10 Free, Private, Client-Side Developer Tools. No signup. No uploads. No BS.
🔗 Live Site · Tools · Why · Deploy
Every "free online tool" site uploads your data to their server. JSON formatters send your code to a backend. Image compressors store your photos. Password generators log what they generate.
This one doesn't. Every tool runs entirely in your browser using:
| Technology | Used For |
|---|---|
Canvas API |
Image compression without upload |
crypto.getRandomValues() |
Cryptographically secure passwords & UUIDs |
JSON.parse/stringify |
Local JSON processing |
FileReader API |
In-browser file handling |
marked.js |
Client-side Markdown rendering |
TEST IT: Open DevTools Network tab, use any tool, and see — zero outgoing requests with your data.
| # | Tool | What It Does | Searches/mo |
|---|---|---|---|
| 1 | JSON Formatter | Format, validate, minify JSON | 100K+ |
| 2 | Image Compressor | Compress images locally, no upload | 50K+ |
| 3 | QR Code Generator | Real scannable QR codes, download PNG | 30K+ |
| 4 | Password Generator | Crypto-safe random passwords | 20K+ |
| 5 | Base64 Encoder/Decoder | Text & file to Base64 | 15K+ |
| 6 | UUID Generator | UUID v4, batch generate | 10K+ |
| 7 | URL Encoder/Decoder | encodeURI + encodeURIComponent | 8K+ |
| 8 | Color Converter | HEX ↔ RGB ↔ HSL, color picker | 20K+ |
| 9 | Markdown Preview | Live GFM preview | 5K+ |
| 10 | Text Diff Checker | Line-by-line diff with LCS algorithm | 8K+ |
| Feature | DevToolHub | TinyWow | Code Beautify | JSONFormatter.org |
|---|---|---|---|---|
| No upload | ✅ | ❌ | ❌ | ❌ |
| No signup | ✅ | ✅ | ✅ | ✅ |
| Open source | ✅ | ❌ | ❌ | ❌ |
| Works offline | ✅ | ❌ | ❌ | ❌ |
| No ads (yet) | ✅ | ❌ | ❌ | ❌ |
| Free | ✅ | ✅ | ✅ | ✅ |
One click to deploy a copy to your own GitHub Pages:
- Fork this repo
- Go to Settings → Pages
- Select
mainbranch, root (/) - Done — your site is live at
yourname.github.io/devtoolhub
Or run locally:
git clone https://github.com/HD1019/devtoolhub.git
cd devtoolhub
python -m http.server 8000 # or any static server
# Open http://localhost:8000- Zero frameworks — Vanilla HTML, CSS, JavaScript
- Zero dependencies — Except
marked.js(CDN) for Markdown preview - Zero build step — Just HTML files. Edit and refresh.
- Zero server costs — Static files on GitHub Pages
- Zero tracking — No Google Analytics, no cookies, no fingerprinting
- Add 10 more tools (Word Counter, Timestamp Converter, JSON to CSV, etc.)
- PWA support (install as app, full offline)
- Dark/light theme toggle
- Keyboard shortcuts
- i18n (Chinese + English already, more coming)
If this project saved you 5 minutes, give it a ⭐ on GitHub — it helps others find it.
→ Star this repo · → Get the Developer Launch Kit
MIT — use it, modify it, deploy it, sell it. Just don't resell the source as-is.
Built in 1 day by HD1019 · No AI-generated anythings here (ok maybe a little)