String Join

String joining is the process of combining multiple lines of text into a single line by inserting a separator between each line. It is commonly used in programming, data formatting, and preparing CSV or SQL content.

Paste your multi-line text into the input area, choose or type a separator (such as comma, space, or any custom string), and the tool instantly merges all lines into one continuous string.

You can use any character or string as a separator: comma, space, semicolon, pipe, tab, newline (\n), or even multi-character strings like ' | ' or ' - '.

Yes. Leave the separator field empty and the tool will concatenate all lines directly, creating one continuous string with nothing between the original lines.

Absolutely. All processing happens locally in your browser. No text is uploaded to any server, and no data is stored or logged. Your content stays completely private.

There is no hard limit. Since the tool runs entirely in your browser using JavaScript, it can handle thousands of lines efficiently. Performance depends on your device.

String join merges multiple lines into one string with a separator, while string split does the opposite — it breaks a single string into multiple parts based on a delimiter. They are inverse operations.

Yes. Paste one value per line, use a comma as the separator, and you will get a properly formatted CSV row ready to use in spreadsheets or databases.

Yes. The tool maintains the exact order of your input lines. The first line in the input becomes the first segment in the output, and so on.

Yes, it is completely free. No registration, no ads, no usage limits. You can use it as many times as you need.