✅ Common（Intersection）
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➖ Only in A（Difference）
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➕ Only in B（Added）
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Free online list diff checker. Compare two lists and find common items, items only in A, and items only in B. Supports ignore case and trim whitespace. Pure frontend, private & secure. | No Signup, Client-Side · No Server Uploads
Zero Dependencies·Works OfflineList Diff Checker is a free online tool for comparing two lists and finding differences. Quickly identify common items, items only in list A, and items only in list B. Perfect for data analysis, content comparison, version diff checking, and inventory comparison. Pure frontend processing, no data upload.
Supports line-separated text lists. One item per line. Supports Chinese, English, numbers, symbols and any characters. Results are categorized into Common Items, Only in A, and Only in B.
Supports comparing lists with thousands of items. For very large lists (over 10,000 items), there may be performance impact since processing is done in the browser.
Ignore Case: treats "A" and "a" as the same during comparison. Trim Whitespace: automatically removes leading/trailing spaces from each line to avoid false mismatches due to formatting differences.
No. All comparison operations are performed locally in the browser. Your data never leaves your device.
Yes. Click "Export" to download a TXT file, or click "Copy Results" to copy the results to your clipboard.