apple, banana, cherry
About Join & Split Lines – Multiline to Single Line
This multiline tool joins many lines into a single line with a separator you choose, or splits a single line back into multiple lines. It's the quickest way to turn a column of values into a comma-separated list — or to flatten text so it fits in a one-line field, log message, or spreadsheet cell.
Type or paste your text, pick a separator (commas, tabs, pipes, or any custom string, with escapes like \t supported), and the result updates live. Optional trim and skip-empty controls clean up stray whitespace and blank rows, and the prefix/suffix fields wrap each item for quoting list entries.
Everything runs entirely in your browser. Nothing you paste is uploaded, so it's safe for converting internal lists, IDs, or any sensitive data offline.
Features
- Join lines into one with any separator, or split a single line back out
- Trim each line and skip empty lines for clean output
- Wrap every item with a prefix and suffix to quote list entries
- Escape-aware separators (\t, \n) and fully offline
How to use
- Paste your lines (to join) or a single line (to split) into the input pane.
- Set the separator, and toggle Trim or Skip empty if you need them.
- Choose Join to collapse to one line, or Split to expand back to many.
- Copy the result from the output pane — or clear and start again.
Frequently asked questions
How do I turn a list into a comma-separated line?
Paste the list, set the separator to ", " (comma + space), and choose Join. Each line becomes one item in a single comma-separated line, ready to drop into CSV, SQL, or a config value.
Can I use a tab or other special character as the separator?
Yes. Type the literal character, or use escapes like \t for a tab and \n for a newline. The tool expands those escapes before joining or splitting.
What do Trim and Skip empty do?
Trim removes leading and trailing whitespace from each line before joining. Skip empty drops blank lines entirely, so you do not get empty items between your separators.
How do I quote each item, like for an SQL IN clause?
Set the prefix and suffix fields — for example a prefix of ' and a suffix of ', wraps every item before joining. Then join with a separator to build a quoted, comma-separated list.
Is my data sent anywhere?
No. All joining and splitting happens locally in your browser. Your input never leaves your device, so it is safe for private or internal data.
Related tools
Everything runs locally in your browser — your input is never uploaded.