ToolBox

A full-stack web application offering a suite of productivity and utility tools for image processing, file manipulation, encoding/decoding, and media downloading. Built with a focus on security, performance, and user experience.

Demo: toolbox.pablocostas.dev | Code: GitHub

What it does

ToolBox provides a collection of browser-based tools to handle common file processing tasks without installing desktop software. Users can compress, convert, blur, and resize images; merge PDFs; generate QR codes; download YouTube videos; and encode/decode text in various formats. Authenticated users access premium features such as 4K video downloads.

The backend implements security measures including HMAC-signed tokens, SSRF prevention, path traversal protection, rate limiting, and command injection hardening. A Redis-based job queue handles asynchronous processing with real-time progress streaming to the client.

Tech stack

• Frontend: Astro 5, React, TypeScript, TailwindCSS
• Backend: GO, Gin
• Authentication: Clerk
• Infrastructure: Docker, Nginx, Cloudflare Tunnel, Ansible
• Security: SlowAPI rate limiting, HMAC-SHA256 tokens, input sanitization

Key features

• Image compression, conversion, blur, and resize with real-time preview
• PDF merging, QR code generation, and YouTube video downloading
• Text encoding/decoding (Base64, Hex, URL) and hash generation (MD5, SHA-256)
• Secure authentication with role-based access control for premium features
• Asynchronous job queue with WebSocket-based progress streaming
• Rate limiting, CORS hardening, and DoS protection