Remove Duplicate Lines
Deduplicate lines while keeping order and counting repeats.
How to use this tool
- Paste your list (one line per entry).
- Choose case sensitivity and trim option.
- Copy the deduplicated output or view the count report.
How it works
Lines stream through a Set (first occurrence wins), building a frequency map for the report.
Tips
- Whitespace differences create 'duplicates' — enable trimming first.
- Use the report to spot accidental double-pastes.
Limitations
Near-duplicates differing by a character are treated as distinct.
Frequently asked questions
Does it keep original order?
Yes — the first occurrence of each unique line is preserved in its original position.
Can I see how many times each line repeats?
Yes — a count report lists each unique line with its total occurrences.
Is matching case-sensitive?
Toggleable — case-insensitive merging treats 'Hello' and 'hello' as the same.