Last Updated on August 23, 2026
ktfmt is a program that pretty-prints (formats) Kotlin code, based on google-java-format.
ktfmt uses google-java-format’s underlying engine, and as such, many items on google-java-format’s FAQ apply to ktfmt as well. ktfmt ignores most existing formatting. It respects existing newlines in some places, but in general, its output is deterministic and is independent of the input code. ktfmt exposes no configuration options that govern formatting behavior.
This is free and open source software.
Website: github.com/Kotlin/ktfmt
Support:
Developer: Facebook
License: Apache License 2.0
ktfmt is written in Kotlin. Learn Kotlin with our recommended free books and free tutorials.
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Related Software
| Kotlin Code Formatters | |
|---|---|
| ktlint | Kotlin linter with built-in formatter |
| Spotless | Keeps codebases pristine with automated formatting checks |
| ktfmt | Pretty-prints (formats) Kotlin code |
| ktlint-gradle | Runs ktlint from Gradle to enforce Kotlin style rules |
| Kotlinter Gradle | Plugin for linting and formatting |
| ktlint-gradle-plugin | Brings Kotlin linting and formatting checks into Gradle projects |
| ktfmt-gradle | Adds ktfmt formatting to Gradle builds with minimal fuss. |
| Kotlin Formatter | Formats Kotlin source with a simple, consistent command-line tool |
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