Duplicate line remover

Remove repeated lines while preserving their first appearance. Choose whether case and outer spaces matter.

On your device · No account

Privacy details

Duplicate line remover processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Your text

Options

Match capitalization

Compare outer spaces

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using Duplicate line remover

Remove repeated lines while preserving their first appearance. Choose whether case and outer spaces matter.

Next: Sort words alphabetically

A worked example

The duplicate line remover changes "a\nb\na" becomes "a\nb".

Next: Add line numbers

Before you use the result

Matching is line-based. The output uses standard newlines and keeps one empty line if your list has blanks.

Next: Text to columns

Cite this page

Citation style

ToolOctopus. “Duplicate line remover.” Updated 2026-09-19. https://tooloctopus.com/duplicate-line-remover.

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