Convert Newline To Comma

Simple online tool that replaces each newline character with a comma to turn multiline lists into comma-separated strings. Use it to convert lines to comma-separated values, build lists for SQL IN clauses, or prepare single-line arrays. This operation is atomic - it only replaces newlines and does not trim surrounding spaces.

How it works

• Replaces newline characters (LF or CRLF) with a comma.
• Does not trim or remove spaces - leading/trailing spaces remain adjacent to the new commas.
• Empty lines become empty entries (you may see consecutive commas).

How to use

1. Paste your multiline text into the editor.
2. Choose Edit -> New Line to Comma.
3. Copy the comma-separated result, or use Edit -> Comma to New Line to reverse it.

Use cases & examples

• SQL IN list

  Convert a column of values into a comma-separated list for a WHERE ... IN(...) clause.

  Before:

  'red'
  'green'
  'blue'

  After:

  'red','green','blue'

• Emails for import

  Turn one-email-per-line into a single import-friendly list.

  Before:

  alice@example.com
  bob@example.com
  carol@example.com

  After:

  alice@example.com,bob@example.com,carol@example.com

• Hashtags / keywords

  Prepare hashtags or keyword lists for social planning tools.

  Before:

  #summer
  #sale
  #outdoor

  After:

  #summer,#sale,#outdoor

• Simple arrays / config strings

  Create compact single-line arrays or config values for quick copying into code or docs (note: not a CSV formatter).

  Before:

  apple
  banana
  cherry

  After:

  apple,banana,cherry

Chaining Tools

• To remove extra spaces around items before conversion, run Trim first - Trim can remove whitespace or any characters you specify.
• To remove empty lines before conversion, run Remove Empty Lines.
• Remove duplicate entries before conversion using Remove Duplicates.
• To convert back or change separators after conversion, use Find and Replace or Edit -> Comma to New Line.

Tips & edge cases

Empty lines become empty entries

If your input contains blank lines, the output will include empty entries (consecutive commas). Run Remove Empty Lines first to avoid extra commas.

Leading and trailing spaces remain

This tool does not trim items. Leading/trailing spaces around each line will remain after conversion. Use Trim (which can remove whitespace or any specified characters) to clean items before converting.

Not a full CSV tool

The operation is intentionally simple - it replaces newlines with commas only. For structured CSV work (quoting, escaping commas inside fields), chain Trim and other cleanup tools first and use a dedicated CSV tool afterward.

Large lists and browser limits

Very large inputs may hit browser or editor memory limits. If you work with very big lists, process them in smaller batches or use a local script for production workflows.

Related tools

• Remove Empty Lines
• Trim
• Remove Duplicates
• Find and Replace
• Comma to New Line

FAQ

Q: Does this tool trim spaces?

A: No. It only replaces newline characters with commas. Use Trim to remove surrounding spaces or any characters you specify before conversion.

Q: What happens to empty lines?

A: Empty lines become empty entries (you will see extra commas). Run Remove Empty Lines first to prevent that.

Q: Can I undo the operation?

A: Yes - use the Edit -> Comma to New Line action or replace commas with newlines via Find and Replace.

Q: Is this a CSV converter?

A: No - it's a simple newline->comma operation useful for many list transformations. For CSV-ready data, clean items (Trim, Remove Empty Lines) first and then use a CSV-specific tool if needed.

Paste your multiline text and run New Line to Comma. Chain Trim and Remove Empty Lines when you need cleaner, CSV-ready results.