pyobfus Logo

pyobfus

Modern Python Code Obfuscator

PyPI version PyPI downloads Documentation Status

A Python code obfuscator built with AST-based transformations. Supports Python 3.8 through 3.14 (including the latest stable release). Provides reliable name mangling, string encoding, and code protection features.

Features

🆓 Community Edition (Free)

  • Name Obfuscation: Rename variables, functions, and classes to I0, I1, I2...
  • Comment Removal: Strip comments and docstrings
  • String Encoding: Base64 encoding for string literals
  • Multi-file Support: Obfuscate entire projects
  • YAML Configuration: Flexible configuration system
  • Parameter Preservation: Keep function parameter names for keyword arguments

💎 Professional Edition - $45 USD

  • ✨ All Community Features +
  • 🔀 Control Flow Flattening: Transform code structure into state machines
  • 🧩 Dead Code Injection: Inject unreachable code to increase complexity
  • 🔐 AES-256 String Encryption: Military-grade encryption for strings
  • 🛡️ Anti-Debugging Checks: Detect and prevent debugging attempts
  • 📅 License Embedding: Expiration dates, machine binding, run limits
  • ⚡ Configuration Presets: One-command setup (trial, commercial, library)
  • 🔄 Lifetime Updates: All future Pro features included
  • 💻 Up to 3 Devices: Use on multiple machines
  • 📧 Priority Email Support
Buy Now - $45 USD →

📄 More purchase details ↓

Installation

From PyPI (recommended):

pip install pyobfus

From source (for development):

git clone https://github.com/zhurong2020/pyobfus.git
cd pyobfus
pip install -e .

Quick Start

Obfuscate a single file:

pyobfus input.py -o output.py

Obfuscate a directory:

pyobfus src/ -o obfuscated/

With configuration:

pyobfus src/ -o obfuscated/ --config pyobfus.yaml

Example

Before obfuscation:

def calculate_total(price, quantity):
    """Calculate total price."""
    tax_rate = 0.1
    subtotal = price * quantity
    tax = subtotal * tax_rate
    return subtotal + tax

After obfuscation:

def I0(I1, I2):
    I3 = 0.1
    I4 = I1 * I2
    I5 = I4 * I3
    return I4 + I5

Note: Variable names may vary slightly, but functionality is preserved.

Documentation

Community & Support

Purchase Professional Edition

💎 Professional Edition - $45 USD

One-time payment • Lifetime access

What's Included:

🚀 Buy Now - $45 USD

⚡ Instant delivery • 🔒 Secure checkout • 💯 30-day money-back guarantee

Try Before You Buy

Want to test Pro features before purchasing? Use the 5-day free trial:

# Start a free trial (no credit card required)
pyobfus-trial start --email your@email.com

# Quick start with presets
pyobfus src/ -o dist/ --preset commercial

# Or use individual features
pyobfus input.py -o output.py --control-flow --string-encryption --anti-debug --dead-code

# With license restrictions
pyobfus src/ -o dist/ --expire 2025-12-31 --bind-machine

# Check trial status
pyobfus-trial status

The trial includes all Pro features with full functionality for 5 days.

How to Purchase

Step 1: Click “Buy Now” and complete secure checkout (Stripe)

Step 2: Receive your license key via email within minutes

Step 3: Activate your license

pip install --upgrade pyobfus
pyobfus-license register PYOB-XXXX-XXXX-XXXX-XXXX

Activation Guide

Full activation instructions: License Activation Guide

Legal & Policies

By purchasing pyobfus Professional Edition, you agree to our:

Security Note

String Encryption Limitations: AES-256 string encryption is designed as a deterrent against casual reverse engineering, not as cryptographic security. Because obfuscated code must decrypt strings at runtime, the encryption key is embedded in the output. This is a fundamental limitation of all client-side obfuscators.

Recommendation: For sensitive credentials (API keys, passwords), use environment variables or external secret management systems rather than embedding them in code.

See our full README for detailed security guidance.

License

Dual License Model:

Built with Python 3.8-3.14 • AST-based Transformations • Open Source