Remove duplicate lines from a list free
Keywords, emails, negatives: duplicates and empty lines gone, sorting as a bonus.
The list before and after cleanup
How to clean a list in 4 steps
One item per line.
Duplicates, empty lines, A-Z sorting.
The counter shows how many lines left.
And paste into your dashboard or sheet.
Part of the Zerocoder platform
One tool of a platform where AI generates websites, images, video, text and documents — under one subscription.
Lists grow duplicates on their own: keywords merged from three sources, email exports, negatives glued from old campaigns. The tool strips repeats and empty lines, sorts alphabetically and reports how many lines went away. Tens of thousands of lines process instantly right in the browser — data never leaves the page. Normalise case first in the case converter; word frequency in prose is measured by the density checker. All tools — in one section.
Keyword hygiene for ad campaigns
Keywords come from suggesters, competitors and old campaigns — the overlaps breed hundreds of duplicates. A duplicate in a campaign means bidding against yourself and dirty statistics. A one-minute cleanup before uploading saves budget. Remember: “buy site” and “Buy site” are different lines; normalise case first.
Email lists: duplicates mean double sends
A mailing base glued from several exports means duplicate emails to the same people — the straight road to spam complaints. Dedupe before importing into your mailing service. Alphabetical sorting also exposes near-duplicates: typo@ and typo1@ land side by side where you'll spot them.
Why in-browser beats online services
Email lists and campaign keywords are commercial data: a leaked base costs more than any tool. Here processing is local: your tab's JavaScript, zero network requests. Verify in the browser inspector — clicking the button fires nothing.
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FAQ
What counts as a duplicate?
An exact character-for-character line match. “Word” and “word” differ — normalise case first.
How many lines can it handle?
Tens of thousands — all in the browser, instantly.
Is line order preserved?
Without sorting — yes: the first occurrence stays in place.
Do trailing spaces matter?
Yes, a line with a trailing space is a different line. Empty lines have their own option.
Is sorting locale-aware?
Yes — accented and special characters sort correctly.
Is my data uploaded?
No, the list never leaves your page.
Do I need an account?
No: the tool is free and unlimited.
Does it show statistics?
A “lines before → after” counter appears after processing.
What else does Zerocoder do?
AI ad copy and texts, courses, jobs — list cleanup is one small utility.