Does it handle Windows-style line endings?

Yes, \r\n, \r, and \n are all recognized and each replaced with a single space, so mixed line-ending files convert cleanly.

Does it collapse multiple consecutive blank lines into one space?

Each individual line break becomes its own space, so a blank line (two consecutive breaks) produces two spaces, not one.

Does it trim the result?

No. A leading or trailing line break becomes a leading or trailing space, so the output can begin or end with whitespace. Trim it afterwards if that matters for where the text is going.

Newlines to Spaces Online - Join Multi-Line Text

Overview

Introduction

Multi-line text sometimes needs to become a single continuous line, for a log entry, a single-line config value, or pasting into a field that doesn't accept line breaks.

This tool joins it in one step.

What Is Newlines to Spaces?

A converter that replaces every line break, regardless of style, with a single space character.

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 Newlines to Spaces Works

A regex matching \r\n, \r, or \n is replaced globally with a single space.

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

When To Use Newlines to Spaces

Use it when preparing multi-line text for a single-line field, or when flattening a paragraph for a log entry.

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 Spaces to Newlines and Text Joiner.

Features

Advantages

Handles all three common line-ending styles in one pass.
Matches the two-character CRLF sequence ahead of the single-character forms, so a Windows line break yields one space rather than two.
Leaves every other character untouched, so tabs and existing spacing survive the conversion exactly as they were.

Limitations

Doesn't collapse the resulting spaces if the source had multiple consecutive line breaks; pair with Remove All Whitespace if you need fully collapsed spacing.
Converts each break to exactly one space and trims nothing, so text that began or ended with a newline picks up leading or trailing whitespace.

Examples

Joining lines

Input

one
two
three

Output

one two three

Each newline becomes a single space.

Best Practices & Notes

Best Practices

If the source has blank lines you want collapsed too, follow up with a whitespace-collapsing step.
Follow with the Extra Space Remover whenever the source contained blank lines, since each one contributes a space of its own.
Use it to flatten text before pasting into a single-line field such as a spreadsheet cell or a CSV value.

Developer Notes

The regex `/\r\n|\r|\n/g` matches all three line-ending conventions in priority order (checking the two-character \r\n first), so Windows-style line endings aren't split into two separate replacements.

Newlines to Spaces Use Cases

Flattening a multi-line paragraph into one line for a log entry
Preparing multi-line text for a single-line input field
Joining a multi-line address into one line

Common Mistakes

Expecting consecutive blank lines to collapse into a single space automatically.
Expecting paragraph structure to survive; every break is treated identically, so paragraph boundaries vanish along with the wrapping.

Tips

Use Spaces to Newlines to reverse this operation.
Two consecutive breaks become two spaces, so counting doubled spaces in the result is a quick way to see where the paragraphs used to be.

Newlines to Spaces