Duplicate Line & List Cleaner
Utilix Duplicate Line & List Cleaner is a high-speed O(N) Set deduplication utility that strips duplicate rows, trims whitespace, injects custom prefixes/suffixes, and sorts lists alphanumerically inside browser RAM.
How to Remove Duplicate Lines from a Massive List and Sort Alphanumerically?
Paste your list into Utilix Duplicate Line & List Cleaner to deduplicate up to 100,000+ lines in milliseconds using an ES6 Set hash table, with instant toggles for case sensitivity, empty line removal, natural sorting, and line prefix/suffix wrapping.
How to use Duplicate Line & List Cleaner
- Paste Multi-Line List: Paste emails, URLs, keywords, or log lines into the editor.
- Set Deduplication & Sort Rules: Choose case sensitivity, A–Z / Z–A / Length sorting, and optional prefix/suffix strings.
- Copy or Download Cleaned List: Inspect exact removed duplicate counts and export your unique list.
Frequently asked questions
How fast can it deduplicate 100,000 lines?
Because Utilix uses an O(N) JavaScript Set hash lookup rather than nested loops, 100,000 lines process in under 25 milliseconds.
How can I wrap every line in single quotes and a comma for a SQL IN() clause?
Type `'` in the Prefix box and `',` in the Suffix box to wrap every unique line automatically.
What is Natural Alphanumeric Sorting?
Natural sorting places "item2" before "item10" (numeric value order) rather than strict ASCII order.
Does Case-Insensitive mode preserve the original casing of the first occurrence?
Yes, it tracks lowercase keys in the Set while preserving the original display casing of the first kept line.
Are my email or keyword lists uploaded anywhere?
No, all list cleaning runs strictly inside your browser.