Legacy Stable Diffusion WebUI

A minimalistic, JavaScript-free web interface, front-end and processing server for Stable Diffusion, designed specifically for being accessed by legacy systems and browsers as clients. This interface relies on the API from AUTOMATIC1111's Stable Diffusion WebUI.

Features

• No JavaScript dependencies
• Lightweight and fast loading
• Support for LORA models using square bracket syntax
• Image optimization with automatic PNG to JPG conversion
• Prompt saving and loading functionality
• Full configurability of key generation parameters:
  • Image dimensions
  • Sampling steps
  • CFG Scale
  • Choice of sampling methods
  • Negative Prompt Support (1-19-2025 Update)

Browser Compatibility

• index.php: Tested working on IE4+, Netscape 4.x and above browsers (HTML 4 compliant)

Requirements

• Linux server with a suitable GPU; running a model in AUTOMATIC1111's Stable Diffusion WebUI https://github.com/AUTOMATIC1111/stable-diffusion-webui with API access (image generation back-end)
• Externally accessible Linux server running PHP 8+ to run the PHP front-end (Tested on frankenphp running on Debian 12, should also run with traditional PHP setups with apache/nginx, can run on the same server as the back-end)
• Web server (Apache, nginx, etc.)
• ImageMagick for image optimization
• Curl
• Client machine to access the front-end via web browser

Installation

1. Ensure you have AUTOMATIC1111's Stable Diffusion WebUI running with the --api flag
2. Install PHP and ImageMagick on your system
3. Copy both index.php to your web server directory
4. Ensure the directory is writable by the web server for saved prompts and generated images
5. Access through your web browser:
   • Use index.php for HTML 4.01+ compatible browsers

Usage

1. Enter your prompt and negative prompt if applicable in the text area
2. Configure generation parameters as needed
3. Click "Generate Image" to create your image
4. Save frequently used prompts server-side using the "Save Prompt" feature
5. Load saved prompts from the dropdown menu

LORA Usage

To use LORA models, include them in your prompt using square brackets: [lora-name:weight]

Example: a beautiful landscape by [my-artist-lora:0.8]

Notes

• Images are automatically optimized and converted from PNG to JPG for faster loading
• The interface works without any client-side scripting
• All processing is done server-side
• Compatible with browsers from the late 1990s to now

Screenshots

Running on Windows NT 4.0 With IE 4

Running on Firefox ESR 115

Contributing

Contributions are welcome! Please feel free to submit a Pull Request or fork.

License

This project is MIT licensed.

Credits

Built to work with AUTOMATIC1111's Stable Diffusion WebUI API: https://github.com/AUTOMATIC1111/stable-diffusion-webui