Remove Duplicate Lines — Keep Only Unique Lines

Clean up duplicate lines in seconds

If you have ever copied a list from a spreadsheet, exported a report, or pasted notes from multiple sources, you have probably seen the same line appear more than once. Duplicate lines make lists harder to read, inflate counts, and can cause errors when you import data into another tool. This duplicate line remover gives you a fast, no-friction way to dedupe text and keep only one copy of each line.

What the tool does in plain language

The calculator treats each line as a separate item. It compares those lines and removes repeats so you get a clean list of unique entries. You can keep the original order of the first occurrence, which is useful when the sequence matters. Because it runs in your browser, your text stays private and never leaves your device.

Step-by-step: how to remove duplicates

1. Paste or type your list into the input box.
2. Choose your options for case sensitivity and whitespace trimming.
3. Click the Remove Duplicates button to process the text.
4. Copy the result or download it as a .txt file.

Options explained simply

• Ignore Case: When enabled, "Apple" and "apple" are treated as the same line. This is helpful for name lists, tags, or titles where capitalization varies.
• Trim Whitespace: Removes leading and trailing spaces or tabs before comparing lines. This catches duplicates that look identical but differ only by invisible spacing.

Real-world examples

People use this tool to dedupe email lists before sending newsletters, clean up product catalogs, and remove repeated values from survey responses. Developers and analysts use it to tidy log files, lists of URLs, and configuration lines. Students and writers use it to clean references or vocabulary lists. Even simple tasks like removing repeated grocery items or checklist entries become quicker when duplicates are removed automatically.

Whether you call it a duplicate line remover, a text dedupe tool, or a remove duplicates online utility, the goal is the same: a clean, unique list with less manual work.