Text Tools
Remove Duplicate Lines
Paste a list and remove every duplicate line in one click. Supports case-insensitive matching, optional blank line removal, and alphabetical sorting of the deduplicated result.
Each duplicate line after the first occurrence is removed.
Processed in your browser; your text is never uploaded
Features
- Removes exact duplicate lines keeping first occurrence
- Case-insensitive mode (treats 'Apple' and 'apple' as duplicates)
- Optionally removes blank lines from the output
- Optional alphabetical sort after deduplication
- Shows count of lines removed
- Copy or download the clean list
How to use it
- Paste your list into the input panel.
- Choose case sensitivity and blank line options.
- The deduplicated list appears instantly in the output.
- Copy the result or download as .txt.
Use cases
- Cleaning up email lists or URL lists with duplicates
- Deduplicating log file entries for analysis
- Removing repeated items from scraped data
- Consolidating keyword lists with overlapping entries
Limitations
- Case-insensitive matching is optional. First occurrence of each line is kept.
- Very large text blocks depend on browser memory.
- Processing happens entirely in the browser tab.
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Use toolFrequently asked
Which occurrence is kept when duplicates are removed?
The first occurrence is kept; all subsequent duplicates are removed. The original order is preserved.
Does it trim whitespace before comparing?
Yes. Leading and trailing whitespace is trimmed before comparison, so ' apple ' and 'apple' are treated as duplicates.