Remove Duplicate Lines
Paste your lines of text and remove duplicates instantly. Options to sort alphabetically and toggle case sensitivity.
📖 How to Use
Paste your text with one item per line. Toggle options for sorting, case sensitivity, and trimming whitespace. Click Remove Duplicates to get your unique lines instantly.
When You Need Deduplication
Duplicate lines creep into data more often than you'd expect. Email lists exported from multiple sources contain overlapping entries. Log files repeat the same error messages thousands of times. Keyword lists from SEO tools are riddled with duplicates.
Manually finding and removing duplicates in a spreadsheet or text file is tedious and error-prone. This tool handles it instantly — paste your list, click once, and get clean, unique results. No formulas, no scripting, no sign-up required.
Options Explained
Case Sensitivity
When enabled, "Hello" and "hello" are treated as different lines. Disable it to treat them as duplicates regardless of capitalization.
Sort Results
Alphabetically sorts the unique lines after deduplication. Useful when you need an ordered list like a glossary or directory.
Trim Whitespace
Removes leading and trailing spaces from each line before comparing. This catches duplicates that only differ by invisible spacing.
Skip Empty Lines
Removes blank lines from the output so your results are compact and clean without gaps between entries.
Frequently Asked Questions
Does this keep the first or last occurrence?
The first occurrence of each unique line is kept, and all subsequent duplicates are removed. The original order is preserved unless you enable sorting.
How many lines can it handle?
Since it runs in your browser, it can handle tens of thousands of lines easily. For extremely large datasets (100,000+ lines), performance depends on your device.
Is my data private?
Yes. Everything runs in your browser. No data is uploaded or stored on any server. Your text stays on your device.