Free Online Python Tutor & Code Visualizer

Visualize Python, JavaScript, Java, and C++ code execution step-by-step with variable tracking.

Powered by Python Tutor

This tool integrates the official Python Tutor by Philip Guo - the world's most popular program visualization tool, used by over 20 million people in 180+ countries. It provides step-by-step visual debugging for Python, JavaScript, Java, C, and C++.

Real code execution
Visual memory diagrams
5 programming languages
AI tutor assistance

Visit pythontutor.com for more information and documentation.

Select Programming Language

Quick Start Examples

Click any example below to load it into the visualizer and see how it executes step-by-step:

Python Tutor Visualizer

- Step-by-step execution

How to Use Python Tutor

Getting Started

  1. Select your programming language above
  2. Click a quick example or write your own code
  3. Click "Visualize Execution" in the visualizer
  4. Use navigation buttons to step through execution
  5. Watch variables and memory change in real-time

Features

  • Visual memory diagrams with objects and pointers
  • Heap and stack visualization
  • Step-by-step code execution
  • AI tutor for help and explanations
  • Share visualizations via URL
  1. 1 Paste Python Code: Input the snippet of Python code you want to analyze.
  2. 2 Visualize Execution: Click "Visualize Execution" to start the step-by-step process.
  3. 3 Trace Changes: Use the navigation controls to step forward/backward, watching how variables, memory, and function calls change. Visualize Python code now!

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