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Paste a list with one item per line: emails, keywords, URLs, product codes, names. Duplicates go, keeping the first time each one appears, and you can ignore case, trim stray spaces, drop empty lines and sort the result, with numbers in natural order so 2 comes before 10.
paste here
result
Free to embed. Put this remove duplicate lines on your blog, docs or class page.
| Option | Before | After |
|---|---|---|
| Remove duplicates | a, b, a | a, b |
| Ignore case | Ada, ada | Ada |
| Trim spaces | ' ada ' | 'ada' |
| Remove empty lines | a, (blank), b | a, b |
| Sort A→Z (natural) | item10, item2 | item2, item10 |
sort -u list.txt sorts and removes duplicates. To keep the original order, use awk '!seen[$0]++' list.txt. Add -f to sort to ignore case.
The first one. Every later line that matches an earlier one is removed, so the list keeps its original order unless you sort it.
It treats Apple, apple and APPLE as the same line. That's what you want for emails and domains, which aren't case-sensitive.
In Excel, select the column and choose Data › Remove Duplicates. In Google Sheets, choose Data › Data cleanup › Remove duplicates, or use =UNIQUE(A:A). Pasting the column here is quicker when you just need the list.
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