Remove Duplicate Lines
Delete duplicate lines and optionally sort.
Your files stay on your device
This tool processes everything locally in your browser. Nothing is uploaded to a server.
📝 About Remove Duplicate Lines
Remove Duplicate Lines deletes repeated lines from a block of text while keeping the first occurrence of each line in its original position. After processing, the tool shows how many lines remain, so you can see at a glance how much was removed. A separate Sort lines button arranges the lines alphabetically, and an Ignore case option treats “Apple” and “apple” as the same line for both deduplication and sorting.
This is useful for cleaning email or customer lists, merging keyword lists from several sources, removing repeated entries from log output, or preparing unique values before pasting them into a spreadsheet. Sorting afterward makes the result easier to scan and compare with another list.
Lines are compared exactly as written, so a line with a trailing space is not considered identical to one without it. If your data came from different sources, run it through the Remove Spaces tool first to trim each line. Multiple blank lines are also reduced to a single blank line. All processing happens in your browser, so even large private lists are not uploaded anywhere.
📘 How to use
- 1
Paste your list
Paste text with one item per line into the input box.
- 2
Remove duplicates
Tick Ignore case if needed, then click Remove duplicates and optionally Sort lines.
- 3
Copy the result
Check the remaining line count and copy the cleaned list.
❓ FAQ
Which copy of a duplicate line is kept?
The first occurrence is kept in its original position, and later repeats are removed. With Ignore case on, the first version’s capitalization is kept.
Why weren’t some duplicates removed?
Lines must match exactly, including spaces. Trim each line with the Remove Spaces tool first, or turn on Ignore case if only capitalization differs.
Does sorting happen automatically?
No. Removing duplicates keeps the original order; press Sort lines separately if you want alphabetical order.