SeparatorComma
Convert a list of items — one per line — into a single comma-separated string with this handy online tool. This is a frequent task for developers building SQL IN clauses, data analysts preparing CSV inputs, marketers formatting email lists, and anyone who needs to transform a vertical list into a horizontal, comma-delimited format. Paste your list of items and get the formatted output in one click.
Use Comma Tool in Seconds
Comma Separator
Interactive text engine
How To Use Comma Separator
- Paste your list of items into the input field — enter one item per line.
- The tool reads each line as a separate item and joins them with a comma and space separator.
- The comma-separated result is generated immediately and shown in the output area.
- Copy the formatted string for use in your SQL query, spreadsheet, API call, or CSV file.
- Optionally check if you need a trailing comma removed (some SQL dialects require this).
Frequently Asked Questions
What does this tool do?
It takes a list of items entered one per line and joins them together into a single comma-separated string. For example, entering 'apple', 'banana', 'cherry' on separate lines produces 'apple, banana, cherry'. This format is widely used in SQL queries (WHERE id IN (1, 2, 3)), CSV files, API parameters, and spreadsheet imports.
How is this useful for SQL queries?
SQL IN clauses require a comma-separated list of values — for example, SELECT * FROM products WHERE id IN (101, 102, 103, 104). If you have a list of IDs or names from another source (an export, a spreadsheet column, or a list from a colleague), this tool lets you paste them in and get the comma-separated format needed for the SQL query without manually adding commas after each value.
Does the tool add quotes around each item?
The basic comma separator joins items without quotes, which is appropriate for numeric values and already-quoted strings. For SQL queries using string values, you typically need each item wrapped in single quotes: 'apple', 'banana', 'cherry'. If your use case requires quoted output, check whether the tool offers a quoted option, or add the quotes to your items before pasting.
Can I customize the separator character?
The standard tool outputs comma-separated values with a space after each comma. If you need a different separator (such as semicolons for European locale CSV, pipe characters for certain data formats, or no space after the comma), you would need a more configurable text joining tool or a simple find-and-replace step after copying the output.
What is the reverse operation — splitting a comma-separated string into a list?
The reverse operation — turning a comma-separated string back into a line-by-line list — would be a comma splitter or CSV-to-list tool. This is the inverse of what this tool does. For that operation, you can use a text editor's find-and-replace feature (replace , with a newline) or look for a dedicated splitting tool. The Comma Separator handles only the joining direction.
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