What Is Remove Duplicate Lines?
A free online duplicate line remover. Remove duplicate lines, find only duplicates, or keep unique lines from any text. Toggle case sensitivity and line trimming. Shows statistics on lines removed.
Why Use Remove Duplicate Lines?
- Three modes: remove, keep unique, find duplicates
- Case-sensitive option
- Trim lines before processing
- Statistics: input, output, and removed line counts
How to Use Remove Duplicate Lines — Step by Step
1
Paste your text with duplicate lines.
2
Choose mode: Remove Duplicates, Keep Unique, or Find Duplicates.
3
Toggle case-sensitive and trim options.
4
Copy or download the result.
Who Is Remove Duplicate Lines Best For?
- data cleaning
- list deduplication
- CSV processing
- log analysis
Remove Duplicate Lines — Frequently Asked Questions
What is the difference between Remove and Keep Unique?
"Remove Duplicates" keeps the first occurrence and removes subsequent duplicates. "Keep Unique" keeps only lines that appear exactly once, removing both duplicates and their originals.
Does it preserve line order?
Yes, the original order of lines is preserved when removing duplicates. Only subsequent duplicate occurrences are removed.
Ready to Use Remove Duplicate Lines?
Free online tool — works in your browser, no sign-up required. Start using it right now.
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