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Remove Duplicate Lines

Deduplicate keyword lists, IDs, URLs, logs and exports while choosing exactly how matching should work.

TOOLMERA / TEXT
Remove Duplicate Lines
Browser-first processing
Input lines0
Unique lines0
Removed0
Privacy-mindedBrowser-first whenever possible
Instant workflowNo setup or account required
Free core toolOpen it and get the task done
WHY TOOLMERA

Built to get the task done.

  • Preserve first occurrence
  • Case & whitespace controls
  • Optional sorting
ABOUT THIS TOOL

Remove Duplicate Lines Online — Free, Private Dedupe Tool

Remove repeated lines from lists with case sensitivity, whitespace trimming, blank-line controls and optional sorting.

Define what counts as a duplicate

Case-insensitive mode can treat Apple and apple as the same line, while trimming can ignore accidental leading or trailing spaces.

Toolmera keeps the first surviving occurrence and preserves input order unless you explicitly choose a sort order.

Useful for list cleanup before import

Duplicate rows can distort keyword lists, CRM imports, allowlists, test data and simple line-based exports.

Removing duplicates before the next workflow makes counts and downstream processing easier to reason about.

HOW IT WORKS

How to use Remove Duplicate Lines

01

Paste one item per line

Add the list, IDs, URLs, keywords or other line-based text you want to clean.

02

Choose matching rules

Set case sensitivity, whitespace trimming, blank-line behavior and optional sorting.

03

Copy the unique list

Review how many lines were removed and copy the deduplicated output.

KEEP GOING

Related tools

Useful next steps in the same workflow.

FAQ

Common questions

Does it preserve the original order?

Yes, when Order is set to Preserve input order.

Can Apple and apple be treated as duplicates?

Yes. Turn on Ignore case.

Can blank lines be removed?

Yes. Blank-line removal is an explicit option.

Is the text uploaded?

No. Deduplication runs in the browser.