A collection of free online developer tools for programmers, software engineers, web developers, DevOps engineers, API developers, and technical teams.
👉 https://www.rameshdas.dev/tools
Use the tools directly in your browser without installing software or creating an account.
Free Online Developer Tools is a collection of practical browser-based utilities designed to make everyday development tasks faster and easier.
The toolkit includes utilities for:
- JSON
- JWT
- Base64
- URLs
- Regex
- UUIDs
- Hashes
- Unix timestamps
- HTTP status codes
- Redirects
- Colors
- HTML
- CSS
- JavaScript
- SQL
- Markdown
- Code comparison
Decode Base64-encoded text into readable content.
Use it for:
- API debugging
- Encoded data
- Tokens
- Data URLs
- Development workflows
👉 https://www.rameshdas.dev/base64-decoder
Encode text or data into Base64.
Useful for:
- APIs
- Data URLs
- Authentication workflows
- Encoded configuration
- Developer testing
👉 https://www.rameshdas.dev/base64-encoder
Generate common cryptographic hashes.
Supported algorithms may include:
- MD5
- SHA-1
- SHA-256
- Other supported hash algorithms
Useful for checksums and data-integrity testing.
👉 https://www.rameshdas.dev/hash-generator
Decode and inspect JSON Web Tokens.
View:
- JWT header
- JWT payload
- Token claims
Useful for debugging authentication tokens.
Decoding a JWT does not require the signing secret.
👉 https://www.rameshdas.dev/jwt-decoder
Generate JWT tokens for development and testing.
Useful for:
- API development
- Authentication testing
- Prototypes
- Local development
👉 https://www.rameshdas.dev/jwt-generator
Convert Unix timestamps and epoch seconds into readable dates and times.
Also convert dates back into Unix timestamps.
Useful for:
- APIs
- Databases
- Logs
- Authentication
- Backend development
👉 https://www.rameshdas.dev/unix-timestamp-converter
Encode text safely for use inside URLs and query parameters.
Useful for:
- API requests
- Query strings
- Web applications
- Links
- Redirect URLs
👉 https://www.rameshdas.dev/url-encoder
Decode percent-encoded URLs and query strings.
For example:
%20 → space
👉 https://www.rameshdas.dev/url-decoder
Generate UUIDs for applications and development.
Useful for:
- Database records
- APIs
- Testing
- Distributed systems
- Application development
👉 https://www.rameshdas.dev/uuid-generator
Test regular expressions against sample text.
Features include:
- Pattern testing
- Live matching
- Match highlighting
- Regex debugging
👉 https://www.rameshdas.dev/regex-tester
Check the HTTP response status of a URL.
Useful for:
- Website debugging
- API troubleshooting
- HTTP response testing
- Server diagnostics
👉 https://www.rameshdas.dev/http-status-checker
Trace URL redirects and inspect redirect chains.
Useful for:
- HTTP debugging
- Website migrations
- SEO
- Redirect troubleshooting
- Finding final destinations
👉 https://www.rameshdas.dev/redirect-checker
Pick and convert colors between common formats.
Useful formats include:
- HEX
- RGB
- HSL
- RGBA
Useful for:
- Web development
- UI design
- Frontend development
- Branding
👉 https://www.rameshdas.dev/color-picker
Tools for formatting, validating, beautifying, viewing, comparing, and minifying source code and data.
Format and beautify JSON into readable, properly indented data.
Features include:
- JSON formatting
- Validation
- Minification
- Tree view
- Search
- Copy
- Sort keys
- JSON path tools
👉 https://www.rameshdas.dev/json-formatter
Validate JSON and identify syntax errors.
Useful for finding:
- Missing commas
- Invalid quotes
- Missing brackets
- Malformed values
- Invalid JSON structure
👉 https://www.rameshdas.dev/json-validator
Explore deeply nested JSON in a readable tree-style interface.
Useful for:
- API responses
- Large JSON files
- Configuration files
- Debugging
👉 https://www.rameshdas.dev/json-viewer
Compare two pieces of text, code, or structured data.
Useful for:
- Code reviews
- Configuration comparison
- JSON comparison
- Finding changes
- Debugging
👉 https://www.rameshdas.dev/diffchecker
Format SQL queries with consistent indentation and structure.
Useful for:
- Database development
- Query debugging
- Code reviews
- Documentation
👉 https://www.rameshdas.dev/sql-formatter
Beautify long or minified SQL queries.
Turn difficult-to-read SQL into clean, structured queries.
👉 https://www.rameshdas.dev/sql-beautifier
Format and indent HTML automatically.
Useful for:
- Frontend development
- Templates
- Generated markup
- Debugging
👉 https://www.rameshdas.dev/html-formatter
Minify HTML by removing unnecessary whitespace and reducing output size.
Useful before production deployment.
👉 https://www.rameshdas.dev/html-minifier
Beautify and format CSS stylesheets.
Useful for:
- Frontend development
- Debugging
- Code reviews
- Maintaining CSS
👉 https://www.rameshdas.dev/css-formatter
Minify CSS by reducing unnecessary whitespace and comments.
Useful for production websites and optimized delivery.
👉 https://www.rameshdas.dev/css-minifier
Minify JavaScript to reduce file size.
Useful for:
- Production builds
- Web performance
- Smaller assets
- Faster delivery
👉 https://www.rameshdas.dev/javascript-minifier
| Category | Tools |
|---|---|
| Developer Utilities | 13 |
| Code Formatters & Minifiers | 11 |
| Total | 24 |
These tools are useful for:
- 👨💻 Software Developers
- 🧑💻 Full Stack Developers
- 🎨 Frontend Developers
- ⚙️ Backend Developers
- 🔌 API Developers
- ☁️ DevOps Engineers
- 🗄️ Database Developers
- 🔐 Security Engineers
- 🧪 QA Engineers
- 🎓 Students
- 🚀 Startup Teams
- 🏢 Engineering Teams
Use the developer tools without expensive subscriptions.
Designed for quick everyday development tasks.
No software installation is required.
Tools that can process data locally are designed to work directly in the browser.
Works across desktop, tablet, and mobile devices.
Built around common development workflows and repetitive tasks.
Whenever possible, processing is performed locally in your browser.
Avoid entering highly sensitive production credentials, secrets, private keys, or confidential information into any online tool unless you have verified how that specific tool handles data.
Visit:
👉 https://www.rameshdas.dev/tools
Choose a tool and start working.
No installation is required.
- Base64 Encoder
- Base64 Decoder
- Hash Generator
- JWT Decoder
- JWT Generator
- Unix Timestamp Converter
- URL Encoder
- URL Decoder
- UUID Generator
- Regex Tester
- HTTP Status Checker
- Redirect Checker
- Color Picker
- JSON Formatter
- JSON Validator
- JSON Viewer
- Diff Checker
- SQL Formatter
- SQL Beautifier
- HTML Formatter
- HTML Minifier
- CSS Formatter
- CSS Minifier
- JavaScript Minifier
Potential additions:
- YAML Formatter
- YAML Validator
- XML Formatter
- XML Validator
- XML Minifier
- JSON to YAML Converter
- YAML to JSON Converter
- JSON to CSV Converter
- CSV to JSON Converter
- JWT Inspector
- JWT Signature Verifier
- API Request Builder
- HTTP Header Checker
- HTTP Header Generator
- URL Parser
- Query String Parser
- MIME Type Lookup
- User-Agent Parser
- HTML Entity Encoder
- HTML Entity Decoder
- CSS Color Converter
- CSS Unit Converter
- JavaScript Beautifier
- JavaScript Formatter
- TypeScript Formatter
- Markdown Formatter
- Markdown to HTML Converter
- JSON Schema Generator
- JSON Schema Validator
- Cron Expression Parser
- Regex Generator
Contributions are welcome!
Create your own fork of the project.
git clone https://github.com/fullstackdeveloper-lang/free-online-developer-tools.git