How to Convert a List to Comma-Separated Values (and Back) Online

This is one of those micro-tasks that comes up constantly if you work with data, spreadsheets, email tools, or any kind of content management system — and yet most people don't have a fast, reliable way to do it.

You have a list. Each item is on its own line. But the tool you need to paste it into wants items separated by commas, not line breaks. Or the opposite: you have a comma-separated string from an export and you need each item on its own line so you can work with them one at a time.

The Comma Separator Tool handles both directions instantly.

Going From Lines to Commas

This is the most common direction. You have something like:

`` Red Green Blue Yellow `

And you need:

` Red, Green, Blue, Yellow `

Use cases include:

Spreadsheet formulas: Excel and Google Sheets functions like =COUNTIF and =FILTER often require comma-separated lists of values.

SQL queries: The IN clause in SQL needs values comma-separated: WHERE colour IN ('Red', 'Green', 'Blue').

Email marketing: Some platforms want your tag list or segment criteria as comma-separated values.

API calls: Many APIs accept arrays of values as comma-separated query parameters.

Copy formatting: When writing an article and listing items inline — "The colours are red, green, blue, and yellow" — converting from your notes list is faster than retyping.

Going From Commas to Lines

The reverse is equally common. You received or copied:

` Red, Green, Blue, Yellow ``

And you need each colour on its own line for a form, a list, a mail merge, or further processing.

Use cases include:

Pasting into forms: Many forms only accept one item per field, so you need to split your comma-separated list into individual entries.

Text processing: It's much easier to sort, filter, or edit items when they're each on their own line.

Importing into tools: List-based tools — including many of the tools on this site — work line by line, not comma-separated.

How to Use the Tool

Go to our Comma Separator Tool.

Select your mode — "Lines to commas" or "Commas to lines."

Paste your text into the input box.

The converted output appears instantly in the output box.

Copy and paste it wherever you need it.

No button to press, no page reload. It updates as you type.

Combining With Other List Tools

The Comma Separator Tool fits naturally into a list-processing workflow:

Clean first: Use Remove Extra Spaces or Remove Duplicates from List before converting to ensure your list is clean.

Sort before converting: Use Sort Text Alphabetically to put your list in order before turning it into a comma-separated string.

Count your items: Use Line Counter to confirm how many items you have before and after the conversion.

For more complex splitting needs — splitting on a pipe, semicolon, or tab rather than a comma — our Text Splitter offers custom separator options.