Staaarter Tools

Line Break Remover

Strips all line break characters from text and joins the resulting lines back together with a chosen replacement string, a single space by default, turning multi-line text into one continuous line. A free online tool from Staaarter, right in your browser.

Runs locallyUpdated 2026-07-23
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Overview

Introduction

Multi-line text sometimes needs to become a single line, for example when preparing a value for a CSV field, a URL parameter, or a log line that can't contain raw newlines.

Manually deleting every line break in a long block of text is tedious and easy to miss a few instances of.

What Is Line Break Remover?

A line break remover that strips every newline from a block of text and joins the resulting pieces with a chosen replacement string.

It runs entirely client-side as part of this site's String Tools collection, so nothing you paste is ever uploaded to a server.

How Line Break Remover Works

The tool splits the input on any line break sequence, CRLF, lone CR, or lone LF, and rejoins the resulting array of lines using the replacement string as the separator.

The transformation happens synchronously in JavaScript the moment you type, with no network round trip involved.

When To Use Line Break Remover

Use it to flatten multi-line text into a single line for a CSV field, a log entry, or any format that can't contain raw line breaks.

It's a fast way to get the answer without opening a code editor, a REPL, or writing a one-off script just to check.

Often used alongside Line Break Replacer, Empty Line Remover and Line Break Adder.

Features

Advantages

  • Handles CRLF, CR, and LF line endings uniformly in one pass.
  • Replacement string is fully customizable, not fixed to a space.
  • Splits on the full line-ending sequence before rejoining, so a CRLF pair contributes a single separator rather than two.

Limitations

  • Collapsing all line structure into one line loses paragraph boundaries; use the Paragraph Spacing Fixer instead if you want to keep paragraphs separate.
  • Applies the same replacement to every break, so paragraph gaps cannot be treated differently from line wraps inside a paragraph.

Examples

Joining lines with a space

Input

line one
line two
line three

Output

line one line two line three

With the default replacement of a single space, each line break is replaced and the lines merge into one.

Best Practices & Notes

Best Practices

  • Use an empty replacement string when the line breaks were only there for visual formatting and no separator is actually needed.
  • Use a single space when unwrapping hard-wrapped prose, since that is what the line breaks were standing in for.
  • Run the Line Break Normalizer first when the text contains runs of blank lines, otherwise each blank line contributes its own separator.

Developer Notes

The implementation is `input.split(/\r\n|\r|\n/).join(replacement)`, which normalizes all three common line-ending styles before rejoining, rather than a single global regex replace.

Line Break Remover Use Cases

  • Flattening a multi-line address or note into one CSV field
  • Preparing multi-line text for a system that rejects raw newlines
  • Turning a list of lines into a comma-separated sentence

Common Mistakes

  • Using this tool when you actually want to keep paragraph breaks but collapse only excess blank lines; the Line Break Normalizer or Paragraph Spacing Fixer tools fit that case better.
  • Leaving the default space in place when rejoining a word that was hyphenated across a line break, which inserts an unwanted gap mid-word.

Tips

  • Use ', ' as the replacement to turn a plain list of lines into a readable comma-separated sentence.
  • An empty replacement rejoins words that were split across lines correctly, which a space replacement would not.

References

Frequently Asked Questions