KeyGen
All ToolsClient-Side Utility

Flask SECRET_KEY Generator

Generate secret keys for Flask web applications

Configuration

About Flask SECRET_KEY

  • • SECRET_KEY: Critical for Flask session security
  • • Used to sign session cookies and other security tokens
  • • Must be random and kept secret
  • • Generated as hexadecimal (0-9, a-f)
  • • Store in environment variables (.env)
  • • Different key per environment (dev, staging, production)
  • • Change if key is compromised
  • • Never hardcode in source files

Setup Instructions

1. In app.py or config.py:

import os
from dotenv import load_dotenv

load_dotenv()
app.config['SECRET_KEY'] = os.getenv('FLASK_SECRET_KEY')

2. In .env file:

FLASK_SECRET_KEY=your-generated-key-here

3. Or alternatively in app.py:

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your-generated-key-here'