All Tools VerseMerge Lists
Merge two lists by concatenating, interleaving, or taking their union with duplicates removed.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Processed locally in your browser. Your text never leaves this tab.
How to Use Merge Lists
- Paste your two lists. One item per line in List A and List B.
- Choose a mode. Concatenate puts B after A, Interleave alternates them, and Union combines them and drops duplicates.
- Merge them. The two lists are combined into one according to the mode you picked.
- Copy the result. Click Copy result. It all runs in your browser.
Frequently Asked Questions
What are the three modes?
Concatenate places list B straight after list A; Interleave alternates one item from each; Union combines both and keeps only the first copy of each item.
How does Union decide what is a duplicate?
Items must match character for character. The first time an item appears it is kept, and later exact copies are dropped.
Does Union keep the order?
Yes. Items appear in the order they are first seen across list A then list B.
How is this different from interleaving two lists?
The dedicated interleave tool only alternates. Merge adds concatenate and union options as well, in one place.
Are my lists uploaded?
No. The merge runs in your browser and your lists never leave the tab.
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