comparison Modes
A ? B (in A or B)
Combine all unique items from both lists into one result.
A ? B (in both A and B)
Return only the items that appear in both lists.
A Only
Return items that appear in List A but not in List B.
B Only
Return items that appear in List B but not in List A.
Formatting Controls
Optionally ignore case, spaces, zeroes, and adjust sort order or capitalization before reviewing results.
Frequently Asked Questions
How do I compare two lists online for free?
Paste your values into List A and List B, then click the result type you want to view. Your comparison updates instantly in the browser.
What result types can I view?
You can switch between items in both lists, A only, B only, and the full union of A and B.
Is my list data uploaded to a server?
No, all processing happens in your browser. Your list data never leaves your device.
What is the maximum list size?
There is no strict limit. The tool handles thousands of items efficiently. Very large lists may take a moment to process.
Are duplicate lines removed automatically?
Yes. Results are shown as unique values so repeated lines do not appear multiple times in the same result view.
How do I save my result?
Click the 'Copy' button to copy the result to your clipboard, then paste it anywhere you need.
Does the list comparator work on mobile?
Yes, the interface is fully responsive and works on smartphones and tablets.