How to use this developer tool
- Paste Kotlin source code.
- Choose a formatting style and indentation size.
- Select cleanup options.
- Format and review the changed-line summary.
#179 · Programming Language Tools Developer Tool
Kotlin Formatter
Format Kotlin source with conservative indentation, spacing, blank-line cleanup, and changed-line reporting while preserving common strings, raw strings, and comments.
Developer Input
Browser-based processingspaces
Ad space
What this developer tool does
The formatter applies browser-based Kotlin style normalization and avoids semantic changes. It is not a replacement for ktlint or IntelliJ formatting.
Protect strings and comments → normalize whitespace and braces → indent by block depth → compare lines → report formatting confidence.
Run ktlint or the IDE formatter before committing, especially for complex lambdas, chained calls, annotations, and multiline strings.
Example
The page loads a working Kotlin Formatter example. Run the tool to compare the sample input with the generated output and status summary.
Tips for better output
- Start with valid, isolated code or data.
- Review heuristic and inferred results manually.
- Use the official compiler, formatter, linter, or IDE before production use.
FAQ
How do I format Kotlin code online?
Paste Kotlin code, choose the formatting options, and run the formatter.
Does this formatter preserve Kotlin raw strings and templates?
It uses conservative string protection, but complex multiline content should still be reviewed.
Can this replace ktlint or IntelliJ formatting?
No. It is a browser-based formatting aid and final project formatting should use the official workflow.
Can this browser tool replace the official compiler or IDE inspection?
No. It performs browser-based formatting, conversion, structural parsing, or heuristic analysis. Always verify production code with the official toolchain.
Does this tool upload my source code?
No processing is implemented by the page itself in your browser. Review your hosting and analytics configuration separately if you add external services.
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Tool coverage
| Module | Coverage |
|---|---|
| Formatting | Indentation and whitespace |
| Protection | Comments and common strings |
| Verification | Use ktlint for final style |