Ultimate Converter
Web Application
FastAPI+Jinja2
What is it?
Ultimate Converter is a lightweight web tool built for designers and developers who need fast, reliable file conversions. Whether you’re working with images, documents, or vector graphics, it delivers instant results right in the browser.
The interface is simple: drag, drop, convert. Files are processed quickly, with accurate output that preserves quality. From PNG to SVG, PDF to DOCX, or other common formats, Ultimate Converter streamlines a task that usually requires bulky desktop software.
Backend Stack
Core Framework
- FastAPI
- Python
- Uvicorn
Task Processing
- Redis - In-memory data store for job queuing
- RQ (Redis Queue) - Background job processing
- Asyncio - Python's async/await for concurrent operations
Document Processing Libraries
- PyPDF2/PyMuPDF - PDF manipulation and processing
- Pillow (PIL) - Image processing and conversion
- LibreOffice - Office document conversion (Word/Excel/PowerPoint → PDF)
- Ghostscript - PDF optimization and PDF/A conversion
- OCRmyPDF/Tesseract - Optical Character Recognition
- Pandoc - Document format conversion
Web Browser Automation
- Playwright - Browser automation for web-to-PDF conversion
- Chromium - Headless browser for pixel-perfect rendering
Frontend Stack
Templating & UI
- Jinja2 - Server-side templating engine
- Tailwind CSS - Utility-first CSS framework
- Custom CSS (modern.css) - Design system with CSS custom properties
- Vanilla JavaScript - No framework dependencies, modern ES2023+ features
Design System
- CSS Custom Properties - Design tokens for consistent styling
- Component-based architecture - Reusable UI components
- Responsive design - Mobile-first approach
- Progressive enhancement - Works without JavaScript
Infrastructure & DevOps
Containerization
- Docker - Containerization platform
- Docker Compose - Multi-container orchestration
- Multi-stage builds - Separate web and worker containers
Development Tools
- Poetry/pip - Python dependency management
- pyproject.toml - Modern Python project configuration
- Black - Code formatting
- Ruff - Fast Python linting
- MyPy - Static type checking
- Pytest - Testing framework
Storage & Configuration
- Environment variables - Configuration management
- File system storage - Local file handling
- Makefile - Build automation
Key Architecture Patterns
Design Patterns
- Template inheritance - Consistent page layouts
- Component composition - Reusable UI elements
- Tool registry pattern - Modular tool registration
- Job queue pattern - Background processing
- Dependency injection - Testable architecture
Modern Web Standards
- Progressive Web App features - Manifest, service worker ready
- Semantic HTML - Accessibility and SEO
- Modern CSS Grid/Flexbox - Layout systems
- Web APIs - Camera API, File API, Clipboard API
