A collection of useful web tools for developers and everyone else.
Built to eliminate the hassle of constantly searching for common utilities. Focused on practicality and accessibility.
| Tool | Description |
|---|---|
| JSON Formatter | JSON formatting, validation, and minification |
| Case Converter | camelCase, PascalCase, snake_case and more |
| Space Remover | Remove unnecessary spaces and line breaks |
| Comma Formatter | Add thousand separators to numbers |
| Regex Tester | Test, search, and replace with regular expressions |
| Diff Checker | Compare and visualize text differences |
| Markdown <-> HTML | Convert between Markdown and HTML |
| Text Counter | Real-time character, word, sentence, paragraph count |
| Tool | Description |
|---|---|
| Base64 | Text/file encoding and decoding |
| URL Encoder | URL-safe string conversion |
| JWT Decoder | Decode JWT tokens and check expiration info |
| Tool | Description |
|---|---|
| Hash Generator | Generate MD5, SHA-1, SHA-256, SHA-512 hashes |
| UUID Generator | Generate UUID v4 and custom-length IDs |
| Password Generator | Generate secure, strong passwords |
| Tool | Description |
|---|---|
| Unit Converter | Length, weight, temperature, area, file size, etc. |
| Currency Exchange | Real-time exchange rate lookup and conversion |
| Base Converter | Convert between binary, octal, decimal, hexadecimal |
| Image Converter | Convert between PNG, JPG, WebP formats |
| Tool | Description |
|---|---|
| World Time (KST) | Check world city times based on Korea Standard Time |
| World Time (UTC) | UTC time, timestamps, and ISO 8601 conversion |
| Tool | Description |
|---|---|
| Date Calculator | D-day calculation, date difference, add/subtract dates |
| Age Calculator | Age in years/months/days, days until next birthday |
| Tool | Description |
|---|---|
| Random Picker | Random selection from lists or number ranges |
| Tool | Description |
|---|---|
| QR Code Generator | Convert text/URL to QR code with download |
| Cron Generator | Create and validate cron schedules |
| Color Picker | Convert between HEX, RGB, HSL color formats |
| .env Editor | Organize env files with duplicate check, masking, sorting |
| HTTP Status Code | Search HTTP status code meanings and use cases |
- React 19 + TypeScript
- Vite 7
- Tailwind CSS 4
- React Router 7
- Zustand (State Management)
- Vitest (Testing)
# Install dependencies
npm install
# Run development server
npm run dev
# Build for production
npm run build
# Run tests
npm test
# Deploy (GitHub Pages)
npm run deployMIT
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.