49 Developer Tools · Zero Signup · Zero Upload · Zero Tracking
KRUMB.DEV is a privacy-first toolkit for developers. Format JSON, decode JWTs, test regular expressions, minify code, generate passwords, convert between formats, and dozens more — all inside your browser. Nothing is uploaded. Nothing is tracked. No account required.
If you've ever hesitated before pasting a JWT or a private key into a random website, this is the alternative you've been looking for.
Most developer tool websites share the same pattern: create an account, hit a rate limit, endure sidebar ads, and wonder if your paste is being logged somewhere. KRUMB.DEV was built differently.
| Other Sites | KRUMB.DEV |
|---|---|
| Your data is sent to a server for processing | Everything runs in your browser — 100% client-side |
| Sign up required for basic features | Zero accounts. Open the page, use the tool. |
| Ads, popups, and upgrade prompts | Clean terminal interface. No distractions. |
| One tool, one bookmark, one tab | 49 tools at a single URL |
| Unknown data retention policies | Your data never leaves your device |
- JSON payloads, tokens, source code, and passwords are processed locally using browser APIs (
Web Crypto,TextEncoder, native parsers) - Tools that require server interaction (DNS lookups, SSL certificate checks, webhook proxying) use lightweight edge functions that log nothing and retain no payloads
- No analytics scripts run on any tool page
- No cookies, no fingerprinting, no tracking
All 47 tools are organized by category. Open any one in seconds.
Formatters & Validators · JSON Formatter · JSON Validator · Code Beautifier (17 languages) · SQL Formatter (17 dialects) · HTML Minifier · JavaScript Minifier · CSS Grid Generator · API Response Validator
Encoders & Decoders · Base64 Encoder/Decoder · URL Encoder/Decoder · JWT Decoder · HTML to Markdown · HTML to JSX · YAML ↔ JSON · JSON ↔ CSV · Case Converter
Generators · Password Generator · UUID Generator (v1/v3/v4/v5) · Hash Generator (MD5, SHA, HMAC) · QR Code Generator · Lorem Ipsum Generator · Color Palette Generator · CSS Gradient Generator · CSS Box Shadow Generator · Meta Tag Generator · Robots.txt & Sitemap Generator · .gitignore Generator
Testing & Debugging · Regex Tester · Diff Checker · Webhook Tester (Stripe/GitHub/Shopify) · cURL → Code Converter · HTTP Status Code Reference · Cron Expression Builder · Cron Translator
Converters · Unix Timestamp Converter · Hex ↔ RGB · Binary Converter · SVG → JSX · JSON → TypeScript · HTML Playground · Markdown Editor
Network & Security · DNS Lookup & SSL Checker · QR Code Decoder · IP Address Lookup · IBAN Validator
The terminal interface is not decorative — it's a deliberate constraint. Every tool fits inside a single-column, monospace layout with no sidebar, no floating widgets, and no visual noise. The result is an environment where the tool and its output are the only things on screen.
- ⌘K opens a command palette to instantly jump to any tool
- Every output block has a one-click copy button
- All state is local — refreshing the page resets nothing on the server because there is no server
# No installation needed.
# Just open the site:
open https://krumb-dev-five.vercel.app
# Or press ⌘K and type the tool you need.That's it. No npm install, no environment variables, no database migrations.
KRUMB.DEV is a static-first Next.js application. It requires no database, no API keys, and no backend services to run. To deploy your own instance or contribute:
git clone https://github.com/Shabir-Ahmad-tech/toolhub.git
cd toolhub
npm install
npm run dev # local development
npm run build # static production buildMIT — use it, modify it, deploy it. Attribution is appreciated but not required.