Duplicate Lines Remover

Instantly find and remove all duplicate lines from a block of text or a list.

The Duplicate Lines Remover cleans up your lists and data by automatically identifying and deleting all redundant, identical lines. Essential for cleaning up mailing lists, keyword lists, or data entries. Remove duplicate lines now!

Options

Case Sensitive

Treat "Hello" and "hello" as different

ON: "Hello", "hello", "HELLO" → 3 unique lines
OFF: "Hello", "hello", "HELLO" → 1 line (first kept)

Trim Whitespace

Remove leading/trailing spaces

Applied before duplicate detection.
" hello " and "hello" → same line after trimming

Sort Output

Sort lines alphabetically

Sorts A→Z alphabetically.
Combine with "Reverse Order" for Z→A sorting.

Remove Empty Lines

Exclude blank lines from result

Removes all blank/empty lines after trimming.
Useful for cleaning up data.

Keep Last Occurrence

Keep last instead of first

OFF: Line 1, Line 2, Line 1 → keeps 1st "Line 1"
ON: Line 1, Line 2, Line 1 → keeps 2nd "Line 1"

Reverse Order

Reverse the output order

Reverses final output (bottom to top).
Applied after sorting if enabled.

Active Options: Case Sensitive Trim Whitespace Sort Output Remove Empty Keep Last Reverse Order

Processing Order

1 Trim Whitespace (if enabled) - Removes leading/trailing spaces

2 Remove Empty Lines (if enabled) - Filters out blank lines

3 Remove Duplicates - Keeps unique lines (respects case sensitivity)

4 Sort Output (if enabled) - Alphabetical A→Z sorting

5 Reverse Order (if enabled) - Flips final result

Enter your Text Here.

Upload File

total lines

characters

bytes

Please enter some text to process. The input cannot be empty.

Quick Templates: (Click to load sample data)

Processing Statistics

Unique Lines

Duplicates Removed

Reduction

Characters

Processed Text ( unique lines)

Recent Operations ()

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How to Use

Step-by-step guide 3 steps

1 Enter List: Paste your list or block of text, even if it contains thousands of lines with many duplicates.
2 Remove Duplicates: Click "Process List".
3 View Unique List: The tool instantly filters the text, outputs only the unique lines, and usually provides a count of how many lines were removed.

FAQ

Common questions 3 questions

Is the tool case-sensitive?

Typically, the tool performs a case-sensitive comparison by default, meaning "Apple" and "apple" are considered unique. Some advanced versions offer a case-insensitive option.

How does removing duplicate keywords help SEO?

When cleaning a keyword research list, removing duplicates ensures you don't waste time analyzing or targeting the same term twice, making your data set cleaner and more efficient.

Can this be used for database cleanup?

Yes, it is an essential step to remove duplicate entries from datasets before attempting to import them into a database or CRM.

Use Cases & Examples

Real-world applications 3 examples

Keyword Research

Example Keyword: remove duplicate keywords from list
Clean up massive lists of long-tail keywords gathered from multiple sources to create a master unique list.

Mailing List Cleanup

Example Keyword: remove duplicate emails from list
Ensure every email in your mailing list is unique before sending out a large email campaign.

Code Auditing

Example Keyword: find duplicate lines in code
Quickly remove repeated lines of code, configuration settings, or identical URLs in a log file.