What is a string joiner?
A string joiner combines a list of strings into one result. Each input line is treated as one item, and the selected separator is inserted between items.
The separator can be a space, comma, pipe, Tab, new line, an empty string, or custom text such as / or and. Join and concatenate are often used interchangeably, but join usually describes combining a list with a separator.
How to join strings online
- Enter or paste one string per line, or select Example.
- Select a separator from the toolbar, or select Custom and enter your own text.
- Open Options if you need to keep empty lines or surrounding whitespace.
- Copy the joined result.
The output updates immediately. By default, the tool joins items with a space, trims each line, and ignores empty lines.
String joiner examples
Comma-separated list
Input:
applebananaorangeSelect Comma + Space to get:
apple, banana, orangeJoin without a separator
Input:
BittyCoderSelect None to get:
BittyCoderReplace line breaks with spaces
Select Space to turn multiple text lines into one space-separated line. This is useful for text copied from PDFs, logs, emails, or spreadsheets.
Common string separators
| Separator | Common use |
|---|---|
| Space | Natural-language text and removing hard line breaks |
| Comma | Compact value lists |
| Comma + Space | Readable lists of names, IDs, or keywords |
| Semicolon | Lists whose values may contain commas |
| Pipe | Logs, configuration values, and custom data |
| Tab | Tab-separated text |
| New Line | Rebuild lines after trimming or removing empty items |
| None | Direct string concatenation |
| Custom | Words or symbols such as and or / |
Custom separators are inserted literally. Typing \n inserts a backslash and the letter n; select New Line when you need an actual line break.
Empty lines and whitespace
Ignore empty lines prevents blank items from creating repeated separators. Trim whitespace removes spaces and Tabs from the beginning and end of each line before joining.
Both options are enabled by default. Turn them off when empty items or surrounding whitespace are meaningful parts of your input.
Join vs concatenate strings
| Join | Concatenate |
|---|---|
| Usually combines a list of strings | Often combines two or a few strings |
| Commonly inserts a chosen separator | Commonly places values directly together |
| Useful for lines, columns, and arrays | Common in programming expressions |
These are practical distinctions rather than absolute definitions. This tool supports both: choose a separator to join items, or choose None to concatenate them directly.
Need the reverse operation? Use the String Splitter to separate one string into multiple items.
Is a comma-joined string valid CSV?
Not necessarily. Joining values with commas creates a simple comma-separated list, but valid CSV must quote or escape fields that contain commas, quotes, or line breaks. Use a dedicated CSV tool for structured table data.
String Joiner FAQ
How do I join strings without spaces?
Select None to combine every item without inserting a separator.
Can I use a custom separator?
Yes. Select Custom, then enter any single character or multi-character text. The value is inserted exactly as entered.
Can empty lines be ignored?
Yes. Ignore empty lines is enabled by default so blank lines do not create repeated separators.
Does the tool add a separator after the last item?
No. The separator is inserted only between items. If you keep empty lines, an empty final item can make the result end with the selected separator.
Can I join text with a new line or Tab?
Yes. Select New Line or Tab from the separator list.
Is my text uploaded?
No. The input and output are processed locally in your browser and are not uploaded or stored by Bitty Coder.