Remove Duplicate Lines

Free Remove Duplicate Lines Tool — Clean Any List Instantly

Duplicate lines in text files, keyword lists, email lists, and code are a common problem. Manually scanning for and removing duplicates is tedious and error-prone, especially in large lists. This free Remove Duplicate Lines tool processes any block of text instantly — removing all repeated lines with options for case-insensitive matching, trimming whitespace, and sorting the output.

Paste any text with duplicate lines, configure your options, and click Remove Duplicates. The result is a clean list of unique lines ready to copy. The tool also shows how many duplicates were removed.

Common use cases: cleaning keyword lists for SEO campaigns, deduplicating email subscriber lists before import, removing repeated entries from log files, and ensuring code variable or identifier lists contain no duplicates.

Deduplication Options

Case-insensitive matching. Treats lines as duplicates regardless of uppercase or lowercase. "keyword" and "Keyword" are the same line.

Trim whitespace. Removes leading and trailing spaces from each line before comparison, so " keyword " matches "keyword".

Sort output. Sorts the remaining unique lines alphabetically after deduplication for easier review.

Count duplicates. Shows a count of how many duplicate lines were found and removed, giving you insight into how much redundancy was in the original text.

Related Tools

• Word Counter – Count lines, words and characters in text.
• Text Case Converter – Normalize case before deduplication.
• Comma Separator – Convert lines to comma-separated values.

Frequently Asked Questions