Remove Duplicate Lines
Remove duplicate lines from your text while preserving the original order. Perfect for cleaning up lists, email addresses, bibliography entries, and data exports.
Options
Frequently Asked Questions
- Does removing duplicate lines preserve the original order?
- Yes. This tool uses a first-occurrence approach: the first time a line appears it is kept; all subsequent identical lines are removed. The remaining lines appear in the same order as they did in the original text.
- Is the comparison case-sensitive?
- By default, the comparison is case-sensitive, so "Apple" and "apple" are treated as different lines. You can enable case-insensitive mode to treat them as duplicates and remove both, keeping only the first occurrence.
- Can I remove blank lines at the same time?
- Yes. The tool has an option to strip blank lines along with duplicates. This is useful when cleaning up lists or reference data that may have empty lines scattered throughout.
- What can I use this tool for?
- Common uses include deduplicating email lists, cleaning up bibliography entries, removing repeated items from keyword lists, processing CSV data, and cleaning any line-based text where repeated entries are unwanted.