Free utility tool · no sign-up
Free Remove Duplicate Lines Tool
Paste a list and instantly remove duplicate lines, keeping only unique entries. Great for cleaning up keyword lists, email lists, URLs and CSV columns. Optional trim, case-insensitive and alphabetical sort.
Clean up any list in seconds
Duplicate entries creep into every list — merged spreadsheets, scraped data, combined keyword exports, email sign-ups. This tool keeps the first occurrence of each unique line and removes the rest, so your list is clean and ready to use.
Use Ignore case so "Email@x.com" and "email@x.com" count as one, Trim spaces to catch entries that only differ by trailing whitespace, and Sort A–Z to alphabetize the result.
Great for SEO and data work
- Keyword lists — dedupe merged exports before clustering or analysis.
- URL lists — clean up crawl exports and redirect maps.
- Email lists — remove repeat addresses before importing.
- Any CSV column — paste a column and get the unique values.
Frequently asked questions
Does it keep the first or last duplicate?
It keeps the first occurrence of each line and removes any later repeats, preserving your original order unless you choose to sort A–Z.
What does "Ignore case" do?
It treats lines that differ only in capitalization as duplicates — so "Apple" and "apple" collapse into one entry.
Is there a size limit?
It handles large lists comfortably since it runs in your browser. Very large files (hundreds of thousands of lines) may be slower depending on your device.
Is it free and private?
Yes — free, no sign-up, and nothing leaves your browser.