Encode, decode, format, and validate the data formats developers meet every day: JSON, Base64, YAML, CSV, HTML entities, and URLs. Test regular expressions, minify JavaScript, preview Markdown, and inspect browser user-agent strings. These utilities are free, private, and built for quick copy-paste workflows.
Detect browser, OS, device, screen size, and public IP address.
Write markdown with live HTML preview — updates instantly as you type.
Convert CSV to JSON or JSON to CSV with custom delimiters.
Encode or decode HTML entities like & < > " safely.
Percent-encode or decode URLs and query parameters.
Strip comments and whitespace from JavaScript to reduce file size.
Test regular expressions against text with match highlighting.
Parse browser, OS, and device details from any user agent string.
Convert between YAML and JSON formats bidirectionally.
Encode files and text to Base64 or decode Base64 back to readable form.
Format, minify, and validate JSON with line-level error messages.
Our developer tools cover the most common encoding, formatting, and parsing tasks you encounter during web development. Every tool runs entirely in your browser — your data never leaves your device. This is especially important when working with sensitive data like API keys, authentication tokens, or proprietary code.
Whether you're debugging an API response, encoding URL parameters, testing a regex pattern, or converting between YAML and JSON, these tools give you fast, reliable results without installing packages or configuring environments.
Here's a quick guide to selecting the right developer tool for your task:
Traditional developer utilities often require installation, command-line usage, or cloud services that transmit your code to external servers. Our browser-based approach means zero setup time, complete privacy for sensitive code or data, and instant availability on any device with a web browser. This makes them ideal for quick checks during development, debugging on the go, or working with confidential projects.