What is the Duplicate Line Remover?#
The Duplicate Line Remover removes repeated lines from pasted text. When the same line appears more than once, only the first occurrence stays and the rest are dropped. The order of the lines never changes.
It suits text with one item per line, such as lists of email addresses, URLs, or exported data. Options control how lines are compared and how blank lines are handled.
How to Use#
- Paste your text, one item per line, into the input box.
- Switch the options as needed.
- Check the unique and removed line counts, then copy the result.
What the Options Do#
- Ignore case: treats "Apple" and "apple" as the same line. Use it when casing does not matter, such as with email addresses or domain names.
- Trim spaces: removes leading and trailing spaces from each line before comparing. " apple " and "apple" count as the same line, and the result shows the trimmed form.
- Remove empty lines: drops blank lines and lines containing only whitespace from the result. Useful for cleaning up extra line breaks left over from copying.
Common Use Cases#
- Removing duplicate addresses from a newsletter recipient list.
- Merging keyword lists exported from different tools.
- Filtering repeated lines out of log files to see the distinct errors.
- Copying a spreadsheet column, removing duplicates, and pasting it back.
FAQ#
No. Each line keeps the position where it first appeared.
By default, yes. Turn on "Ignore case" to treat lines that differ only in capitalization as the same.
By default they are kept, but repeated blank lines collapse into one. Turn on "Remove empty lines" to drop them from the result.
No. Everything runs in your browser, and your text never leaves your device.
Notes#
- A line counts as a duplicate only when its text matches exactly, except for the differences the options are set to ignore. Full-width and half-width letters and digits are treated as different lines.
- The output always uses Unix line breaks (LF), even when the input contains Windows (CRLF) or old Mac (CR) line breaks.