Duplicate Line Remover & List Sorter
Remove duplicate entries from any list, sort alphabetically, trim whitespace and number lines. Paste your list and get a clean output instantly.
duplicate-remover.tool
Input (one item per line)
Output
When You Need to Remove Duplicates
Duplicate entries are a constant problem in data work. Email lists collected from multiple sources, URLs scraped from a site, product names from different databases, user submissions from a form — all tend to generate duplicates. Cleaning them manually is tedious and error-prone. This tool handles it in seconds for any size list.
Case-Insensitive Deduplication
The case-insensitive option treats Apple, apple and APPLE as the same entry. This is usually what you want — the same word in different cases is a duplicate in most real-world use cases. With case sensitivity on, Apple and apple are treated as different entries.
Frequently Asked Questions
Excel has a built-in Remove Duplicates feature under Data > Remove Duplicates. But if you have a plain text list in a notepad or a single column to clean quickly, pasting it here is faster than opening Excel. For large datasets with multiple columns, Excel's Remove Duplicates is more appropriate.
Yes — the tool processes entirely in your browser with no file size limit beyond your browser's memory. Practical performance is excellent up to tens of thousands of lines. For millions of lines, a command-line tool (sort | uniq on Linux/Mac, or PowerShell on Windows) will be faster.
Trim removes leading and trailing spaces, tabs and carriage returns from each line. This catches duplicates that look different on screen but are actually the same entry with different spacing. For example, ' apple' and 'apple ' and 'apple' all become 'apple' after trimming, and the duplicates are then caught correctly.
Yes — tick Sort alphabetically and then also tick Reverse order. The output will be Z to A instead of A to Z.
Removing duplicates eliminates repeated entries — if apple appears 5 times, 4 occurrences are removed and one is kept. Removing empty lines deletes blank rows with no content. Both options can be enabled simultaneously.