Duplicate Line Remover & List Deduplicator
Clean messy lists, email databases, keywords, and logs. Remove duplicate lines instantly with options to sort, ignore case, and trim whitespace.
How to Use Duplicate Line Remover & List Deduplicator
Paste Text List
Paste your list with one item or entry per line.
Configure Options
Toggle case sensitivity, whitespace trimming, and sorting.
Copy Clean List
Copy unique lines or download as a text file.
About Duplicate Line Remover & List Deduplicator
Utilizes JavaScript Set data structures with normalization filters to eliminate duplicate entries in O(n) linear time.
Supported Formats
Operational Limits
- •Processes lists of any size up to 100,000 lines in browser memory.
Key Features
- Instant deduplication with count metrics (original vs unique count)
- Case-sensitive or case-insensitive matching
- Alphabetical sorting (A-Z or Z-A)
- Option to remove empty lines
- One-click copy and .txt download
Frequently Asked Questions
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Whitespace Cleaner & Line Normalizer
Clean text whitespace: strip trailing spaces, collapse multiple spaces into single space, remove empty lines, and convert tabs to spaces.
Advanced Text Case Converter
Convert text into UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Alternating Case.