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Merge lists

Combine two lists into one, with optional deduplication and sorting.

Input
List B
Output
Related tools
Compare listsLists & combinationsCombine texts line by lineText manipulationRemove duplicate linesText cleaningSort linesText manipulation
Merge lists
Paste one list into each panel, one item per line, and get a single combined list back. It is the fastest way to fold two subscriber exports into one mailing list, pool keyword sets from two research sessions, join product codes from two suppliers, or stitch a backlog from two spreadsheets together without opening a spreadsheet at all.
Two merge modes cover the usual jobs. "Append B after A" puts the second list underneath the first and keeps both in their original order — the safe default when the lists are unrelated. "Alternate items" interleaves them A, B, A, B, which is what you want when the two lists are parallel, for example names and their matching codes destined for a round-robin rota. If one list is longer, its leftover items follow at the end rather than being dropped.
Removing duplicates is on by default: the first occurrence of a value wins and later copies disappear, so an item present in both lists appears once. Matching is exact, which means "Apple" and "apple " are two different items — run the case converter or a whitespace cleanup first if that matters to you. Sorting orders the finished list alphabetically and handles accented characters correctly. Dropping empty lines removes blank and whitespace-only rows before anything else happens, so a stray newline at the end of a paste cannot become an item.
Everything runs inside your browser and neither list is uploaded anywhere, which makes the tool safe for customer records or internal data. The tally under the output shows how many items each list held and how many survived the merge, updating live as you type.
FAQ
What happens when the two lists have different lengths?
Nothing is lost. In append mode the shorter list simply ends sooner; in alternate mode the pairs run out and the remaining items of the longer list follow at the end, in their original order.
Which duplicate is kept?
The first one. List A is processed before list B in append mode, so a value present in both keeps its position and spelling from A. In alternate mode the first occurrence in the interleaved sequence wins.
Does deduplication ignore capitalisation and extra spaces?
No — matching is exact, so "Apple", "apple" and "apple " count as three different items. Clean the lists with the case converter or the extra spaces remover first, or use compare lists, which has its own case-insensitive option.
In what order are the options applied?
Empty lines are dropped first, then the lists are merged, then duplicates are removed, and sorting happens last. That is why a sorted result is always deduplicated cleanly.
Are my lists uploaded anywhere?
No. The merge runs entirely in your browser and neither list ever leaves your device.