About ToolsStack

What is ToolsStack?

ToolsStack is a free collection of 21 online developer tools designed for speed, privacy, and simplicity. Every tool runs entirely in your browser — no data is ever uploaded to any server, no account is required, and all tools are completely free with no usage limits.

The project was created to solve a common problem: many online developer tools require uploading your data to a server. Whether it is formatting JSON, decoding a JWT, or generating a hash, your data often contains sensitive information. ToolsStack keeps everything on your device.

Our Privacy-First Approach

ToolsStack is built on a core principle: your data belongs to you. Every tool uses client-side JavaScript to process data directly in your browser. You can verify this at any time:

Open your browser's Developer Tools (F12)
Go to the Network tab
Use any ToolsStack tool
You will see zero outbound data requests

In fact, after the initial page load, you can disconnect your internet entirely — every tool will continue to work offline.

Tool Categories

Developer Tools

JSON Formatter, JSON to CSV, Base64 Encode/Decode, URL Encoder/Decoder, HTML Entity Converter, JWT Decoder, SQL Formatter, Regex Tester, Hash Generator, PDF Compressor, PDF to JPG

Generators

UUID Generator, Password Generator, Lorem Ipsum Generator

Text Tools

Word Counter, Case Converter, Diff Checker, Markdown Preview

Image & Color

Color Picker, QR Code Generator, GIF Maker

Technology

ToolsStack is a static website built with vanilla HTML, CSS, and JavaScript. It uses Tailwind CSS for styling and industry-standard open-source libraries for specific tool functionality:

marked.js — Markdown rendering
pdf-lib — PDF manipulation
pdfjs-dist — PDF rendering
qrcodejs — QR code generation
gif.js — GIF encoding
Web Crypto API — Cryptographic hashing

The site is hosted on Cloudflare Pages, a global edge network that serves content from data centers close to you for maximum speed.