Remove Duplicate Lines
Merged logs, concatenated lists and copy-pasted notes often contain the same line many times. The Remove Duplicate Lines tool drops every repeated line while keeping the first occurrence and the original order, so deduplicating never scrambles your data.
- First occurrence wins
- Original order preserved
- Blank-line runs collapse to one
Overview
Everything runs in your browser — your text is never uploaded.
How to use this tool
- 1Paste the text containing repeated lines.
- 2Duplicates disappear automatically, first occurrence kept.
- 3Copy the deduplicated result.
Examples
Repeated list
apple banana apple cherry banana
Result
apple banana cherry
Log noise
ERROR: timeout ERROR: timeout OK
Result
ERROR: timeout OK
Limitations
- Comparison is exact and case-sensitive: "Apple" and "apple" count as different lines.
- Whitespace matters — a trailing space makes a line unique. Run Remove Extra Spaces first if unsure.
Frequently Asked Questions
Which duplicate is kept?
The first one; every later identical line is removed, so your ordering never changes.
Is matching case-sensitive?
Yes — lines must match exactly, including whitespace and capitalization.
What happens to blank lines?
Repeated blank lines collapse to a single blank line, keeping one separation where you had one.