
TONG YONGJUN
Retired Plumber · Self-Taught Coder · AI Enthusiast
About Me
I spent most of my career working as a plumber — a job that has nothing to do with coding, websites, or image processing. But after retiring, I decided to teach myself programming. Not for career reasons, but because I had a real problem that technology could solve.
Why I Built ZizzleUp
In everyday life, there are countless situations that require uploading images: utility bills, bank checks, monthly statements, proof documents, ID cards. These images contain private information — your address, your account numbers, your name.
Most online image tools work by uploading your files to their servers. Before uploading, I’d always wonder: what happens to my image on their servers? Who can access it? For a long time, the only safe option was to open Photoshop — a heavy, expensive piece of software — just to compress a single image. That felt ridiculous.
So I learned JavaScript, studied browser APIs, and built ZizzleUp. Everything runs locally in your browser. Your images never leave your device. That worry is gone.
My Interests
Beyond image tools, I’m genuinely fascinated by AI — especially in the area of image generation and computer vision. On this blog, I share AI news and developments that I find personally interesting. My goal isn’t to chase trends, but to understand and explain things in plain language.
I believe technology should be accessible to everyone, not just those with computer science degrees. If a retired plumber can build a privacy-focused web tool, there’s no reason anyone should feel intimidated by technology.
Skills & Technologies
JavaScript
HTML5 Canvas
Tesseract.js (OCR)
PDF.js
Web Workers
JSZip
Image Processing
Web Performance
Get in Touch
📧 contact@zizzleup.com
I read every email and try to respond. If you find a bug, have a feature request, or just want to say hello — I’d love to hear from you.