About Crypto Tools Online

Crypto Tools Online is a free collection of browser-based cryptography and security utilities. Generate strong passwords, score password strength, mint UUIDs, hash with bcrypt, decode JWTs, and AES-encrypt text — all without sending a single byte to a server.

We believe primitives this sensitive should never leave your device. Every tool on this site runs entirely in your browser. Your passwords, tokens, and secrets stay local; we have no technical ability to read them.

What We Offer

Our current toolset:

  • Password Generator — Create cryptographically random passwords of any length and character class, powered by crypto.getRandomValues.
  • Password Strength Checker — Score any password with zxcvbn (Dropbox's open-source estimator) and see explicit weakness explanations.
  • UUID Generator — Mint v1, v4, or v7 UUIDs by the hundreds — the same primitives used for distributed database keys and idempotency tokens.
  • Bcrypt Hash Generator — Hash and verify passwords with bcrypt, the algorithm used by every responsible auth system.
  • JWT Decoder — Inspect the header and payload of any signed JSON Web Token without verifying its signature server-side.
  • AES Encryption — AES-256 encrypt and decrypt text with a passphrase using crypto-js.

How It Works

Everything is JavaScript. Generation, hashing, decoding, and encryption all run inside your browser tab using widely audited open-source libraries — bcryptjs, zxcvbn, jwt-decode, uuid, and crypto-js. Our servers only ship the HTML, CSS, and JavaScript that make the tools work; they never see your inputs.

Why Browser-Based?

Plenty of "online password generators" actually do generate passwords on the server and send them back over the network. Logs and proxies might see those values. Our tools eliminate that risk by design: there is no server-side path for your secrets.

Our Principles

  • Free, always — No premium tiers, no credits, no paywalls.
  • No registration — Use any tool immediately, no account required.
  • Privacy-first — Zero data collection on tool inputs. Nothing leaves your browser.
  • Vetted primitives — Built on Dropbox-, Auth0-, and community-maintained libraries with public security history.

A Caveat

These tools cover everyday needs. For high-stakes encryption (medical records, legal data, regulated compliance) please use purpose-built software like age, GPG, or vetted enterprise vaults with proper key management. We are utilities, not a complete cryptosystem.

If you have suggestions for new tools or found a bug, reach out via our Contact page.