Kotlin linter in spirit of standard/standard (JavaScript) and gofmt (Go).

Key features

• No configuration required
• Built-in Rule sets
• Built-in formatter
• .editorconfig support
• Several built-in reporters: plain, json, html and checkstyle
• Executable jar and native binaries
• Allows extension with custom rule sets and reporters

Quick start

Follow steps below for a quick start with latest ktlint release.

• Step 1: Install with brew

  brew install ktlint
  

  See download and verification from GitHub for native executables and the executable JAR, or other package managers for alternative ways of installing ktlint. Or, use one of the integrations like maven and gradle plugins.

• Step 2: Lint and format your code
  All files with extension .kt and .kts in the current directory and below will be scanned. Problems will be fixed automatically when possible.

  ktlint --format
  # or
  ktlint -F
  

  See cli usage for a more extensive description on using ktlint.

Documentation

User guide

Legal

This project is no longer affiliated with Pinterest and is not affiliated with nor endorsed by JetBrains. All code, unless specified otherwise, is licensed under the MIT license.
Copyright (c) 2026 Ktlint
Copyright (c) 2019-2026 Pinterest, Inc.
Copyright (c) 2016-2019 Stanley Shyiko.