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ToolPika

Remove Duplicate Lines

Paste a list with one item per line. Repeated lines are removed as you type, and you can copy or download the clean list.

Runs in your browser. Nothing you enter is sent to a server.

How it works

The tool reads your text line by line and remembers every line it has seen. When a line appears again, it is dropped. The result keeps the first occurrence of each line in its original order, and the counter shows how many lines were removed and how many remain.

Options change what counts as “the same line”:

Option Example treated as duplicates
Case sensitive off Madrid and madrid
Ignore spaces at the ends Madrid and Madrid
Remove empty lines All blank lines, not just repeated ones

Sorting uses natural order, so item 2 comes before item 10, and ignores case when case sensitivity is off.

Common uses

  • Email lists merged from several sources.
  • Keywords, tags or product codes copied from different files.
  • Log files, to see each distinct message once.
  • Spreadsheet columns: paste a column, remove duplicates and paste it back.

Frequently asked questions

Which copy of a duplicate is kept?

The first one, in its original position. Later repeats are removed, so the order of your list does not change unless you choose to sort it.

Are "Apple" and "apple" duplicates?

Only if you untick "Case sensitive". With it unticked, lines that differ only in capital letters count as the same, and the first spelling is kept.

What does "Ignore spaces at the start and end" do?

It treats "apple" and " apple " as the same line, which is common when copying from spreadsheets or documents. The kept line is shown without those extra spaces.

Is my list uploaded?

No. Everything happens in your browser, so it is safe for email lists, customer names and other private data.

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