Remove duplicate lines
Clean an email list before a CRM import, deduplicate keywords, or tidy a list copied from a spreadsheet. Paste it in: duplicates, blank lines and stray spaces are removed as you type, and the result can be sorted, re-cased and rejoined with commas, ready to paste back.
Items in
6
Items out
4
Duplicates removed
2
Empty lines removed
1
Clean
Treats Sarah@ and sarah@ as the same item.
Removes leading, trailing and repeated spaces.
Order and case
Format
Order of operations
Every option is applied in the same fixed order: split the input, trim spaces, find and replace, change case, remove empty lines, remove duplicates, sort, add text before and after, then join.
The order matters for duplicates. Because trimming and case changes happen first, “Sarah@Example.com ” and “sarah@example.com” are recognised as the same item. The first occurrence is kept, in its original position unless a sort is chosen.
Questions
How do I remove duplicates from a list?
Paste the list with one item per line. Duplicates are removed immediately; turn on Ignore case to also remove items that differ only in capitalisation. Copy or download the result.
Which occurrence of a duplicate is kept?
The first one. The list keeps its original order unless a sort option is selected.
Can I convert a column into a comma-separated list?
Yes. Keep Split input on Lines and set Join output with to Comma and space. To go the other way, split on Commas and join with New lines.
Is there a size limit?
No server limit, because the list is processed in your browser. Lists of several hundred thousand lines process in under a second on a typical laptop.
Is my list uploaded?
No. Customer emails and other lists never leave your device.
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