What happens to a trailing blank line in the input?

It becomes an empty item in the joined result, since the input is split on newlines before joining, and a trailing newline produces a trailing empty string.

Can the delimiter be multiple characters?

Yes, any string works as a delimiter, not just a single character, useful for delimiters like ", " or " | ".

Does it handle Windows line endings?

It splits on the newline character only, so text using CRLF endings leaves a carriage return at the end of each joined item. Normalize the line endings first if those invisible characters would cause trouble downstream.

Text Joiner Online - Combine Lines with a Delimiter

Overview

Introduction

Turning a line-per-item list back into a single delimited string, a CSV row, a pipe-delimited field, is the reverse of splitting.

This tool does it with any delimiter you choose.

What Is Text Joiner?

A joiner that splits the input on newlines and rejoins the resulting items with your chosen delimiter.

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 Text Joiner Works

The tool calls input.split("\n").join(delimiter).

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

When To Use Text Joiner

Use it to turn a pasted list of lines back into a single CSV row, pipe-delimited field, or comma-separated value.

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 Text Splitter and Text Sorter.

Features

Advantages

Works with any delimiter string, not just a single character.
Simple, predictable round trip with Split a String.
Is the exact inverse of Split a String, so text split on a delimiter and rejoined with that same delimiter comes back unchanged.

Limitations

A trailing blank line in the input produces a trailing empty item in the output.
Splits on the newline character alone, so carriage returns from Windows-style input survive into the joined output.

Examples

Joining a list with commas

Input

one
two
three
four

Output

one,two,three,four

Each line becomes one comma-separated value.

Best Practices & Notes

Best Practices

Remove trailing blank lines first with Remove All Empty Lines if you don't want an empty trailing item.
Choose a delimiter that cannot occur inside any of your values, otherwise the joined result cannot be split back apart correctly.
Strip carriage returns first when the source came from a Windows file, since they are carried straight through into each item.

Developer Notes

The implementation is `input.split("\n").join(delimiter)`, the direct inverse of Split a String's `input.split(delimiter)`.

Text Joiner Use Cases

Turning a pasted list back into a CSV row
Combining lines into a pipe-delimited log field
Rebuilding a delimited value after editing individual items

Common Mistakes

Leaving a trailing blank line in the input, which produces an unwanted trailing empty item.
Picking a delimiter that already appears within the data, which quietly makes the join irreversible.

Tips

Use Split a String to break the result back apart if needed.
Use ', ' when the result is meant to be read by a person, and a bare ',' when it needs to parse as CSV.

Text Joiner