CodeUtility
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HTML to Slim Converter

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

Tags: convert code erb html rails slim template converter

🚀 396,309 total conversions (95 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
Python C++ C#
1 solved
View solutions (1)
Easy

Rectangle Perimeter

Compute the perimeter of a rectangle from its sides.

You'll learn ArithmeticReturn values
BeginnerLearning-pathVariables
Python C++ C#
1 solved
View solutions (1)
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
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
Python C++ C#
0 solved
No solutions yet

What is This Tool?

This free online converter lets you instantly transform HTML and ERB (Embedded Ruby) templates into clean, minimal Slim code. It’s a great choice for Ruby on Rails developers looking to modernize and simplify their views.

How to Use

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

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

Why Slim?

Slim is a fast, lightweight Ruby templating engine that uses indentation instead of HTML tags. It's widely used in Rails applications for its clean syntax and improved readability.

Benefits of Slim include:

  • Minimal and whitespace-driven syntax
  • Faster development with fewer characters to type
  • Improved maintainability for complex views

Slim is powered by Temple and Tilt. It's a popular choice among Rails developers who want beautiful, clean views.

Learn more at the official Slim website.

Slim Syntax Example


doctype html
html
  head
    title Slim Example
    meta name="keywords" content="template language"
    meta name="author" content=author
    javascript:
      alert('Slim supports embedded javascript!')

  body
    h1 Markup examples

    #content
      p This example shows what a basic Slim file looks like.

      == yield

      - unless items.empty?
        table
          - items.each do |item|
            tr
              td.name = item.name
              td.price = item.price
      - else
        p
          | No items found. Please add inventory.
    div id="footer"
      = render 'footer'
      | © #{year} #{author}

HTML+ERB vs Slim 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>

Slim


| 
html
  head
    meta[charset="utf-8"]
  body
    h1 Blogg
    p
      | Time:
      = Time.now
    - Post.all.each do |post|
      article
        h2 = post.title
        div = post.body