Remove Duplicate Lines
Strip repeated lines from a list while keeping the first occurrence.Text ToolsRemove duplicate lines
Keep the first occurrence of each line and drop the repeats.
About this tool
Cleaning up an exported list should not require a spreadsheet. This tool keeps the first occurrence of each line, reports how many were removed, and lets you decide whether case and surrounding whitespace matter.
How to use the Remove Duplicate Lines tool
- Paste your lines. Put one item per line in the input area.
- Set the options. Optionally ignore case, trim surrounding whitespace, or tick Keep blank lines to retain empty lines.
- Copy the result. The deduplicated list appears immediately with a count of removed lines.
Supported formats
Input
- Plain text, one item per line
Output
- Deduplicated lines
- Count of removed lines
Inputs are validated before anything is processed. Invalid values and unsupported files are rejected with a clear error instead of failing silently.
Frequently asked questions
Which occurrence is kept?
The first occurrence keeps its original position and text; later duplicates are dropped.
Can I sort at the same time?
Sorting is deliberately separate so the original order is preserved. Use the output in any editor if you also need it sorted.
How are blank lines handled?
Blank lines are dropped by default. Tick Keep blank lines to retain them.
Is there a line limit?
The whole list is held in browser memory, so very large inputs depend on your device.
Privacy
Everything you enter stays in this browser tab. There is no upload endpoint for tool inputs, no account, and no server-side copy of your text or files. Results are produced locally and disappear when you close the page.
No account is required and no file is ever uploaded. See the privacy policy for details about analytics and the limited data this site stores.
Known limitations
- Matching is exact (with the optional case and trim toggles); fuzzy or near-duplicate detection is not offered.
- The original order is always preserved; sorting is not part of this tool.
- Very large lists are limited by the memory available to the browser tab.
Related tools
Other free tools from the same collection.