browserutils

Kotlin Formatter

Beautify and format Kotlin code

Kotlin Formatter is a free online tool from BrowserUtils that beautify and format kotlin code. It runs entirely in your browser — your data never leaves your device. No account required.

How to use Kotlin Formatter

  1. 1 Paste or type your input into the editor above.
  2. 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
  3. 3 Copy the result with one click or continue editing your input.

About Kotlin Formatter

Free online Kotlin formatter and beautifier. Format Kotlin code with proper indentation and consistent spacing for readable, clean code. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.

Kotlin Formatter specs

Runtime
100% client-side (browser)
Cost
Free — no account, no rate limits, no usage caps
Browser support
Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
Part of
299 developer tools on BrowserUtils (100% client-side)

Questions

What indentation does the Kotlin formatter use?
The formatter uses 4-space indentation following Kotlin coding conventions, with same-line opening braces.
Does it handle Kotlin-specific features?
Yes, the formatter handles data classes, companion objects, when expressions, extension functions, null-safe operators, and other Kotlin-specific syntax.
Can I format Kotlin coroutine code with this tool?
Yes, coroutine-related syntax like suspend functions, launch, async, and flow builders are all handled correctly by the formatter.
How does this compare to ktfmt or ktlint?
This tool gives you instant formatting in the browser with no setup. For project-wide enforcement with custom rules, ktlint or ktfmt integrated into your build pipeline offers more control.
Embed this tool

Copy this code to embed the tool on your website. Adjust the height to fit your layout.

<iframe src="https://www.browserutils.dev/embed/kotlin-formatter" width="100%" height="500" frameborder="0" title="Kotlin Formatter"></iframe>

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