Remove Duplicate Lines
Remove repeated lines and keep unique lines in your text with one click.
What is Remove Duplicate Lines?
Remove Duplicate Lines is a free online tool that deduplicates text by keeping only the first occurrence of each line. It is ideal for cleaning up lists of URLs, email addresses, keywords, or any line-based data with unwanted repetitions.
How to use
- Paste your text (one item per line) into the input box.
- Click Remove Duplicates. Only unique lines are kept.
- Copy the result to your clipboard with the Copy button.
Notes
- Comparison is case-sensitive: "Apple" and "apple" are treated as different lines.
- Empty lines are also deduplicated Emultiple blank lines become one.
- The order of the remaining lines is preserved from the original input.
FAQ
- Does it remove leading/trailing spaces before comparing?
- No Elines are compared exactly as-is, including surrounding whitespace. Trim your lines first if you want whitespace-insensitive deduplication.
- Can I use this to clean a list of email addresses?
- Yes. Paste one email per line and click Remove Duplicates. The result will contain only unique addresses. Note that comparison is case-sensitive, so normalize case first if needed.
- Is there a line limit?
- There is no enforced limit. The tool handles thousands of lines without issue on modern browsers.
Overview
Remove repeated lines from text lists while keeping unique entries. Useful for logs, keyword lists, and CSV-like one-item-per-line cleanup.
How to use
- Paste lines into the input.
- Run duplicate removal.
- Copy the cleaned output.
Examples
-
Keyword list
Input: apple\napple\nbanana
Output: apple\nbanana
-
Log cleanup
Input: INFO A\nINFO A\nINFO B
Output: INFO A\nINFO B
Notes
- Leading/trailing spaces can make lines appear different.
- Case sensitivity affects duplicates.
- Validate output when order matters.
FAQ
- Is the original order preserved?
- Yes, first-seen order is retained.
- Are empty lines removed?
- Depends on input; check output if blank lines are meaningful.
- Can I process thousands of lines?
- Yes for typical browser limits, but very large inputs may slow down.
Embed this tool
Paste this iframe into any HTML page to embed Remove Duplicate Lines on your site:
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