Duplicate Line Remover

First occurrence wins, order stays intact.

Deduplicating a list of emails, URLs, tags, or names sounds trivial until case differences ('Apple' vs 'apple') or stray trailing whitespace cause a naive dedup to either miss real duplicates or incorrectly treat identical entries as distinct. This tool removes duplicate lines from any pasted list, keeping the first occurrence of each and preserving the original order — with explicit control over whether matching is case-sensitive and whether leading/trailing whitespace is ignored, so the result matches what you actually mean by 'duplicate' for your specific list.

• →Removes duplicate lines while keeping the first occurrence and original list order intact
• →Configurable case-sensitive vs. case-insensitive matching for accurate results
• →Configurable whitespace trimming to catch duplicates that differ only by stray spaces
• →Shows exactly how many duplicates were removed and the before/after line count
• →Watermarked by Cikal Studio Labs · Works on any device, no install required