Development
Small utilities to work better with data and code.
Format JSON
Validates, sorts indentation, or minifies JSON with clear errors.
Base64 encoder
Encode and decode Unicode text in Base64, without sending your data.
JSON to CSV
Converts JSON objects to a CSV table, checks its columns, and downloads the file.
Compare text
Find added, deleted and equal lines between two versions, with changes and download view.
Responsive tester
Review your local HTML/CSS/JS profiles on iPhone, iPad and 120 screen sizes, with rotation and zoomed view.
Regular expression tester
Try a JavaScript pattern and check matches, groups, and indexes without blocking the interface.
Web playground
Edit HTML, CSS and JavaScript files with highlighting, live preview and ZIP export.
JWT decoder
Query the header and payload of a JWT without sending it to a server.
CSV to JSON
Converts CSV rows to JSON objects, with configurable separator and preview.
Compare JSON
Finds value changes, keys added and removed between two JSON documents.
Escape HTML entities
Escapes special characters or retrieves basic HTML entities, without executing the content.
Number base converter
Convert integers between binary, octal, decimal and hexadecimal, without losing large digits.
UUID generator
Creates UUID v4 identifiers with cryptographic randomness, one or several at a time.
Timestamp converter
Converts Unix seconds to a UTC date or a zoned ISO date to Unix seconds.
URL encoder
Encodes or decodes a URL component with Unicode text and special characters.
Hash generator
Calculates SHA-256 or SHA-512 from UTF-8 text in the browser.
URL parser
Breaks down protocol, host, route, fragment and parameters without visiting the link.
URL Parameter Editor
Add, modify and remove parameters while preserving duplicates and the fragment.