About

Hi, I am Alan …?a full-stack developer with over a decade of experience in web development. yoolbox is a side project I built and maintain in my spare time. The idea came from a simple frustration: I kept hopping between different online tools throughout my workday — some required registration, others had file size limits, and many just didn't work reliably. So I decided to build my own.

Today, yoolbox offers 10 free online tools covering common development and daily needs:

Word Counter — Count words, characters, and paragraphs in mixed Chinese/English text
Image Compressor — Compress images in your browser, nothing uploaded to any server
PDF Merger — Combine multiple PDF files into one document
QR Code Generator — Turn URLs and text into QR codes instantly
Unit Converter — Convert length, weight, temperature, and more
JSON Formatter — Format, validate, and minify JSON data
Password Generator — Create strong, random passwords
Timestamp Converter — Convert Unix timestamps to readable dates and back
Base64 Encoder/Decoder — Encode and decode Base64 data
Regex Tester — Test regular expressions online

You won't find flashy marketing copy or annoying sign-up popups here. Each tool does one thing and does it well. All core features are completely free — no registration, no login required.

The site is fully bilingual (Chinese and English). Everything is built with PHP on the backend and vanilla JavaScript on the frontend — no heavy frameworks, no unnecessary bloat.

If you have suggestions or find a bug, please let me know. I read every piece of feedback.