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 Offline✅ Common(Intersection)
➖ Only in A(Difference)
➕ Only in B(Added)
Online List Comparison Tool - Free List Diff Checker
List 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.
Why choose List Diff Checker
- Side-by-side comparison: Enter List A and List B in two text areas
- Auto-categorization: Results organized into Common, Only in A, Only in B
- Smart options: Ignore case, trim whitespace for accurate comparison
- One-click swap: Quickly swap the two lists
- Export results: Download as text file or copy to clipboard
FAQ
What formats does the list comparison tool support?
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.
Can I compare large lists?
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.
What do Ignore Case and Trim Whitespace options do?
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.
Is my data uploaded to a server?
No. All comparison operations are performed locally in the browser. Your data never leaves your device.
Can I export the comparison results?
Yes. Click "Export" to download a TXT file, or click "Copy Results" to copy the results to your clipboard.