Clean a list by removing duplicate lines, with options for case sensitivity, trimming whitespace and discarding empty lines. Shows exactly how many duplicates were removed.
Getting started
Paste your list, one item per line.
Choose whether comparison should ignore case and surrounding whitespace.
Optionally remove empty lines at the same time.
Copy the deduplicated result, and check the summary for how many lines were removed.
Why it helps
Preserves the original order, keeping the first occurrence of each item.
Case-insensitive matching catches duplicates that differ only in capitalisation.
Whitespace trimming catches duplicates with stray trailing spaces — the most common hidden cause.
Handles very large lists quickly because processing is local.
In practice
Cleaning an email or subscriber list before importing it into a mailing platform.
Deduplicating a keyword list exported from multiple SEO tools.
Tidying a URL list before submitting it for indexing.
Removing repeated entries from log output or exported data.
Everything people ask most about the remove duplicate lines, answered plainly.
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