Remove Duplicate Lines
Remove repeated lines while keeping the order of first occurrence. Comparisons are exact and case-sensitive; spaces are significant, and one empty line is retained.
How to use Remove Duplicate Lines
- Enter or paste “One entry per line”. Follow the separators and formatting described in the tool introduction.
- Select Calculate or Process. Review the result and any validation message before copying or downloading available output. Reset clears the result and restores the starting inputs.
Method & assumptions
Normalize CRLF/CR to LF; preserve the first occurrence of each exact line using a set.
Worked example
apple, pear, apple becomes apple, pear on separate lines; Apple remains distinct.
Results and projections are informational estimates, not financial, medical, legal, tax, or property advice. Check assumptions, units, rounding, and local requirements independently. Investment illustrations do not guarantee returns. Keep original files and check transformed output before use.
Questions, answered
Are lines trimmed before comparison?
No. A line with a trailing space is different. Run the whitespace cleaner first only if those differences should be discarded.
Does this send my input to a server?
No. This engine processes input locally without network requests. The surrounding website may have its own analytics or scripts; avoid entering sensitive material on an untrusted site. Text fields accept at most 1,000,000 UTF-16 units unless a smaller field limit is stated.