Developer tools

Generators, encoders, decoders and formatters. Every tool runs in the browser — no data leaves your device, and no account is required.

Password Generator

Generate strong random passwords in your browser with configurable length and character sets.

UUID Generator

Create RFC 4122 version 4 UUIDs using the browser's cryptographic random source.

Random String Generator

Produce random strings of any length from letters, digits and symbols.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to UTF-8 text.

JWT Decoder

Inspect the header and payload of a JSON Web Token without sending it anywhere.

URL Encoder / Decoder

Percent-encode and decode URL components safely.

JSON Formatter

Pretty-print, minify and validate JSON with clear error messages.

How these tools work

Every tool on this page uses browser-native APIs: crypto.getRandomValues() for random generation, SubtleCrypto.digest() for hashing, and standard TextEncoder / atob / btoa for encoding tasks. There is no server round-trip when you press the button.

This matters when your input is sensitive — a JWT from an email you received, a token you need to inspect, a password you are about to copy. Nothing is logged.

Need a test inbox too?

Generate a disposable email address instantly — no signup, fully external.

Generate a temporary email