How does list duplicate work?

Enter your list items, set the number of copies, and choose concatenate (append copies) or interweave (alternate original with copies) mode.

What is concatenate mode?

Appends all copies after the original list: [A,B] × 3 = [A,B,A,B,A,B].

Alternates original items with copies: [A,B] × 2 = [A,A,B,B].

Yes. All processing happens locally in your browser. No data is sent to any server.

Duplicate list items with concatenate or interweave modes. Supports custom copies and separators. Runs entirely in your browser.

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