Free Duplicate Line Remover
Remove duplicate lines from lists, keywords, URLs, CSV columns, and pasted text.
Use this duplicate line remover to turn messy lists into unique lines without changing their order. It is built for keyword exports, URL lists, CSV columns, spreadsheet rows, content briefs, and any pasted text where repeated lines slow you down.
- ✓ Keep first occurrences in order
- ✓ Remove duplicate keywords and URLs
- ✓ Ignore case when matching
- ✓ Trim spaces before comparing
- ✓ Remove blank lines
- ✓ Browser-only processing
Paste lines to remove duplicates.
How to Remove Duplicate Lines
- Paste your list into the text box.
- Choose matching options for whitespace, letter case, and blank lines.
- Review the deduplicated output and the line count summary.
- Copy the unique lines back into your spreadsheet, CMS, or brief.
Common Uses
- SEO keyword cleanup — remove repeated keyword ideas before clustering or briefing content.
- URL audits — deduplicate crawl exports, redirect lists, or sitemap samples.
- Newsletter and lead lists — clean pasted rows before importing them into another tool.
- Research notes — keep the first version of repeated bullet points or copied snippets.
Related guides
Frequently Asked Questions
- What does a duplicate line remover do?
- It scans line-by-line text and keeps only the first occurrence of each matching line. This is useful for keyword lists, URL lists, exported CSV columns, and research notes.
- Can it ignore uppercase and lowercase differences?
- Yes. Turn on ignore case to treat "Keyword", "keyword", and "KEYWORD" as the same line.
- Can it remove blank lines too?
- Yes. The blank line option removes empty lines while deduplicating the rest of the list.
- Does the tool sort my lines?
- No. It preserves the order of first occurrences so your list stays in the same sequence.
- Is my list private?
- Yes. The deduplication happens in your browser and your text is not uploaded.