Handy utilities for builders and makers
These tools cover small but frequent tasks in web and app development. Paste an API response into the JSON Formatter and Validator to make it readable or find the exact line where it breaks. Convert text with the Base64 Encoder/Decoder, which handles Unicode correctly, and escape snippets for HTML with the HTML Entity Encoder/Decoder.
Need identifiers or credentials? The UUID Generator and Password Generator use your browser’s cryptographically secure random number generator. The QR Code Generator creates static codes for links, text, email, phone numbers and Wi-Fi networks, downloadable as PNG or SVG. Front-end developers can design backgrounds visually with the CSS Gradient Generator and copy ready-to-use CSS.
Built with privacy in mind
Passwords, tokens and data you paste are processed only in your browser tab. They are not transmitted, logged or saved. QR codes are generated directly, without redirect links or tracking, so they keep working forever.
Developer tools FAQ
Are generated passwords safe to use?
They come from crypto.getRandomValues, the same secure source browsers use for encryption keys. Use a password manager to store them.
Do the QR codes expire?
No. The content is encoded in the image itself, so a printed code works for as long as the link or text inside it is valid.
Can the JSON formatter handle large files?
Yes, several megabytes work fine in modern browsers. Extremely large files may take a moment to format.