Remove Duplicate Lines
Remove duplicate lines or words from a list with trim and sort options.
How to use Remove Duplicate Lines
Three quick steps — no sign-up needed
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Step 1
Paste your list
Drop in lines or words that may contain repeats.
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Step 2
Choose split and options
Split by Lines or Words, then optionally trim whitespace, remove empty entries, ignore case, or sort A→Z.
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Step 3
Copy unique results
Use the cleaned list in spreadsheets, tag lists, or code.
About Remove Duplicate Lines
Remove Duplicate Lines deduplicates pasted lists by line or by word, with optional trim, empty removal, case-insensitive matching, and A→Z sort. Analysts searching "remove duplicate lines online", "dedupe text", or "unique lines tool" need clean lists without spreadsheet formulas.
Paste text, pick Lines or Words, set options (Trim whitespace, Remove empty, Case-insensitive, Sort A→Z), and copy the result. Case-insensitive mode treats "Apple" and "apple" as the same item when enabled.
Order may change when sorting is on. If you must keep first-seen order, leave sort off and only dedupe.
Benefits of Remove Duplicate Lines
Frequently asked questions
Does it keep the first occurrence?
Typical dedupe keeps one copy; enable sort only if order does not matter.
What is case-insensitive?
Upper and lower case versions count as duplicates when enabled.
Can it dedupe CSV columns?
Paste the column values; complex CSV structure may need a spreadsheet.
Will blank lines disappear?
Yes if you enable Remove empty.
Is word mode splitting on spaces?
Words are split from the text - punctuation may stay attached unless you clean first.