How strong is a 16-character random password?

A 16-character password using all four character types (uppercase, lowercase, digits, symbols) has roughly 105 bits of entropy, which is far beyond what any current computer can brute-force. The generator uses crypto.getRandomValues() in your browser for cryptographic-grade randomness.

Is the generated password sent to a server?

All passwords are generated in your browser tab using the built-in crypto.getRandomValues() API. Our servers are not involved at any point.

What is the difference between a random password and a memorable one?

Random character passwords are maximally unpredictable but hard to type from memory. Memorable word-based passwords (passphrases) are easier to recall while still being cryptographically secure.

Can I generate multiple passwords at once?

Yes. The bulk generation section lets you generate up to 100 passwords at once. All independently random.

Password generator

Password generator is a developer tool that creates random, strong, or memorable passwords using cryptographically secure randomness. It supports adjustable length, configurable character sets, a passphrase mode, and bulk generation of up to 100 passwords. The tool runs in your browser.

Very strong · 102 bits

Length16

A–Z uppercasea–z lowercase0–9 numbers!@# symbols

Bulk generation

Generatepasswords

Dedicated pages

Direct links for specific password types.

Random password generator

Generate random passwords instantly in your browser. Choose length, character se…

Strong password generator

Create strong, hard-to-crack passwords in your browser. See the entropy in bits …

Memorable password generator

Generate memorable word-based passwords (passphrases) in your browser. Easier to…

Password Generator: No Account Required

Generate cryptographically secure passwords with no account, no sign-up, and no …

Wi-Fi password generator

Generate short, memorable Wi-Fi passwords your guests can type quickly. 12 chara…

PIN generator

Generate random numeric PINs from 4 to 8 digits in your browser. Cryptographical…

How to generate a password

Choose between random characters or memorable words mode.
Set the length (characters) or word count using the slider.
Toggle character types, uppercase, lowercase, numbers, and symbols.
Copy the generated password, a new one is ready instantly whenever you need it.

Common uses

Creating a unique, strong password for a new account signup
Generating a memorable passphrase for a password manager master password, paired with a UUID generator when you need unique identifiers alongside it
Bulk-generating test credentials for staging environments or QA, then hashing them before storing

Technical specification

Algorithm or formula: Uniform random sampling from the selected charset using rejection sampling to avoid modulo bias. Cryptographic randomness comes from crypto.getRandomValues() (Web Crypto API), backed by the OS CSPRNG.
Browser API or library: Web Crypto API (crypto.getRandomValues). Memorable mode uses a curated word list of common English words.
Input limits: Length 8 to 64 characters. Bulk mode generates up to 100 passwords per batch.
Output: Plain text password, copyable to clipboard. Entropy estimate (bits) calculated from charset size and length.
Known limitations: Generated passwords are not stored; once cleared they cannot be retrieved. Memorable passphrases trade some entropy per character for memorability.

Frequently asked questions

Is the generated password sent to a server?: No. Passwords are generated using the browser's built-in crypto.getRandomValues() API entirely in your browser tab. Nothing is transmitted or logged.
How strong is a 16-character random password?: A 16-character password using all character types (uppercase, lowercase, numbers, symbols) has approximately 105 bits of entropy, far beyond what any current computer can crack.
What is the difference between a random password and a memorable one?: Random character passwords are maximally unpredictable but hard to type from memory. Memorable word-based passwords (passphrases) are easier to recall while still being cryptographically secure.
Can I generate multiple passwords at once?: Yes. The bulk generation section lets you generate up to 100 passwords at once. All independently random.

Reviewed and tested May 26, 2026.