Why does it still show duplicates?

Almost always trailing spaces or differing capitalisation. Turn on trim and ignore case and they collapse.

Is the original order kept?

Yes unless you ask for sorting. The first occurrence of each line stays where it was.

Whichever you choose. Keeping the first preserves the original order; keeping the last is what you want when later lines are corrections.

Something invisible differs — a trailing space, or a capital letter. Turn on trimming and ignore case and they collapse.

Strip repeated lines with control over trimming, case, blanks and sort order.

Runs in your browser — nothing uploaded

Paste your list.
Choose whether to trim whitespace, ignore case, drop blank lines and sort the result.
Copy or download what comes out.

Why does it still show duplicates?: Almost always trailing spaces or differing capitalisation. Turn on trim and ignore case and they collapse.
Is the original order kept?: Yes unless you ask for sorting. The first occurrence of each line stays where it was.
Does it keep the first or the last copy?: Whichever you choose. Keeping the first preserves the original order; keeping the last is what you want when later lines are corrections.
Why are lines that look identical not removed?: Something invisible differs — a trailing space, or a capital letter. Turn on trimming and ignore case and they collapse.

Duplicate Remover does all of these. Looking for something else? Search every tool.

Words, characters, sentences, paragraphs and reading time, live as you type.

Sentence case, Title Case, UPPER, lower, camelCase, snake_case, kebab-case and more.

Plain text or regex, with a live match count and capture groups in the replacement.

Placeholder copy in eight scripts — Latin, English, Bengali, Hindi, Arabic and more.