Strip repeated lines out of any list, keeping the order you started with, right in your browser. Nothing you paste here is ever uploaded to Brekzy.
Duplicate line removal takes a block of text, one item per line, and strips out any line that already appeared earlier (or later, depending on which occurrence you choose to keep), so each distinct line shows up exactly once in the result. It's the same idea as deduplicating rows in a spreadsheet, except it works directly on plain text: paste in a list, a set of keywords, an export of URLs, or anything else broken into lines, and the tool compares every line against the ones it has already seen rather than requiring you to sort, scan, and delete by hand.
Case-sensitive comparison treats letters of different capitalization as different characters, so "Banana" and "banana" count as two separate lines. Case-insensitive comparison folds capitalization out of the comparison, so those same two lines are treated as duplicates of each other, and only the first one encountered survives in the result.
For example, given the input Apple, Banana, Apple, Orange, banana, Apple (one per line), case-sensitive comparison keeps Apple, Banana, Orange, banana, four lines, because "Banana" and "banana" differ by case and are considered distinct. Case-insensitive comparison instead keeps Apple, Banana, Orange, three lines, because "banana" is now recognized as a repeat of the already-seen "Banana" and gets removed, leaving only the first casing that appeared.
Keyword lists built up over several research sessions almost always end up with repeats, especially once you've merged suggestions from more than one source or pulled the same seed term through a few related searches. Email lists have the same problem after combining a few sign-up exports or a CRM download with a spreadsheet someone maintained by hand. Running either kind of list through this tool once, before you upload it somewhere or send a campaign, catches the repeats a quick visual scan would miss.
Scraped URLs, crawl exports, and log files tend to accumulate duplicates for structural reasons rather than sloppy data entry: the same page gets linked from several places, a crawler revisits a URL across sessions, or a log rotates and repeats a line during a retry. A spreadsheet export can do the same thing after a join or a re-run pulls in rows you already had. Deduplicating that kind of data before you analyze it or feed it into another tool keeps counts accurate and avoids processing the same row twice.
Yes. Paste your text into the box, choose how you want duplicates matched and handled, and click "Remove Duplicates." The tool rebuilds your list with every repeated line collapsed down to one.
Yes, by default. Surviving lines stay in their original relative order rather than getting shuffled or sorted. If you switch to "Keep last occurrence," a line that appears more than once will show up at the position of its LAST occurrence instead of its first, since that's the copy being kept, but every other line's order is untouched. Sorting only ever happens if you turn on the "Sort after removing duplicates" option yourself.
Yes. Switch the comparison setting to "Case-insensitive" and lines that differ only by capitalization, like "Newsletter" and "newsletter," are treated as duplicates of each other, with only the first-seen casing kept in the result.
Yes. The "Empty lines" option removes blank lines from the result by default. Switch it to "Keep empty lines" if you want to preserve the spacing structure of your original text instead.
No. Everything runs locally in your browser using JavaScript. Your text is never sent to Brekzy, never logged, and never stored, whether you close the tab right away or leave it open all day.
Yes. This tool has been tested against several thousand lines at once, including long keyword and URL exports, and processes them in a fraction of a second since the entire comparison happens in memory in your browser rather than over a network request.
By default, leading and trailing spaces are trimmed before comparing and before the line is output, so "example.com " and "example.com" are treated as the same line. Switch to "Preserve whitespace" if those spacing differences matter for your use case and should be treated as different lines.
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