Remove Duplicate Lines
Paste text and instantly remove all duplicate lines. Supports case-insensitive matching, line trimming, and blank line removal.
Options
Frequently Asked Questions
Apple and apple are treated as the same line and the first occurrence is kept. When disabled (default), case differences are significant — Apple and apple would both be retained. apple and apple would be treated as duplicates of apple.How It Works
Paste Your List
Paste a list of items, one per line, into the textarea. The tool processes each line independently.
Set Options
Choose case-insensitive matching, trim whitespace before comparing, and whether to remove blank lines from the output.
Get Unique Lines
Click Run and see how many lines were removed. Copy the deduplicated output with one click.
Common Use Cases
Email List Cleanup
Deduplicate newsletter subscriber exports before importing to a CRM. Duplicate email addresses increase bounce rates and waste send quota.
SEO Keyword Research
Remove repeated keywords when merging exports from multiple tools like Ahrefs, SEMrush, and Google Search Console into a single master list.
Log File Processing
Deduplicate repeated log entries to surface unique error messages and warnings, making it faster to identify distinct failure modes.
CSV Data Cleaning
Remove duplicate rows from exported reports before analysis. Clean data prevents skewed metrics and double-counting in aggregations.
Code Import Statements
Clean up merged lists of import or require statements. Remove duplicates introduced when combining files or refactoring modules.
Dictionary & Word Lists
Eliminate duplicate entries in word lists, dictionaries, or blocklists used by spell-checkers, autocomplete systems, or content filters.
