7 HTML/JS Tools That Work Offline — Open and Use Instantly

Calculator, countdown timer, to-do list, QR generator, password generator, unit converter, and invoice generator. Just open index.html.

Tools That Work Everywhere

All 7 HTML/JS tool packs work by simply opening index.html in any browser. No installation, no server, no internet required.

Multi-Purpose Calculator

Basic, scientific, and unit conversion in one. Full keyboard support.

Countdown Timer

Set any duration. Visual progress ring. Audio alert. Auto-repeat mode.

To-Do List App

Tasks persist in localStorage. Filter by All, Active, Done. Never lose your tasks.

QR Code Generator

Generate from any text or URL. Custom size and colors. Download as PNG. Fully offline.

Password Generator

Crypto-secure. Length 8-64. Toggle character types. Strength meter included.

Unit Converter

6 categories, bidirectional, instant results. Length, Weight, Temperature, Volume, Area, Speed.

Invoice Generator

Professional invoices in the browser. Multiple currencies. Auto-calculate tax. Export to PDF.

Price: 143,400 YFIN each (approx $2.00)

Browse HTML/JS Tool packs at code.yfin.io