Find Unique Lines
Extract lines that appear exactly once
By Craftisle Team
About Find Unique Lines — Free Online Tool
How to Use Find Unique Lines — Step by Step
- Paste your text
Type or paste text with multiple lines.
- Choose options
Enable 'Case-sensitive comparison' to treat 'Apple' and 'apple' as different. Enable 'Count only' to see the number of unique lines without listing them.
- Find Unique
Click Find Unique. Unique lines (or count) appear in output.
Use Cases for Find Unique Lines
Data analysis
Find unique entries in datasets, logs, or survey responses.
List cleaning
Extract unique items from a list that has duplicates.
Debugging
Find unique error messages or log entries that appear only once.
FAQ — Find Unique Lines Free Online Tool
What does 'appear exactly once' mean?
A line is 'unique' if it appears exactly one time in the input. Lines that appear 2+ times are excluded.
How is this different from 'Remove Duplicates'?
'Remove Duplicates' keeps one copy of each line. 'Find Unique' only keeps lines that have NO duplicates.
Does it preserve original order?
Yes. Unique lines are returned in the order they first appeared in the input.