Free Online Developer Tools
Format, validate and transform your data instantly — no signup required, everything runs in your browser.
JSON Formatter
Format, validate and minify JSON instantly.
XML Formatter
Format, validate and minify XML with syntax highlighting.
HTML Formatter
Beautify or minify HTML code in one click.
HTML Viewer
Render and preview HTML directly in your browser.
Image to PDF
Convert images to a PDF file instantly.
Regex Tester
Test regular expressions with real-time match highlighting.
Cron Builder
Build cron expressions and get natural language descriptions.
JWT Decoder
Decode and inspect JWT tokens — header, payload and claims instantly.
JS Formatter
Beautify or minify JavaScript code instantly in your browser.
Diff Checker
Compare two texts, code snippets or JSON files and see what changed.
Hash Generator
Compute MD5, SHA-256, SHA-512 hashes and generate UUID v4 / random tokens.
cURL to Code
Convert cURL commands to Python, JavaScript, Java or C# code instantly.
About Developer Tools
Developer Tools is a free, privacy-friendly collection of browser-based utilities built for developers. All processing happens locally in your browser — your data is never sent to a server.
Whether you need to format a JSON response, validate XML, preview an HTML snippet, test a regular expression or convert an image to PDF, you will find a fast and simple tool here.