Legacy Stable Diffusion WebUI — Summer Update ☀️

A minimalistic, JavaScript-free web interface for Stable Diffusion, designed for compatibility with legacy web browsers like Internet Explorer 4, Netscape 4.x, and even Classilla on Mac OS 9.
Built for long-term access to AI image generation using the AUTOMATIC1111 API — from modern GPUs to vintage clients.

---

🆕 Summer 2025 Update Highlights

• 🗂 File structure cleanup – Generation, prompt saving, and UI now fully separated for better maintainability.
• ⏳ True loading screen – loading.php now displays a loading message before generation starts.
• 💾 "Save Prompt" moved to result page – Save your prompt right after generation from result.php.
• 📉 Improved compression – Lowered ImageMagick quality to 75 (from 85) for 90–93% file size reduction.
• ✅ Default sampler set to Euler a, which works especially well with Illustrious XL (the recommended model).
• 🧼 Overall code quality and parameter consistency improved.

---

🔧 Features

• No JavaScript — 100% HTML 4.01 and PHP
• Ultra-lightweight for slow or vintage clients
• LORA model support via [name:weight] syntax
• Prompt saving and loading via saved-prompts.json
• Server-side PNG ➜ JPG conversion with ImageMagick
• Compatible with AUTOMATIC1111 Stable Diffusion WebUI
• Configurable generation settings:
  • Image size
  • CFG scale
  • Steps
  • Sampler method
  • Negative prompt support

---

🌐 Browser Compatibility

Tested on:

• ✅ Internet Explorer 4–6 (Windows 95–2000)
• ✅ Netscape 4.x
• ✅ Classilla (Mac OS 9)
• ✅ Firefox ESR 102+ (modern systems)

---

📦 Requirements

• Back-end:
  AUTOMATIC1111 Stable Diffusion WebUI running with --api
  https://github.com/AUTOMATIC1111/stable-diffusion-webui

• Front-end Server:
  Linux server with:

  • PHP 8+
  • ImageMagick
  • cURL
  • Any web server (Apache, nginx, or FrankenPHP)

• Client:
  Any browser capable of submitting forms and rendering HTML 4.01
  (Yes, it really works on Windows NT 4.0)

---

🧪 Installation

1. Start AUTOMATIC1111's WebUI with --api
2. Install PHP and ImageMagick on your web server
3. Place index.php, loading.php, generate.php, and result.php in your web directory
4. Ensure write permissions for:
   • saved-prompts.json
   • Your web server's root directory containing the phpsd files, this is where images will be stored
5. Access index.php from a browser and start generating!

---

🧭 Usage Guide

1. Open index.php
2. Type your prompt and negative prompt (optional)
3. Adjust generation parameters
4. Submit ➜ loading screen ➜ image result
5. Save your favorite prompts directly from result.php

---

🧠 LORA Support

Use the syntax:

[lora-name:weight]

Example:

a high-detail wizard portrait [wizard-style:0.8]

Weight values typically range from 0.1 to 1.0

---

📸 Image Processing Notes

• Generated PNGs are automatically converted to optimized JPGs

• ImageMagick runs with:

  -quality 75 -strip -interlace Plane -gaussian-blur 0.05 -sampling-factor 4:2:0
  

• Resulting file sizes reduced by ~90–93%, ideal for slow connections and legacy hardware

---

🧭 System Architecture

Below is a flowchart diagram representing the separation of concerns between the legacy client and the backend server during prompt submission and image generation.

---

🖥️ Screenshots

Running on Windows 2000 SP2 with IE 5 — Illustrious XL Output (June 22, 2025 Summer Update)

This image was generated using Euler a sampler and the Illustrious XL model, processed entirely through the phpsd legacy frontend. Displayed here in Internet Explorer 5 on Windows 2000 SP2.

Running on Mac OS 9 + Classilla

Firefox ESR 115 on Debian 12

---

🖼️ Legacy Wallpaper Output

Don’t just generate — decorate.

All generated images are:

• Optimized for ultra-low size (JPG @ quality 75)
• CRT-safe resolution options
• Perfect for Retro PC wallpapers

Whether you’re browsing from Classilla or setting your ThinkPad T21’s background, phpsd delivers.

🤝 Contributing

Pull requests, forks, and retro tweaks welcome! Feel free to adapt the UI for even older setups or customize layouts per browser profile.

---

📜 License

MIT License

---

🧠 Credits

• Front-end & optimization by markmental
• Powered by AUTOMATIC1111’s Stable Diffusion WebUI

---