How do I remove duplicate lines from a text file?+
Paste your text into the tool and click 'Remove Duplicates'. Case-insensitive mode treats 'Apple' and 'apple' as the same. Trim whitespace ensures 'apple ' and 'apple' match.
Can I deduplicate a list of email addresses?+
Yes. Paste your email list one per line. Enable case-insensitive matching since email addresses are technically case-insensitive. The output is a clean unique email list.
How do I deduplicate and sort a keyword list?+
Enable both 'Remove Duplicates' and 'Sort Output'. Case-insensitive mode merges 'seo tool' and 'SEO Tool'. The result is an alphabetically sorted unique keyword list.
What is the fastest way to deduplicate in Excel?+
Select your column, then Data, then Remove Duplicates. In Google Sheets use =UNIQUE(A1:A100). For large datasets on the command line, use sort -u filename.txt on Linux/Mac. This online tool works without any software.