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Every tool runs in your browser.

Fast, free utilities for developers and electrical engineers — QR codes, JWTs and hashes alongside Ohm’s law, resistor codes and timers. No accounts, no uploads, no waiting: nothing you type or drop here leaves this page.

26 tools

Developer Tools

QR Code Generator
Turn text or URLs into crisp QR codes and download them as PNG or SVG.
Generator
QR Code Reader
Decode QR codes from an image, a drag-and-drop file, or your webcam.
Decoder
TOTP Generator
Turn an authenticator secret or otpauth QR code into live one-time passwords, with a 30-second countdown and one-click copy.
Generator
Text Scrambler
Shuffle characters or words with a reproducible seed and adjustable intensity.
Text
JWT Generator
Build and sign HS256 JSON Web Tokens from a header, payload, and secret.
Generator
JWT Decoder
Inspect a token’s header and payload, with optional signature verification.
Decoder
Base64 Encode / Decode
Encode and decode Base64 for text and files, with URL-safe support.
Converter
Encrypt / Decrypt Text
Encrypt and decrypt text with a passphrase (AES-GCM/CBC) or an RSA public key — output as Base64.
Crypto
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Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 digests, or Argon2 password hashes with a pepper.
Generator
JSON Formatter
Pretty-print, minify, and validate JSON with precise error positions and a tree view.
Text
UUID Generator
Generate one or thousands of v4 UUIDs and copy them all at once.
Generator
URL Encoder / Decoder
Percent-encode or decode URLs and query-string components.
Converter
Regex Tester
Test a JavaScript regular expression live — highlighted matches, capture groups, a replace preview, and a library of common patterns.
Text

Electrical Engineering