Remove Duplicate Lines
Remove repeated lines, keeping the first or last occurrence, with an optional case-insensitive match.
Remove Duplicate Lines
Remove repeated lines, keeping the first or last occurrence, with an optional case-insensitive match.
About this remove duplicate lines
This tool removes repeated lines from a block of text while keeping the first time each line appears, so the surviving order matches your original. Paste a list and it returns a de-duplicated version ready to copy back out.
It is built for the messy lists that pile up from copying and merging sources: email addresses, keywords, product codes, URLs, or log lines where the same entry recurs. Removing repeats by hand is slow and error-prone; doing it in one pass keeps the list clean and the sequence intact.
Common uses
- Clean a list of emails, keywords, or URLs that contains repeated entries.
- De-duplicate rows copied and merged from several sources.
- Tidy a log or export where the same line appears many times.
Helpful tips
- By default the first occurrence of each line is kept; switch to keep-last if you prefer the final copy.
- Surrounding spaces are ignored automatically, and an option can match lines case-insensitively.
- Run the text sorter afterwards if you also want the unique list alphabetised.
How to use Remove Duplicate Lines
- Paste, type, or upload the text you want to process with Remove Duplicate Lines.
- Check line breaks, spacing, encoding, punctuation, and hidden formatting before running the tool.
- Choose the mode that matches your target output, such as cleanup, conversion, counting, previewing, reading, or ebook export.
- Review the processed text before copying, downloading, importing, or publishing it.
- Keep the original text when the content is important, especially before bulk cleanup or format conversion.
Frequently asked questions
Does it keep the original order of lines?
Yes. It keeps the first appearance of each line (or the last, if you choose keep-last) and removes the repeats, so the remaining order follows the input.
What counts as a duplicate?
Leading and trailing spaces are ignored, so lines that differ only by surrounding whitespace are treated as the same. Turn on the case-insensitive option to also match lines that differ only by capitalisation. Blank lines are dropped.
Is Remove Duplicate Lines free, and does it work on mobile?
Yes. Remove Duplicate Lines is free to use on JustBloc with no account or installation, and the page is designed to work on desktop, tablet, and mobile browsers.