Remove Duplicate Lines
Paste any text and instantly remove all duplicate lines.
Paste text to clean
Results update instantly in your browser as you change the text or options.
Deduplication options
Choose how lines should be compared and how the final result should be arranged.
Original lines
7
Lines found in the pasted text.
Unique lines
4
Lines kept in the cleaned result.
Duplicates removed
3
Repeated lines removed after matching.
Characters saved
19
Approximate text reduction after cleanup.
Insights
What changed in your text
Unique output
The result keeps 4 unique lines from 7 original lines.
Removed duplicates
3 duplicate lines were removed using your current matching options.
Blank line handling
Blank lines are treated like normal lines, so only repeated blank lines are deduplicated.
Options
How the cleanup settings work
Case sensitive
When enabled, Apple, APPLE, and apple are different lines. Turn it off when capitalization should not matter.
Trim whitespace
Trimming removes extra spaces before matching, so “ apple ” and “apple” are treated as the same value.
Remove blanks
Blank lines can be deleted completely when you want a compact list without empty separators.
Sort A-Z
Sorting alphabetizes the cleaned result after duplicates are removed. Leave it off to preserve list order.
Use cases
When to remove duplicate lines
Email and contact lists
Clean copied address lists before importing them into a CRM, newsletter tool, or spreadsheet.
Repeated headers and footers
Remove repeated table headings, report headers, copied page footers, and boilerplate lines from combined text.
Keyword and tag cleanup
Deduplicate keyword exports, tags, product attributes, or category lists while keeping a readable order.
Logs and data checks
Reduce noisy repeated log lines so unusual entries and unique messages are easier to review.
Examples
Duplicate-line cleanup workflows
Clean a copied contact list
Paste one email address per line, keep Trim whitespace on, turn Case sensitive off if capitalization should not matter, then copy the unique list back to your spreadsheet or CRM.
Reduce repeated log lines
Paste log excerpts, keep first occurrence to preserve the earliest message, and leave sorting off so the output follows the original investigation order.
Tidy keyword exports
Paste keywords or tags line by line, remove blank lines, deduplicate, then optionally sort A-Z before using the list in a content brief.
Method
How duplicate lines are detected
Line-by-line matching
The tool splits your text at each line break, creates a comparison key for every line, then keeps only the first or last line with that key. This makes it useful for plain lists, copied spreadsheet rows, repeated headers, repeated footers, and log output.
Order-preserving cleanup
By default, the original order is preserved so your list stays familiar. Sorting is optional and should be used when alphabetical order is more important than keeping the source order.
Related tools
Continue cleaning text
FAQ
Remove duplicate lines questions
A duplicate line is a line that matches a line already found in the text. If case-sensitive matching is turned off, Apple and apple are treated as the same line. If trim whitespace is turned on, extra spaces at the start or end are ignored.
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