How strong is a 16-character random password?

A 16-character password using all four character types (uppercase, lowercase, digits, symbols) has roughly 102 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, but each word from this tool's 240-word list adds only about 8 bits of entropy: four words give about 32 bits, while 16 random characters of all types give about 102 bits.

Can I generate multiple passwords at once?

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

Does a copied password stay anywhere?

The generator keeps a password only in the page, until you generate a new one or close the tab. When you copy it, Windows clipboard history, cloud clipboard sync, Apple Universal Clipboard or a clipboard manager may keep a copy. In a private window, Chrome, Edge and Firefox keep copies out of Windows clipboard history and cloud clipboard.

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

Copying puts the password on your clipboard. Your operating system may keep it in its clipboard history.

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 and character sets, and generate up to 100 at once. All processing runs in your browser.

Strong password generator

Create strong, hard-to-crack passwords in your browser. See the entropy in bits and the strength rating. All processing runs in your browser.

Memorable password generator

Generate memorable word-based passwords with the Web Crypto API. Easier to type and remember than random characters. All processing runs in your browser.

Password Generator: No Account Required

Generate cryptographically secure passwords for free, with no account and no sign-up. All generation runs in your browser.

Wi-Fi password generator

Generate Wi-Fi passwords from letters and digits that guests can type on a phone. 12 characters by default, symbols optional. Runs in your browser.

PIN generator

Generate random numeric PINs of 4 to 8 digits with crypto.getRandomValues(). Pick a length, copy one PIN or make up to 100 at once. Runs in your browser.

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 password for a new account and saving it in a password manager
Making a Wi-Fi password, then turning it into a QR code guests can scan
Bulk-generating passwords for staging or QA test accounts, or creating random IDs when you need identifiers rather than secrets

Technical specification

Algorithm or formula: Uniform random sampling from the selected charset or word list, 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 list of 240 common four-letter English words (about 7.9 bits of entropy per word).
Input limits: Length 4 to 64 characters, or 3 to 8 words in memorable mode. 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

How strong is a 16-character random password?: A 16-character password using all four character types (uppercase, lowercase, digits, symbols) has roughly 102 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, but each word from this tool's 240-word list adds only about 8 bits of entropy: four words give about 32 bits, while 16 random characters of all types give about 102 bits.
Can I generate multiple passwords at once?: Yes. The bulk generation section lets you generate up to 100 passwords at once. All independently random.
Does a copied password stay anywhere?: The generator keeps a password only in the page, until you generate a new one or close the tab. When you copy it, Windows clipboard history, cloud clipboard sync, Apple Universal Clipboard or a clipboard manager may keep a copy. In a private window, Chrome, Edge and Firefox keep copies out of Windows clipboard history and cloud clipboard.

Related tools

Background reading: Complete guide to developer tools
Step by step: Generate and hand off a password by QR code

Reviewed and tested September 30, 2026.