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Duplicate Line Remover
A duplicate line remover takes a pasted list and returns only the unique lines, which is the fastest way to clean a keyword export, a backlink dump, a redirect map, or any plain-text list where the same entry has crept in more than once. Rather than scanning thousands of rows by eye, the tool compares every line, removes the repeats, and tells you exactly how many duplicates it dropped and how many unique lines remain.
This deduplicator is completely free and runs entirely in the browser, so even a large list never leaves your machine. Comparison can ignore case and surrounding spaces, you choose whether the first or last copy of each line survives, and the cleaned output can be sorted alphabetically or numerically and reversed before you copy or download it.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
How to remove duplicate lines from a list
Paste your list in the left box and the unique lines appear on the right as you type. Set how lines are compared, choose which copy to keep, pick a sort order, then copy or download the result.
Decide how two lines count as the same
Whether two lines are duplicates depends on how strictly you compare them. With case-insensitive matching on, Apple and apple collapse into one entry, which is usually what you want for keywords and tags but not for case-sensitive data like passwords or IDs. Trimming spaces before comparison treats cherry and cherry as identical, catching the invisible duplicates that pasted exports often hide. Toggle both options and watch the removed-duplicates count change so you can confirm the comparison matches your intent before trusting the output.
Choose which copy of a duplicate to keep
When a line repeats, only one copy survives, and which one can matter. Keeping the first occurrence preserves the original ordering of a manually curated list, so the earliest entry wins and its position is held. Keeping the last occurrence is useful when later rows carry the more recent or corrected version, such as an updated export appended to an older one. The tool keeps the exact original text of the copy you choose, including its capitalization and spacing, even when the comparison itself was case-insensitive or trimmed.
Sort, reverse, then copy or download
Once duplicates are gone you can leave the lines in their original order or sort them. Alphabetical A-Z and Z-A ordering organizes keyword and URL lists, while numeric sorting reads the first number on each line so Item 2 falls below Item 10 instead of above it, with non-numeric lines pushed to the bottom. The reverse switch flips whatever order you end up with. The finished list copies to your clipboard in one click or downloads as a plain .txt file ready to paste into a spreadsheet or script.
Duplicate line remover frequently asked questions
Q1Does removing duplicates change the order of my list?
Not unless you ask it to. With sorting set to no sort, the unique lines stay in the order they first appeared, so a curated list keeps its structure. Choosing an A-Z, Z-A, or numeric sort reorders the cleaned output, and the reverse switch flips it. The original order is always preserved by default until you pick a different option.
Q2What is the difference between keeping the first and last occurrence?
Both leave exactly one copy of each repeated line; they differ in which copy survives. Keep first retains the earliest copy and its position, which suits hand-ordered lists. Keep last retains the final copy, which helps when newer or corrected entries were appended below older ones. The text kept is always the exact original line, including its own capitalization and spacing.
Q3Will it catch duplicates that have different capitalization or extra spaces?
Yes, when you enable those options. Ignore case treats Apple and apple as the same line, and trim spaces before comparing treats a line with leading or trailing spaces as identical to the clean version. Both are on by default because pasted exports frequently hide repeats behind invisible spacing or inconsistent case. Turn them off for case-sensitive or whitespace-sensitive data.
Q4Is my list uploaded anywhere when I use this tool?
No. The entire deduplication runs in your browser with client-side JavaScript, so nothing you paste is sent to a server, logged, or stored. The tool keeps working even after you disconnect from the internet once the page has loaded, which makes it safe for sensitive lists such as internal URLs, email collections, or unreleased keyword research.
Q5How many lines can this duplicate remover handle?
It comfortably handles lists of tens of thousands of lines because deduplication uses a hash lookup that scales close to linearly rather than comparing every line against every other. Performance depends on your device, but typical keyword, URL, and redirect exports process instantly. Very large pastes of hundreds of thousands of lines may take a moment to render the output.
