Developer Tools

Inspect HTTP response headers for any URL. Review security headers, caching directives, CORS, and server metadata.

Parse user agent strings to identify browser, engine, operating system, device type, and bot detection.

Compare two texts and highlight added, removed, and changed lines or words instantly in your browser.

Send HTTP requests with custom methods, headers, and bodies, then inspect status, headers, and response — no CORS limits.

Decode JSON Web Tokens to inspect the header, payload, and claims instantly in your browser — no data leaves your device.

Beautify and explore JSON with adjustable indentation, key sorting, a collapsible tree view, and structure stats.

Convert JSON to clean, indented XML with configurable root and item element names — entirely in your browser.

Convert XML into clean JSON with attribute handling, type parsing, and adjustable indentation — all in your browser.

Convert JSON into clean, readable YAML with adjustable indentation — entirely in your browser.

Convert YAML into clean JSON with type parsing and adjustable indentation — entirely in your browser.

Convert Excel spreadsheets (XLSX, XLS, ODS) to CSV in your browser, with per-sheet selection and delimiter options.

Convert CSV data into a downloadable Excel workbook (XLSX, XLS, ODS) in your browser, with delimiter detection and number parsing.