Remove Duplicate Lines
Remove duplicate lines from text instantly. Keep unique lines only.
How it works
Paste your list
Enter or paste text with one item per line.
Remove duplicates
Click Process — lines are compared exactly, keeping only the first occurrence of each.
Copy the result
Copy the deduplicated list, in its original order.
Common use cases
Cleaning email lists
Strip repeated addresses before a mail merge or CSV import.
Merging keyword lists
Combine several keyword or tag exports into one unique list.
Deduplicating log lines
Cut repeated lines out of pasted log output to spot unique events.
Tidying spreadsheet columns
Paste a column of values here before pasting it back into a sheet.
Frequently asked questions
Does it keep the original order?
Yes. The first time a line appears, it stays in place; every later repeat of that exact line is removed.
Is comparison case-sensitive?
Yes — "Apple" and "apple" are treated as different lines. Lowercase both first if you need case-insensitive deduplication.
Does it trim extra spaces?
No. A trailing space makes a line count as different from an otherwise identical one. Run it through Remove Extra Spaces first if that matters.
Is my data stored?
No. Deduplication happens entirely in your browser — nothing is uploaded.
Share this tool
Related Tools
Markdown to HTML
Convert Markdown to HTML
MCP Tool Generator
Generate and validate MCP tool definitions for AI agents
Find and Replace
Find and replace text patterns
Word Counter
Count words, characters, and sentences
Count Words
Analyze text statistics and word count
Base64 to PDF
Convert Base64 strings to PDF files