Strong Password & Passphrase Generator

Create high-entropy passwords with custom character sets or memorable multi-word passphrases in your browser using crypto.getRandomValues(). Includes instant entropy rating and brute-force crack time analysis.

Your inputs are calculated locally in your browser. No personal data is sent across the network.

Generated Password

0 characters

Strength:Very Weak(0 bits entropy)

Crack time: Instant

Password Length: 16

Generate in Bulk:

Cryptographically Secure & Private: Generated directly on your device using the browser's Web Crypto API (crypto.getRandomValues). Your passwords are never transmitted over the network or saved anywhere.

How to use this tool

1Step 1

Select Random Password or Memorable Passphrase (Diceware) mode.

2Step 2

Adjust length or word count and select your desired character sets.

3Step 3

Inspect the live entropy meter and crack time estimate.

4Step 4

Click Copy or generate bulk passwords at once.

Frequently asked questions

How are passwords generated securely?

Passwords are generated locally on your device using window.crypto.getRandomValues(), a cryptographically secure pseudorandom number generator (CSPRNG). Passwords are never sent to or stored on any server.

What is a Diceware passphrase?

A Diceware passphrase combines multiple random, memorable English words (e.g. 'Correct-Horse-Battery-Staple'). They provide high cryptographic entropy while remaining easy for humans to remember and type.

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