What counts as a line break?

The tool treats a CRLF pair, a lone CR, and a lone LF each as a single line break, so it handles text copied from Windows, classic Mac, and Unix sources consistently.

What's a good replacement string besides a space?

An empty string removes the breaks with no separator at all, while something like ', ' can turn a list of lines into a comma-separated sentence.

How is this different from the Line Break Replacer tool?

This tool is aimed specifically at joining multi-line text back into a single line; the Line Break Replacer tool is more general-purpose, for swapping newlines for any custom string like a visible '\n' marker.

Line Break Remover Online - Join Lines into One

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.

Limitations

Collapsing all line structure into one line loses paragraph boundaries; use the Paragraph Spacing Fixer instead if you want to keep paragraphs separate.

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.

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.

Tips

Use ', ' as the replacement to turn a plain list of lines into a readable comma-separated sentence.

Line Break Remover