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A simple list difference checker to compare two lists and instantly see what’s different. This listdiff tool helps you diff lists by showing unique items, common entries, and everything in between.
Perfect for list comparison tasks like comparing spreadsheet columns, email lists, or product SKUs. Use this tool to list compare online — everything runs locally in your browser, keeping your data private.
- Trim Whitespace — Removes extra spaces before comparing items
- Case Sensitive — Treats "Apple" and "apple" as different when enabled
- Normalize Spaces — Converts multiple spaces to single space
- Ignore Leading Zeros — Treats "007" and "7" as identical
- Remove Duplicates — Shows each item only once in output
- Sort & Case Options — Sort A-Z/Z-A…
1
1
A simple list difference checker to compare two lists and instantly see what’s different. This listdiff tool helps you diff lists by showing unique items, common entries, and everything in between.
Perfect for list comparison tasks like comparing spreadsheet columns, email lists, or product SKUs. Use this tool to list compare online — everything runs locally in your browser, keeping your data private.
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Trim Whitespace — Removes extra spaces before comparing items
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Case Sensitive — Treats "Apple" and "apple" as different when enabled
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Normalize Spaces — Converts multiple spaces to single space
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Ignore Leading Zeros — Treats "007" and "7" as identical
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Remove Duplicates — Shows each item only once in output
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Sort & Case Options — Sort A-Z/Z-A, convert to upper/lower/title case
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Only in A — Items missing from List B
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Only in B — Items missing from List A
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Common — Items present in both lists
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Diff — All differences between the lists (symmetric difference)
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All Items — Merged list with duplicates removed
Frequently Asked Questions
What is a list diff tool?
A list diff tool (also called listdiff) performs list comparison between two datasets. It works as a list difference checker, identifying items unique to each list, common items, and all differences.
How can you compare two lists?
To compare two list items, paste your first list in List A and second in List B (one item per line). Results show items only in A, only in B, common items, and all differences instantly.
How to compare lists online for free?
Use this free list compare tool — no signup needed. Simply paste your data to diff lists instantly. Everything runs in your browser, keeping your data private.
How to find matches in two lists?
To find matches, compare lists using this tool and check the "Common" output. This displays all items that exist in both List A and List B — your matching entries.
How to find duplicates in two lists?
The "Common" output in this list comparison tool shows items appearing in both lists. Enable "Remove Duplicates" to also eliminate duplicates within each list.
Is my data safe?
Yes! When you compare two lists here, all processing happens locally in your browser. Your data is never uploaded — it stays completely private on your device.