Remove Duplicate Lines Online

Common uses

• Deduplicate keyword, URL or email lists.
• Clean repeated log lines or exported values.
• Remove duplicate entries before importing a list into another tool.
• Combine copied lists while preserving the original order.

Remove duplicate lines online from text and lists

Use this duplicate line remover online to clean a pasted list without changing the order of its first occurrences. It is useful for keyword research, URL lists, product or inventory exports, email lists, copied notes and text logs where the same entry appears more than once.

Paste one item per line, choose how matching should work, and select whether to keep the first or last occurrence. Turn on Ignore case to treat values such as Apple and apple as a match. Turn on Trim whitespace to compare lines after removing leading and trailing spaces, or remove blank lines before copying the cleaned result.

• Preserve the original order: Keep first retains the earliest matching line and its position.
• Keep the latest version: Keep last retains the final occurrence of each matching line.
• Sort when needed: A–Z sorting is optional and happens after duplicates are removed.
• Review before reuse: Check the output before importing or publishing a cleaned list.

The tool processes text in your browser; it does not need to upload your pasted list to a server. Matching options affect how lines are compared, while the selected source line is kept in its original form.

How it works

Each newline-separated entry is compared using your selected rules. By default, the first occurrence is retained and later matches are removed. The original source text is not rewritten just because whitespace or case-insensitive comparison is enabled. Matching compares whole lines; it does not remove a line just because it contains another line as a substring.

Example: remove duplicate lines from a list

With Ignore case and Trim whitespace enabled, these entries are treated as duplicates even though their capitalization or outside spaces differ:

Apple
banana
 Apple
BANANA
Cherry

Keep first produces:

Apple
banana
Cherry

Choose Keep last to retain the final source occurrence instead. Turn on Sort result A–Z only when you want the unique output sorted rather than kept in source order.

FAQ