I Built a Collection of 100+ Free Developer Tools That Run Entirely in the Browser
As developers, we constantly run into small tasks that interrupt our workflow:
- Formatting JSON
- Decoding JWTs
- Converting timestamps
- Comparing configuration files
- Generating UUIDs
- Building cron expressions
Most of these tasks don't require a full application or a paid SaaS product. They just need a simple utility that works immediately.
That's why I started building Solution Toolkit — a collection of browser-based developer tools focused on everyday development tasks.
My Goals
When building the toolkit, I wanted it to be:
- Free to use
- No sign-up required
- Privacy-first
- Fast and lightweight
- Available directly in the browser
Most tools run entirely client-side, so data never leaves your device.
What's Included?
Some of the categories currently available:
JSON & API Tools
- JSON Formatter
- JSON Validator
- JSON Escape / Unescape
- JSON Converters
- JWT Debugger
Encoding & Decoding
- Base64 Encoder / Decoder
- URL Encoder / Decoder
- HTML Encoder / Decoder
- ASCII Converter
- GZip Base64 Decoder
Formatting & Validation
- SQL Formatter
- YAML Formatter
- CSS Formatter
- JavaScript Formatter
- HTML Formatter
- Markdown Formatter
Developer Utilities
- UUID Generator
- Cron Expression Builder
- Epoch Timestamp Converter
- QR Code Generator
- Hash Generators
Image Tools
- Image Compression
- Image Resizing
- PNG/JPG/WebP Conversion
- SVG Utilities
What I Learned Building It
A few things surprised me:
- Developers care a lot about privacy for utility tools.
- Browser APIs are powerful enough to handle many tasks entirely client-side.
- Small utilities often provide more daily value than large applications.
Looking for Feedback
I'm actively adding new tools and improving existing ones.
What browser-based developer tool do you wish existed?
Or what's a utility you find yourself searching for repeatedly?
I'd love to hear suggestions.
🔗 Project: https://www.solutiontoolkit.com
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