Remove Duplicate Lines
Remove Duplicate Lines
Paste a list — emails, URLs, keywords, anything — and get a clean, deduplicated version back. Optionally sort or trim.
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How to use it
- Paste your list into the input.
- Choose whether to ignore case or trim whitespace when comparing.
- Optionally sort the result or remove empty lines.
- Copy the deduplicated output.
Examples
Email list
Turn 500 pasted emails into a unique list, case-insensitive.
Keyword list
Merge SEO keyword exports without duplicates.
URL cleanup
Collapse a scraped list of URLs into unique entries.
About this tool
Deduplication keeps the first occurrence of each line and drops the rest. The comparison is configurable so subtle differences like case or trailing spaces can be ignored, without changing the text you keep in the output.
FAQ
- Does it preserve the original order?
- Yes by default. Duplicates after the first occurrence are dropped and the remaining lines keep their original position. Turn on 'Sort' to alphabetise the result instead.
- Can I ignore case when deduping?
- Yes. Tick 'Ignore case' and 'Apple' and 'apple' will collapse to a single entry (the first one seen).
- Can I ignore leading/trailing whitespace?
- Yes. 'Trim' strips whitespace when comparing, so ' foo' and 'foo ' count as duplicates. It doesn't trim the actual output unless you also enable 'Trim output'.
- What happens to blank lines?
- By default they're kept and counted like any other line. Enable 'Remove empty lines' to drop them entirely.
- Is the input uploaded?
- No. All processing runs locally in your browser.
Privacy
Everything runs locally in your browser. Your input is never uploaded, logged, or stored.