Ruby / Lua / Perl Formatter — Reindent Three Languages

How to use

1. 1 Pick the language: Ruby, Lua, or Perl.
2. 2 Paste source code.
3. 3 Tune indent size — 2 spaces is idiomatic for Ruby, 2 or 4 for Lua and Perl.
4. 4 Copy or download the result.

Why use this tool

• One tool covers three syntactically similar block-end-keyword languages.
• Per-language openers: <code class="rounded bg-slate-100 px-1 text-xs dark:bg-slate-800">do/end</code> for Ruby, <code class="rounded bg-slate-100 px-1 text-xs dark:bg-slate-800">function/end</code> for Lua, braces for Perl.
• Pure client-side — your code never leaves the browser.
• For canonical output use RuboCop (Ruby), StyLua (Lua), or perltidy (Perl) locally.

Frequently asked questions

What is Ruby / Lua / Perl Formatter?

A Ruby / Lua / Perl Formatter is a tool that reindents Ruby, Lua, or Perl source code in the browser. It combines three keyword-driven languages into one formatter, applying consistent indentation based on each language's block structure while running entirely client-side.

Features

Example

class Foo
def bar(x)
return x*2
end
end

class Foo
  def bar(x)
    return x*2
  end
end

Common use cases

1. 1

   Fix pasted scripts

   Repair indentation on Ruby, Lua, or Perl copied from a chat or PDF.

2. 2

   Standardize nesting

   Apply consistent 2-space nesting across a script.

3. 3

   Quick readability pass

   Tidy layout before sharing without a full linter setup.

References

• The Ruby Style Guide — rubystyle.guide
• Lua 5.4 Reference Manual — Lua.org
• perlstyle — Perl style guide — perldoc.perl.org

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