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Remove Duplicate Lines
Paste any list and strip duplicate lines in one click — with case control, trimming, sorting, and live counts. Free, private, no signup.
100% privateDeduping runs entirely in your browser. Your list is never uploaded to any server.
No signupClean your list instantly. No accounts, no email, no waiting.
Free foreverUnlimited lines, all options included, no locked features.
How to use the duplicate line remover
- 1Paste your list
Drop in any one-item-per-line list — emails, URLs, keywords, names, SKUs. Duplicates are flagged the moment you paste.
- 2Set your options
Toggle ignore-case matching, trim whitespace, drop empty lines, sort A to Z, or keep the last occurrence instead of the first.
- 3Watch the live counts
Total lines, unique lines, and duplicates removed update as you type, so you always see exactly what changed.
- 4Copy or download
Copy the clean list to your clipboard or download it as a .txt file for Excel, Google Sheets, or your email tool.
Features
Instant live dedupingResults update with every keystroke. No buttons to press, no waiting on a server.
Case-smart matchingChoose whether Apple and apple count as the same line — essential for cleaning email lists and keyword sets.
Whitespace cleanupTrim stray spaces and tabs, and strip blank lines, so invisible junk never survives into your final list.
Sort A to ZAlphabetize the cleaned list in one toggle — handy before pasting into spreadsheets or reports.
Keep first or lastDecide which duplicate survives: the first appearance, or the most recent one when later entries are corrected versions.
Private by designYour list never leaves your browser. Paste client emails and keyword data with confidence.
Frequently asked questions
Is this duplicate line remover really free?
Yes. Remove duplicates from unlimited lines with no signup and no limits. Every option on this page is free forever.
What counts as a duplicate line?
Two lines with exactly the same text. Your options change the definition: Ignore case treats Apple and apple as the same, and Trim whitespace ignores leading and trailing spaces when comparing.
How does “Ignore case” work?
With it on, Apple, apple, and APPLE are treated as one line. The surviving line keeps its original capitalization — so the first Apple in your list stays Apple.
Should I keep the first or the last occurrence?
Keep first occurrence preserves the original order of first appearance, which is what most people want. Uncheck it to keep the last occurrence instead — useful when later entries are corrected or updated versions of earlier ones.
Does it remove blank lines?
Only if you enable Remove empty lines (it is on by default). With it off, blank lines are treated like any other line and deduplicated normally.
Is there a size limit?
No hard limit. The tool comfortably handles tens of thousands of lines instantly; pastes over 100,000 lines may take a moment since everything is processed live in your browser.
Is my list uploaded or saved anywhere?
No. Deduping happens entirely in your browser with JavaScript. Your text never leaves your device and nothing is stored or logged.
Can I sort the deduplicated list?
Yes. Turn on Sort output A–Z to alphabetize the cleaned list. Sorting is case-insensitive, so apple comes before Banana, matching spreadsheet behavior.
