Free Remove Duplicate Lines
Paste a list and remove duplicate lines (optionally ignoring case) and empty lines — handy for cleaning up emails, keywords or any line-by-line list.
What is the remove duplicate lines?
A remove duplicate lines tool is a free utility that deletes repeated lines from a list so each entry appears only once. You paste a list — emails, keywords, URLs or any line-by-line data — and it keeps the first occurrence of every line and removes the rest. Slashit's tool runs in your browser, so your list stays private, and it can optionally ignore case when comparing lines or strip out empty lines at the same time. It's a fast way to de-duplicate and tidy a list without a spreadsheet.
How our free remove duplicate lines works
Paste your list
Add a list with one item per line — email addresses, keywords, URLs or any repeated data.
Remove the duplicates
Keep the first of each line and drop the rest. Optionally ignore case, or remove empty lines too.
Copy the clean list
The de-duplicated list appears instantly — copy it and use it wherever you need a clean set.
Who uses our free remove duplicate lines?
Marketers & SEO teams
De-duplicate keyword and URL lists so reports and campaigns don't double-count entries.
Data & ops teams
Clean exported lists of emails, IDs or records before importing them somewhere else.
Anyone with a list
Tidy any line-by-line list without opening a spreadsheet or writing a formula.
Why use the remove duplicate lines?
Instant de-duplication
Remove every repeat in one click while keeping the original order of the first occurrences.
Case-insensitive option
Treat lines that differ only in capitalisation as duplicates when you need to.
Free and private
No sign-up, and your list never leaves your browser.
Frequently asked questions
Does it keep the original order?
Yes. It keeps the first time each line appears and removes later duplicates, so the remaining lines stay in their original order.
Can it ignore capitalisation?
Yes. Turn on the ignore-case option to treat lines that differ only in letter case as duplicates.
Is it free?
Yes — it's free, needs no sign-up, and runs entirely in your browser.
