Password Generator

Generate strong, cryptographically secure random passwords using browser Web Crypto API.

Generated Password

Strong (104 bits entropy)

Customization Settings

Password Length: 16 characters

Uppercase (A-Z)ABCDEF...

Lowercase (a-z)abcdef...

Numbers (0-9)0123456789

Special Symbols!@#$%^&*...

Exclude Ambiguous CharactersOmits visually similar glyphs: i, l, 1, L, o, 0, O

Generate in Batch:

Cryptographically Secure Random Generation

All passwords are generated using the browser's native crypto.getRandomValues Web Crypto API, guaranteeing high-entropy pseudo-random numbers suitable for security-sensitive credentials. Generated passwords exist only in local browser memory and are never transmitted, logged, or stored.

How to use Password Generator

1Choose your desired password length using the interactive slider or number input (16+ characters recommended).
2Select your character sets: Uppercase letters (A-Z), Lowercase (a-z), Numbers (0-9), and Special Symbols (!@#$...).
3Toggle 'Exclude Ambiguous Characters' to prevent confusing similar glyphs (such as '1', 'l', 'I', '0', and 'O').
4Select single or batch generation (up to 20 unique passwords at once).
5Click the copy button or 'Copy All' to store the credentials in your password manager.

Key Features & Highlights

•Web Crypto CSPRNG: Utilizes window.crypto.getRandomValues for true cryptographic entropy, strictly avoiding predictable pseudo-random seeds.
•Unbiased Sampling: Employs rejection sampling and Fisher-Yates shuffling to eliminate mathematical modulo bias in character selection.
•Real-Time Entropy Metrics: Calculates exact Shannon entropy in bits with qualitative strength indicators from Weak to Very Strong.
•Batch Generation: Quickly produces sets of 1, 5, 10, or 20 distinct passwords for multi-account migrations.
•Zero Storage & Zero Telemetry: Credentials are created purely inside your browser memory; nothing is logged, transmitted, or saved.

The Science of Strong Password Generation

According to modern cybersecurity benchmarks established by NIST (Special Publication 800-63B), the most critical factor in password resilience is length and unpredictability. Short passwords with forced character diversity can easily fall prey to dictionary and targeted brute-force attacks, whereas sufficiently long passwords drawn from a wide random pool require astronomical amounts of computational energy to crack.

Understanding Password Entropy

Entropy measures the unpredictability of a password, quantified in bits. The formula for password entropy is:

Entropy (Bits) = L × log&sub2;(R)

Where L is the password length, and R is the pool size of possible characters (e.g. 95 characters for full alphanumeric plus symbols).

Entropy (Bits)	Security Tier	Practical Vulnerability
< 36 bits	Very Weak	Can be cracked in seconds using modern multi-GPU rigs.
36 – 59 bits	Weak	Vulnerable to fast dictionary and automated online guessing.
60 – 79 bits	Good	Resistant to online rate-limited attacks; acceptable for standard logins.
80 – 119 bits	Strong	Recommended standard for bank accounts, primary email, and servers.
120+ bits	Very Strong	Immune to offline brute-force attacks across all classical computers.

Why Browser-Native Web Crypto Matters

Standard JavaScript Math.random() is an unseeded pseudo-random number generator designed for speed in simulations, not cryptography. Its internal state can often be deduced from a short sequence of values. In contrast, BrivTools exclusively invokes crypto.getRandomValues(), drawing cryptographically strong randomness directly from the host operating system entropy pool (such as /dev/urandom on Linux/macOS or BCryptGenRandom on Windows).

Frequently Asked Questions

How does this secure password generator work?

The generator uses your browser's native Web Crypto API (crypto.getRandomValues) to produce cryptographically secure pseudo-random integers. These indices select characters from your enabled pools (uppercase, lowercase, numbers, and symbols) using unbiased rejection sampling to guarantee equal probability.

Are generated passwords saved, logged, or sent to a server?

No. Generated passwords are never transmitted across a network, never logged, and never stored. All operations take place strictly in the client-side JavaScript memory of your web browser and disappear once you close or refresh the page.

What makes a password strong?

Password strength depends primarily on length (16+ characters), randomness, and character diversity. A 16-character password combining letters, numbers, and symbols provides over 100 bits of entropy, which would take millions of years to brute-force.

What are ambiguous characters and why exclude them?

Ambiguous characters are letters and numbers that look almost identical in many fonts—such as uppercase 'I', lowercase 'l', the number '1', uppercase 'O', and the number '0'. Excluding them helps prevent transcription errors when typing passwords manually on mobile devices or printed cards.

Can I generate multiple passwords at once?

Yes. You can select batch generation for 1, 5, 10, or 20 passwords simultaneously, and copy individual passwords or use 'Copy All' to export the entire list.