UUID Generator

About Toolula Dev

Everyday developer tools that stay on your device

Format JSON, test regular expressions, decode tokens, encode and hash text, generate IDs and compare files. Everything runs in this browser tab, so code, tokens and secrets never leave your device.

Format and compare

JSON formatter with errors marked on the line, plus text, JSON and YAML compare on Prism's comparison view.

Check and decode

Regex tester with live highlights and groups, JWT decoder with readable dates, Unix timestamp converter.

Encode and hash

Base64 and URL encoding in both directions, SHA hashes, colour conversion.

Generate

UUIDs, strong passwords, placeholder text and colour shades with WCAG contrast.

Frequently asked questions

Is my data sent anywhere?

No. Every tool runs in your browser. Tokens, passwords and files are processed on your device and never uploaded.

Can I link to a tool?

Yes. Each tool has its own address, for example toolula.com/dev/regex-tester, and you can star tools to keep them at the top of the list.

Does the JWT decoder check the signature?

No. It decodes the header and payload and shows their dates; checking the signature needs the secret or public key.

Are the generated passwords and UUIDs random enough?

Yes. They come from the browser's cryptographic random generator (crypto.getRandomValues / randomUUID), the same source used for keys.