Text Utility
Duplicate Line Remover 🗑️

Instantly remove duplicate lines from any text or list. Supports case-insensitive matching, blank line removal, sorting, and more — all in one click.

📋 How To Use
1
Paste your list. Enter or paste your text into the input box. Each line is treated as one item. This works for email lists, keyword lists, code arrays, or any line-by-line data.
2
Configure your options. Choose whether to ignore case differences, remove blank lines, trim extra whitespace, or sort the result alphabetically. All options are toggleable independently.
3
Click Remove Duplicates. The cleaned list appears in the output box with a summary showing how many lines were removed and how many unique lines remain.
4
Copy your result. Click Copy Result to copy the cleaned list to your clipboard, ready to use wherever you need it.
⚙️ How It Works
🔍
Duplicate Detection
Each line is compared against all previous lines. The first occurrence is kept; all subsequent duplicates are discarded. Original order is preserved unless you enable sorting.
🔤
Case Insensitive
When enabled, “Apple”, “APPLE”, and “apple” are all treated as the same line. The first occurrence’s original casing is preserved in the output.
✂️
Trim Whitespace
Leading and trailing spaces on each line are removed before comparison. This catches near-duplicates that differ only due to accidental spaces (common in spreadsheet exports).
🔢
Sort Result
After removing duplicates, the remaining lines are sorted alphabetically A–Z. Numbers sort before letters. Useful for creating clean, organized lists ready for use in documents or databases.
❓ Frequently Asked Questions
Yes. This is one of the most common uses. Paste your email list with one email per line, enable “Ignore case” (since email addresses are case-insensitive), and click Remove Duplicates. The result will be a clean list with each unique email address appearing exactly once, ready for import into your email marketing tool.
Yes, by default the original order is preserved — the first occurrence of each line is kept and duplicates that appear later are removed. If you enable the “Sort result A–Z” option, the output will be alphabetically sorted instead. Disable sorting to maintain the original order.
By default, two lines are duplicates if they are identical after trimming leading and trailing whitespace and converting to the same case (when case-insensitive is enabled). With case-sensitive mode, “Apple” and “apple” are treated as different lines. With the trim option disabled, “apple ” and “apple” are treated as different lines.
There is no set limit. The tool can handle very large lists — tens of thousands of lines — since all processing runs locally in your browser. For very large datasets (hundreds of thousands of lines), performance depends on your device’s capabilities. For truly massive datasets, a dedicated scripting solution may be faster.
Absolutely. SEO professionals frequently use duplicate removers to clean keyword lists exported from tools like Google Keyword Planner, Ahrefs, or SEMrush. Paste your keywords (one per line), enable case-insensitive matching, and optionally sort A–Z for a clean, organized keyword list.
🔗 Related Tools
🧹Text Cleaner 🔡Case Converter 📝Word Counter 🔄Text Reverser