Find Repeating List Items (Duplicate Detector)
Detect duplicate and repeated elements with occurrence frequencies and counts.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use Find Repeating List Items (Duplicate Detector)
Enter your list of items.
View repeated elements ranked by frequency.
Copy duplicate items.
Frequently Asked Questions
Does it show how many times an item repeats?
Yes, occurrence counts like 'apple (3x)' are shown by default.
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