About this Remove Duplicate Lines
Remove Duplicate Lines cleans lists without requiring spreadsheet formulas or manual scanning. It keeps the first copy of each line and removes later repeats, which is handy for keyword lists, IDs, labels and other line-based text.
Formula or method
Each trimmed line is compared with lines already seen; later duplicates are removed.
Example
A list with apple, banana, apple becomes apple, banana.
Common uses
- Clean repeated keywords or tags.
- Deduplicate copied rows before importing them elsewhere.
- Reduce repeated IDs, names or simple text entries.
How to use this tool
- Enter the values or text requested by the calculator.
- Choose units or options when the tool provides them.
- Select the calculation button and review the result.
- Use the formula, example and notes on this page to check whether the result fits your situation.
Important note
Leading and trailing spaces are ignored when deciding whether two lines are duplicates.
Frequently asked questions
Does it sort the lines?
No. It preserves the original order and keeps the first occurrence of each unique line.
Are uppercase and lowercase treated as the same?
No. The current tool treats different letter case as different text.