HTML to Haml Converter

Transform HTML/ERB into Haml with ease. Built for Rails developers who value clean, structured code.

Tags: convert code erb haml html rails template converter

🚀 359,329 total conversions (8 this month)

Practice Python with coding challenges

Solve hands-on problems right in this editor: run the sample tests, submit, and get an AI code review.

All Python challenges
Easy

Average of Three

Average three whole numbers.

You'll learn ArithmeticDivision
BeginnerLearning-pathVariables
Easy

Rectangle Perimeter

Compute the perimeter of a rectangle from its sides.

You'll learn ArithmeticReturn values
BeginnerLearning-pathVariables
Medium

One Generation of a Genetic Algorithm

Breed the next generation of bit strings with tournament selection, single-point crossover and mutation.

You'll learn Genetic algorithmsEvolutionary search
OptimizationSimulationai
No solutions yet
Easy

Epsilon-Greedy Multi-Armed Bandit

Balance exploration and exploitation on a multi-armed bandit with epsilon-greedy action selection.

You'll learn Explore vs exploitBandits
Reinforcement learningaimachine learning
No solutions yet
Easy

Markov Chain State Distribution

Propagate a probability distribution through a Markov chain's transition matrix for a number of steps.

You'll learn Markov chainsProbability
Simulationaimath
No solutions yet
Medium

Value Iteration

Compute how valuable each state of a Markov decision process is by repeatedly applying the Bellman optimality update.

You'll learn Bellman equationMDPs
Reinforcement learningaimachine learning
No solutions yet
Medium

Q-Learning Updates

Apply the Q-learning update to a stream of experiences and watch rewards flow back to earlier states.

You'll learn Q-learningDiscounted rewards
Reinforcement learningaimachine learning
No solutions yet
Medium

Alpha-Beta Pruning

Evaluate a game tree with minimax and alpha-beta pruning, and count how many leaves the search really looks at.

You'll learn Alpha-beta pruningGame search
RecursionTreesai
No solutions yet
Medium

Minimax Tic-Tac-Toe

Pick the perfect tic-tac-toe move by searching the whole game tree with minimax.

You'll learn MinimaxGame trees
Recursionai
No solutions yet
Medium

A* Search on a Weighted Grid

Find the cheapest path across a grid of terrain costs with A*, the search algorithm behind game and robot pathfinding.

You'll learn A* searchHeuristics
GraphsGridsShortest-pathai
No solutions yet
Medium

Temperature and Top-K Sampling

Choose the next token like a language model does: keep the top k logits, apply temperature, and sample.

You'll learn Text generationSampling
aimachine learning
No solutions yet
Hard

Multi-Head Self-Attention

Project the input into queries, keys and values, run attention in several heads in parallel, and combine them.

You'll learn Multi-head attentionMatrix projections
aimachine learning
No solutions yet

What is This Tool?

This free online converter helps you instantly convert HTML and ERB (Embedded Ruby) templates into clean, readable Haml code. It’s ideal for Ruby on Rails developers who want to simplify and modernize their views.

How to Use

  1. Paste or type your HTML+ERB code into the editor.
  2. Click Convert to generate Haml.
  3. Download, copy, or share the Haml result instantly.

You can also sign in with Google or GitHub to save your conversion history and download files later.

Why Haml?

Haml (HTML Abstraction Markup Language) is a whitespace-sensitive templating engine for Ruby, commonly used in Rails. It replaces inline HTML with clean, indented syntax that’s easier to read and maintain.

Benefits of Haml include:

  • Cleaner and shorter syntax compared to ERB
  • Improved readability and maintainability
  • Faster front-end templating for Rails developers

Haml is used by many Ruby shops and developers for rapid Rails development, including Unspace Interactive.

Learn more at the official Haml website.

Haml Syntax Example


%section.container
  %h1= post.title
  %h2= post.subtitle
  .content
    = post.content

    

HTML+ERB vs Haml Example

HTML+ERB


<!doctype html>
<html>
  <head>
    <meta charset="utf-8"/>
  </head>
  <body>
    <h1>Blogg</h1>
    <p>Time: <%%= Time.now %%></p>
    <%% Post.all.each do |post| %%>
      <article>
        <h2><%%= post.title %%></h2>
        <div><%%= post.body %%></div>
      </article>
    <%% end %%>
  </body>
</html>

Haml


!!!
%html
  %head
    %meta{ content: "text/html; charset=UTF-8", "http-equiv": "Content-Type" }/
    %meta{ charset: "utf-8" }/
  %body
    %h1 Blogg
    %p
      Time:
      \#{Time.now}
    - Post.all.each do |post|
      %article
        %h2= post.title
        %div= post.body