I Got Tired of Bloated Dev Tools, So I Built 15 Fast, 100% Client-Side Micro-Tools

Yayat Ruhiat — Sat, 29 Aug 2026 04:11:46 +0000

Every developer has been there: you need to quickly decode a Hex string, format a messy JSON payload, inspect an IPv4 subnet, or convert an image to Base64.
You open Google, click the first link, and immediately get hit with:

5 intrusive banner ads and cookie popups
A spinner while your data gets uploaded to some unknown backend server
A paywall or sign-up prompt after 3 conversions I got tired of this experience, so I decided to build MicroTools — a free, lightweight suite of 15+ developer utilities that run 100% inside your browser. --- ## ⚡ Why 100% Client-Side? When dealing with API keys, database hashes, QR codes, or network configurations, privacy and latency matter. By processing everything using native browser APIs:
Zero Latency: Conversions happen instantly on keystroke (onChange).
Zero Server Logging: Your data never leaves your machine.

3. Works Offline / Spotty Connections: Once cached via Service Worker/Vite bundle, it runs entirely local.

🛠️ Highlights of What's Inside

Here are a few utilities included in the toolkit:

1. 🖼️ Base64 ↔ Image Converter

Drag & drop any image format (PNG, JPG, WEBP, SVG, AVIF, GIF).
Outputs Data URI, raw Base64, or ready-to-use CSS background-image.
Bidirectional: Paste any Base64 string to immediately preview, inspect dimensions, and download as an image file. ### 2. 🔐 Secure Password & Entropy Generator Instead of using predictable Math.random(), this generator uses the browser's cryptographic Web Crypto API (crypto.getRandomValues) to generate cryptographically strong passwords and passphrases with real-time bit entropy calculation.


javascript
// How we generate truly random cryptographic bytes in the browser:
function getCryptoRandomInt(max) {
  const array = new Uint32Array(1);
  window.crypto.getRandomValues(array);
  return array[0] % max;
}
3. 🔢 Hex ↔ ASCII / UTF-8 Converter
Supports multi-byte UTF-8, emojis, and customizable output delimiters (0x prefix, space, comma, continuous).

javascript
// Native UTF-8 Hex encoding without external dependencies
const textToHex = (text) => {
  const encoder = new TextEncoder();
  const bytes = encoder.encode(text);
  return Array.from(bytes)
    .map((b) => b.toString(16).padStart(2, '0'))
    .join(' ');
};
4. 🌐 IPv4 Subnet Calculator & CIDR Visualizer
Instantly breakdown IP subnets, calculate broadcast addresses, wildcard masks, usable host ranges, and binary bit boundaries.

5. 🏷️ TLV (Tag-Length-Value) Parser
Inspect and decode BER-TLV data structures, EMV smartcard payloads, and EMVCo/QRIS merchant formats.

6. 🤖 AI Prompt Generators
Structured prompt tag builders for Suno & Udio AI (music production), Midjourney & Flux.1 (photography), and Runway Gen-3 / Kling AI (cinematic video physics).

🧰 Tech Stack
Framework: React 18 + Vite (for instant HMR and minimal bundle footprint)
Styling: Tailwind CSS (sleek dark mode)
Icons: Lucide Icons
Deployment: Surge CDN + Cloudflare Edge
🚀 Check It Out & Share Your Feedback!
The project is live at: 👉 https://micro-tools.xyz

What other developer or creator utilities do you frequently find yourself needing? I'd love to hear your suggestions, feature requests, or technical feedback in the comments below! 👇

DEV Community: Yayat Ruhiat

I Got Tired of Bloated Dev Tools, So I Built 15 Fast, 100% Client-Side Micro-Tools

3. Works Offline / Spotty Connections: Once cached via Service Worker/Vite bundle, it runs entirely local.

🛠️ Highlights of What's Inside

1. 🖼️ Base64 ↔ Image Converter