서버 업로드가 전혀 없는 30개 이상의 무료 웹 도구를 만들었습니다 (100% 클라이언트 측)

Most online utility sites (PDF converters, image optimizers, file format converters) force you to do two things I really dislike:

1. Upload private documents (contracts, invoices, ID cards, tax receipts) to unknown third-party cloud servers.
2. Hit a paywall or forced registration after just 2 basic conversions.

So I decided to build MiniTools (https://getminitools.com) — a suite of 30+ web tools designed with a strict Zero-Server Client-Side architecture.

🔒 How it Works Under the Hood

Instead of sending your files across the internet to a backend worker, MiniTools performs every operation directly inside your browser memory:

• PDF Manipulation: Merging, splitting, rotating, and compressing PDF files runs locally using pdf-lib and modern WebAssembly.
• Image Optimization: Binary-search canvas compression algorithms that reduce photos to exact file size limits (e.g. strict 30KB / 50KB limits required for government and visa portals).
• Fast Format Converters: HEIC to JPG, WebP to PNG/JPG, PNG to JPG without touching a server.
• Business & Math Calculators: Multi-country VAT/Tax breakdown, business days counter (excluding weekends), rule of three proportions, and percentage calculators.
• PWA & Offline Ready: Service worker caching ensures that once loaded, you can use these tools even on an airplane with zero internet connection.

🛠️ The Tool Suite

You can explore the full collection here: https://getminitools.com

• 📄 PDF Suite: Merge PDF, Compress PDF, Split PDF, Rotate PDF, PDF to Word (.docx), PDF to JPG.
• 🖼️ Image Suite: Image Compressor, Compress to 20KB/30KB/50KB, Circular Avatar Crop, Image Resizer, HEIC to JPG, WebP Converter.
• 🔢 Calculators: VAT/Tax Calculator, Working Days Calculator, Rule of Three, Percentage & Discount Calculators, Age Calculator, Currency Converter.
• 🛠️ Dev Utilities: Text Diff Checker, JSON Formatter, Base64 Encoder/Decoder, Unix Timestamp, Password Generator, QR Code Generator.

🌍 Multilingual & Open

The platform is fully translated and accessible in 6 languages (English, Spanish, Portuguese, French, German, and Italian).

I’d love to hear your feedback, bug reports, and suggestions for new tools to add! 🚀