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Linanxi12
Linanxi12

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I Built 13 Free Developer Tools I Built 13 Free Developer Tools That Run 100% in Your Browser

#webdev #productivity #programming #javascript

I Built 13 Free Developer Tools That Run 100% in Your Browser (No Signup, No Tracking)

I got tired of Googling "JSON formatter" and landing on ad-infested sites that required signups or sent my data to who-knows-where. So I built my own.

quickdev.cc — 13 developer tools, all running locally in your browser.

What's Included

Tool Why You Need It
JSON Formatter Format, validate, and minify JSON — with tree view
Base64 Encoder Encode/decode text and files instantly
JWT Decoder Inspect JWT header & payload, check expiry
Regex Tester Real-time regex matching with group capture
SQL Formatter Beautify SQL queries (MySQL, PostgreSQL, SQLite)
QR Code Generator Create QR codes for URLs, text, WiFi
Diff Checker Line-by-line text comparison
Markdown Preview Write and preview Markdown in real time
Color Converter Convert between HEX, RGB, HSL
Timestamp Converter Unix timestamp ↔ human-readable date
UUID Generator Generate UUID v4 in bulk
URL Encoder URL-encode/decode strings
Password Generator Cryptographically random passwords

Why I Built This

Three principles drove every decision:

  1. Client-side only — Your data never leaves your browser. Period.
  2. No signup — Open the page, use the tool, done. Zero friction.
  3. Fast & clean — Dark theme, no distractions, loads instantly.

I didn't want another bloated SaaS. I wanted something that feels like a VS Code extension — there when you need it, invisible when you don't.

Tech Stack (Spoiler: It's Simple)

  • Pure HTML, CSS, and vanilla JavaScript
  • Zero frameworks. Zero build step.
  • CDN for Markdown parser and QR library
  • Hosted on GitHub Pages (free, fast, global CDN)
  • Custom domain via Cloudflare

The entire site is static. No server means no server costs, no data breaches, no privacy policy nightmares.

What I Learned

  • Simple tools win. JSON formatter took 50 lines of code and gets the most usage.
  • Client-side is a feature. "Your data never leaves your browser" is a surprisingly powerful trust signal.
  • AI search is the new SEO. ChatGPT/Claude are already sending traffic to browser-based tools because they're safe to recommend.
  • Shipping beats perfection. The first version had 5 tools. Now it has 13. Each addition compounds traffic.

What's Next

I'm adding more tools based on what people actually use. If you have a tool you'd like to see, drop a comment.

Try it: https://quickdev.cc
(Note: custom domain is propagating — currently live at https://linanxi12.github.io/devbox-tools/)

All feedback welcome — especially bug reports and feature requests.

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