Why remove duplicate lines?
Duplicate lines appear frequently when merging datasets, combining log files, deduplicating word lists, or cleaning up exported data. Removing them by hand in an editor is tedious and error-prone — especially in large files. ServoDev's duplicate remover processes text instantly in the browser, with control over which occurrence to keep (first or last), whether the comparison ignores capitalisation, and whether blank lines should be stripped at the same time.
How to use this tool
- 1 Paste your lines into the Input panel.
- 2 Choose Keep first to keep the first occurrence of each duplicate, or Keep last to keep the final occurrence.
- 3 Toggle Case-insensitive if "Apple" and "apple" should count as duplicates. Toggle Trim whitespace to ignore leading/trailing spaces when comparing. Toggle Remove blank lines to strip empty lines as well.
- 4 The Output panel shows the deduplicated result with a count of lines removed.
Frequently asked questions
What is the difference between Keep first and Keep last?
Keep first retains the first occurrence of each line and discards all later duplicates — preserving the original order of first appearances. Keep last scans in reverse, keeping the final occurrence, which effectively gives you the last update when lines represent versioned entries.
Does it compare entire lines or individual words?
It compares entire lines (optionally trimmed of whitespace). Two lines are considered duplicates only if their full content matches — not if they share a word.
Does Trim whitespace affect the output?
Yes — when Trim whitespace is checked, the output lines are also trimmed, not just compared that way. If you want to compare trimmed but keep original spacing, uncheck the option.
Can I remove duplicate words instead of lines?
Not directly — this tool operates on lines. To deduplicate words, first put each word on its own line (e.g. by replacing spaces with newlines in Find & Replace), deduplicate, then join them back.
Is my text sent anywhere?
No. Everything runs locally in your browser.