Remove duplicate lines from text lists, logs, or email collections. Preserves order, trims whitespace, and ignores empty lines.
SmartToolkit uses JavaScript's high-speed Set data structure, which provides O(1) average time complexity lookups for each line. Even when processing lists containing 50,000+ lines, the browser resolves unique entries in milliseconds without freezing.
When "Case Sensitive" is unchecked, each line is converted to lower case strictly for hash comparison while preserving the original casing of the first-encountered instance in the final output.
Original input (4 lines):
user@example.com
admin@example.com
USER@EXAMPLE.COM
admin@example.com
With case sensitivity disabled, the deduplication engine detects that lines 1 and 3 are identical, and lines 2 and 4 are identical. The cleaned result produces 2 unique lines, removing 2 duplicate entries.
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