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Ruby Beautifier

Paste compact Ruby source and indent it based on Ruby block keywords like def, class, do, and end.

Last updated: May 29, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is Ruby Beautifier?

Ruby Beautifier formats Ruby snippets so classes, methods, conditionals, loops, and blocks are easy to read. Like Lua, Ruby uses keywords to delimit blocks — def, class, module, do, if, unless, while, until, and begin open blocks, while end closes them. The formatter indents based on these keywords and handles mid-block keywords like else, elsif, when, rescue, and ensure by printing them at one level below the body. It is intentionally lightweight and focuses on indentation and line breaks.

How to Use Ruby Beautifier

1

Paste Ruby source code.

2

Choose indentation style.

3

Click Format.

4

Review the beautified Ruby output.

5

Copy or download the .rb file.

Common Use Cases

  • Cleaning Ruby examples before adding to a README or wiki.
  • Reading compact code copied from a forum, gist, or legacy file.
  • Indenting Rails model or controller snippets for review.
  • Preparing Ruby samples for documentation or screenshots.

Example Input and Output

A flat Ruby class is expanded with block indentation.

Compact Ruby
class Greeter
def initialize(name)
@name=name
end
def greet
puts "Hello, #{@name}"
end
end
Beautified Ruby
class Greeter
  def initialize(name)
    @name = name
  end
  def greet
    puts "Hello, #{@name}"
  end
end

Privacy

Ruby code is formatted locally in the browser and is not uploaded.

Frequently Asked Questions

Does this validate or run Ruby?

No. It formats text for readability only. Use ruby or irb to run or check your code.

How does it know where to indent?

It indents after block-opening keywords like def, class, do, and if, and dedents at end. Mid-block keywords like else and rescue are printed one level below the block body.

Will it change my program behavior?

No. It only adjusts whitespace and line breaks.

Is my code uploaded anywhere?

No. Formatting runs entirely in your browser.

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