Remove Duplicate Lines
Remove duplicate lines from text. Supports multiple deduplication modes. Runs entirely in your browser.
What deduplication modes are available?
Three modes: remove all duplicates (keep first occurrence), remove consecutive duplicates only, or keep only lines that appear exactly once (unique lines).
Does trimming affect comparison?
Yes, when trim is enabled, leading and trailing whitespace is removed from each line before comparison, so "hello" and "hello " are treated as identical.
Is my data safe and private?
Yes, 100% safe. All processing happens locally in your browser. Your text never leaves your device and is never uploaded to any server.
Is this duplicate line remover really free?
Yes, completely free with no hidden costs. No sign-up required, no limits on usage, and no watermarks.
Can I process large text files?
Yes, the tool handles large amounts of text efficiently. However, for extremely large files (100MB+), browser memory limits may apply.
Does it support case-sensitive deduplication?
By default, comparison is case-sensitive. "Hello" and "hello" are treated as different lines. Use the sort option to organize results alphabetically.