About StackUtils
90+ free, browser-based developer tools — built by developers, for developers.
Our Mission
StackUtils was created with a single goal: to provide high-quality, browser-based developer utilities that are fast, secure, and completely free — without paywalls, intrusive ads, or forced sign-ups.
Every tool runs entirely inside your browser. We never send your data to our servers, never log your inputs, and never share anything with third parties. What you type stays on your device.
What We Offer
StackUtils currently provides over 90 tools across 10 categories, covering everything from everyday developer tasks to advanced SEO, design, and data-conversion workflows:
📦 JSON & Data
- ✓ JSON Formatter & Beautifier
- ✓ JSON Viewer
- ✓ JSON Diff
- ✓ JSON to XML
- ✓ JSON to TypeScript
- ✓ JSON Schema Generator
🔐 Encode / Decode
- ✓ Base64 Encoder / Decoder
- ✓ Base64 to Image
- ✓ URL Encoder / Decoder
- ✓ HTML Entities
- ✓ Base32 Encoder
- ✓ ROT13
📝 Text Tools
- ✓ Word Counter
- ✓ Case Converter
- ✓ Text Diff
- ✓ Markdown Preview
- ✓ Markdown to HTML
- ✓ Lorem Ipsum Generator
- ✓ Slug Generator
- ✓ Text to Morse Code
⚙️ Dev Utilities
- ✓ SQL Formatter
- ✓ Regex Tester
- ✓ Cron Builder
- ✓ JWT Decoder
- ✓ JWT Generator
- ✓ Hash Generator
- ✓ UUID Generator
- ✓ Timestamp Converter
🌐 Network & API
- ✓ DNS Lookup
- ✓ HTTP Headers Inspector
- ✓ IP Address Info
- ✓ IP Subnet Calculator
- ✓ cURL to Code Converter
- ✓ GraphQL Query Builder
- ✓ OpenAPI / Swagger Viewer
- ✓ Backlink Checker
🎨 Design & Visual
- ✓ Gradient Generator
- ✓ QR Code Generator
- ✓ Code Screenshot
- ✓ Color Converter
- ✓ Color Palette Generator
- ✓ CSS Shadow Generator
- ✓ Color Contrast Checker
- ✓ SVG to PNG
📁 Files & Office
- ✓ PDF to Word Converter
- ✓ Word to PDF Converter
- ✓ Excel to CSV
- ✓ CSV to Excel
- ✓ CSV to JSON
- ✓ Image Optimizer
- ✓ PDF Compressor
- ✓ Text to PDF
📊 SEO & Marketing
- ✓ Meta Tags Preview
- ✓ SERP Preview
- ✓ Sitemap Generator
- ✓ Keyword Extractor
- ✓ Fake Data Generator
🔒 Security
- ✓ Password Generator
- ✓ Hash Generator (MD5, SHA-1, SHA-256)
- ✓ JWT Decoder
- ✓ JWT Generator
🧮 Calculators & Converters
- ✓ Aspect Ratio Calculator
- ✓ CSS Specificity Calculator
- ✓ Color Opacity Calculator
- ✓ Percentage Calculator
- ✓ Unit Converter
- ✓ Number Base Converter
- ✓ Unicode Inspector
Browse the full list on our home page. New tools are added regularly based on community feedback.
Our Values
🔒 Privacy First
All tool processing happens client-side in your browser. Your data never leaves your device.
⚡ Speed
Built on Next.js for instant page loads and zero-latency tool execution with no server round-trips.
🆓 Always Free
All tools are free to use, always. The site is supported by non-intrusive, clearly labelled ads.
Why StackUtils?
Most developer tool sites are slow, cluttered with pop-ups, or require you to create an account before you can do anything useful. StackUtils is different:
- No sign-up, no account required. Open any tool and start using it immediately.
- No data uploads. JSON, code, files — everything is processed locally in your browser using Web APIs.
- Keyboard-friendly. Every tool is designed for fast, efficient use by developers.
- Open and transparent. Our privacy policy and terms are written in plain English.
Get in Touch
Found a bug? Want to suggest a new tool? We'd love to hear from you. Send us a message — we read every one.
Built With
StackUtils is built with modern, proven open-source technologies:
Next.js 15
React framework with App Router and server components
TypeScript
Type-safe JavaScript across the entire codebase
Tailwind CSS
Utility-first CSS for fast, consistent UI
Web APIs
Crypto, Canvas, Web Audio — all client-side processing
Vercel
Edge-deployed with global CDN for fast load times worldwide
Google Analytics
Privacy-aware, aggregate-only usage metrics
Developer Blog
We publish in-depth guides on the technologies behind our tools — JSON, Base64, regular expressions, CSS, UUIDs, and more. Written by developers, for developers.