Why Another Developer Toolbox?
Every developer has been there: you need to quickly format some JSON, generate a QR code, or encode a string to Base64. You search, click the first result, and get hit with ads, cookie banners, and a signup wall — all for something that should take two seconds.
That’s why I built a set of free, no-nonsense browser tools that just work. No accounts, no tracking, no server-side processing. Everything runs in your browser.
The Tools
JSON Formatter & Validator
Paste in messy JSON, get clean, syntax-highlighted output. It validates your JSON on the fly and shows clear error messages when something’s wrong. Supports minification too — handy when you need to stuff JSON into a config field or URL parameter.
Use cases:
- Debugging API responses
- Validating config files
- Minifying JSON for production
Text Summarizer
Drop in a long article or document and get a concise summary. Powered by AI, running client-side. Great for quickly digesting lengthy documentation, meeting notes, or research papers without reading every word.
Use cases:
- Summarizing documentation
- Quick overview of long emails or reports
- Condensing research notes
QR Code Generator
Type a URL, text, or any data — get a QR code instantly. Download it as PNG for presentations, business cards, flyers, or documentation. Customizable size, and the generation happens entirely in your browser.
Use cases:
- Sharing URLs at presentations or meetups
- Adding QR codes to printed materials
- Quick device-to-device text transfer
Color Palette Generator
Generate harmonious color palettes for your next project. Extract colors, explore complementary schemes, and copy hex/RGB values with a click. Whether you’re designing a UI, picking a theme, or just exploring color combinations — this has you covered.
Use cases:
- UI/UX design exploration
- Finding complementary colors for branding
- CSS theme generation
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to readable text. Simple, fast, and useful more often than you’d think — embedding images in CSS, decoding JWT payloads, working with APIs that use Base64 encoding.
Use cases:
- Encoding/decoding JWT tokens
- Data URI generation
- Debugging encoded API payloads
Markdown to PDF Converter
Write or paste Markdown, get a clean PDF. Supports full GitHub-flavored Markdown — tables, code blocks, task lists, the works. Perfect for turning README files into shareable documents or converting notes into printable format.
Use cases:
- Converting documentation to PDF for distribution
- Creating printable reports from Markdown notes
- Generating clean PDFs from README files
Why These Tools?
A few principles behind the toolbox:
- Privacy first — Nothing leaves your browser. No data is sent to any server.
- No friction — No signup, no ads, no cookie consent popups. Open the link, use the tool.
- Fast — Static pages, minimal JavaScript. They load instantly.
- Free forever — These tools cost nothing to host and nothing to use.
The Full Toolbox
All tools live at stevenli-phoenix.github.io/toolbox — bookmark it and you’ll always have them handy.
| Tool | Link |
|---|---|
| JSON Formatter | toolbox/json.html |
| Text Summarizer | toolbox/summarizer.html |
| QR Code Generator | toolbox/qrcode.html |
| Color Palette | toolbox/colors.html |
| Base64 Encoder | toolbox/base64.html |
| MD to PDF | md2pdf |
Support the Project
If you find these tools useful, consider buying me a coffee — it helps keep the lights on and motivates me to build more free tools for the developer community.
Got a tool idea? I’m always looking for what to build next. Drop a suggestion on the Buy Me a Coffee page or open an issue on GitHub.
Happy coding!