Remove Duplicate Lines: Deduplicate Lists & Text Online
Filter out identical lines from text lists while preserving the first appearance order. Supports case-sensitive or case-insensitive matching in your browser.
Drop file here or click to upload (up to 5 MB)
Total Lines: 9
Non-Empty Lines: 9
Empty Blank Lines: 0
How to Use Remove Duplicate Lines
- Paste your lines of text, email lists, or code items into the editor.
- Toggle case-sensitivity if needed, then click "Deduplicate Lines" to eliminate duplicates.
- Download the cleaned list or copy it directly to your clipboard.
Practical Examples
Eliminating Duplicate List Items
Cleans up duplicate email lists, database IDs, or word entries.
Input:
banana apple banana
Output:
banana apple
Common Mistakes & Troubleshooting
- Ignoring hidden whitespace: a line with "apple " is different from "apple" unless extra spaces are trimmed first.
- Numeric sorting vs alphabetical: "10" comes before "2" in alphabetical sorting. Select "Numeric (0-9)" to sort numbers correctly.
Frequently Asked Questions
Does removing duplicate lines preserve the original line order?
Yes! FormatFlow retains the very first occurrence of each unique line and preserves its original position in the list.
Are empty lines counted in total lines?
Yes. FormatFlow shows both total lines and non-empty lines separately, allowing you to easily gauge whitespace.