The output is not what I expected.
Recheck the input, selected options and the limitation notes below; preserve the original before trying a destructive cleanup. No automatic syntax escaping or validation is performed.
String Builder
Turn one snippet per line into a single string with the separator, prefix and suffix you choose.
What this tool does
String Builder joins distinct input lines into one assembled string. It is useful for quoted lists, test fixtures and formatted labels, but it does not understand or automatically escape SQL, JSON, CSV or programming-language syntax. No automatic syntax escaping or validation is performed.
Paste one item per line, set the join pattern and copy the assembled string.
Maximum 500,000 characters: 16 / 500000
Result updated
How to use it
Paste one item or snippet on each line.
Set the separator and add an optional prefix or suffix.
Inspect the assembled output for required quoting or escaping, then copy it.
Key features
- One-line-per-item input.
- Configurable separator between items.
- Optional wrapper text before and after the full result.
Practical use cases
- Building comma-separated or pipe-separated lists.
- Wrapping identifiers for documentation or test fixtures.
- Preparing a compact string from a vertical list.
Limitations and important notes
- No automatic syntax escaping or validation is performed.
- Input is capped at 500,000 characters to limit browser memory use.
- Blank lines may affect the result and should be cleaned when unwanted.
Troubleshooting
The page becomes slow with a large input or repeat count.
Reduce the input, split the operation into smaller batches and close other memory-heavy tabs. Keep an original copy before retrying.
The result changes after I paste it elsewhere.
Test the destination app, font and character encoding. Some apps normalize whitespace or render Unicode differently.
Frequently asked questions
How do I join lines with a separator?
String Builder joins distinct input lines into one assembled string. It is useful for quoted lists, test fixtures and formatted labels, but it does not understand or automatically escape SQL, JSON, CSV or programming-language syntax.
Can I add a prefix and suffix?
Yes. The prefix and suffix wrap the complete assembled result.
Does it escape SQL, JSON or code automatically?
No. Review and escape the output according to the destination syntax, or use parameterised APIs where applicable.
What are the limitations?
No automatic syntax escaping or validation is performed. Input is capped at 500,000 characters to limit browser memory use. Blank lines may affect the result and should be cleaned when unwanted.
Related tools
Use the tool
Paste one item per line, set the join pattern and copy the assembled string.