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Duplicate Line Remover
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Efficiently remove duplicate lines from text while preserving the original line order.
Enter text to see the joined result
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Despite the page title, the current operation joins text lines; it does not find or remove duplicates. Paste multiline text, choose what separates an input line, decide how whitespace and blank lines are handled, then choose the text inserted between retained lines. The output follows the order in the input. Repeated entries remain repeated.
The line separator tells the tool where to split the input. By default it is a newline; the special two-character backslash-n value also represents a newline. The joiner is inserted between the resulting lines and defaults to an empty string. For example, input red on one line and blue on the next, with joiner , , becomes red, blue.
Whitespace handling has three choices: keep each line as-is, trim whitespace from each line’s beginning and end, or remove all whitespace within each line. The last option also removes spaces inside phrases. Empty-line handling separately keeps or removes blank entries. “Trim” follows the language’s standard string trimming behavior.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Start with one item per line, or enter a different exact line separator if the source uses one.
Enter a comma and space, pipe, semicolon, or another string to place between adjacent items. Leave it blank only when direct concatenation is intended.
Use trim for extra whitespace at line edges. Keep as-is when spaces matter. Remove all whitespace only when you want spaces inside each line removed too. Choose whether blank entries should remain.
Check the beginning, middle, and end of the output for missing separators or changed spaces, then use the result’s copy control.
If the input is North;South;West, set the line separator to a semicolon and the joiner to | to produce North | South | West. The input delimiter and output joiner can be different.
Use cases
See how the tool fits into real work and everyday tasks.
Combine a list copied from a document or spreadsheet with commas or semicolons, then verify that the destination accepts those separators.
Join one-item-per-line labels, IDs, or paths for a form or editor. Preserve spaces if they are part of the values, and review repeated entries before copying.
Q&A
Find concise answers to common questions and confusing cases.
The default joiner is empty, so lines are concatenated directly. Enter the separator you want between neighboring values.
No. Every split item is retained in its original order, including repeated items. The page title can be misleading; use a true deduplication workflow if duplicates need removal.
The trim option affects only the beginning and end of each line. The separate remove-all-whitespace option also removes spaces within the line.
Yes. Choose the keep option under empty-line handling. The default removes empty entries after the selected whitespace handling is applied.
Notes
Review scope, result limitations, and important precautions before use.
The visible title says “Duplicate Line Remover,” but the controls perform splitting, whitespace handling, blank-line handling, and joining. They do not compare lines or delete duplicates. Do not treat the result as a deduplicated list.
This is a literal text transformation, not a CSV parser. If a delimiter appears inside a value, the split may divide that value. It does not add quotes or escape commas for another program, so confirm the receiving format’s rules before using the joined string.
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