Password Generator

Generate secure passwords online with customizable length, character sets, and strength meter. Free password generator with entropy score and security rating.

Password Settings
16
43264128
Characters

Run a check to see results

APIPOST /api/v1/util/password
5(51 votes)
2
checks performed
Try also: Hash Generator
Run Check

Key Features

100% Free

No registration required, unlimited checks

Instant Results

Real-time analysis with detailed output

REST API Access

Integrate into your workflow via API

Accurate Data

Live queries to authoritative sources

What is Password Generator?

The password generator creates cryptographically secure random passwords using your browser's built-in CSPRNG (Cryptographically Secure Pseudo-Random Number Generator), ensuring true randomness that cannot be predicted or reproduced. You can customize password length (8 to 128 characters), choose which character types to include (uppercase letters, lowercase letters, numbers, special symbols), and exclude ambiguous characters that look similar in some fonts (0/O, 1/l/I). Each generated password displays an entropy score (measured in bits) and a strength rating from weak to very strong.

This free secure password generator runs entirely in your browser — no passwords are ever transmitted to or stored on any server. It's used by security-conscious individuals creating strong passwords for their accounts, IT administrators generating initial passwords for user accounts, developers seeding test databases with realistic password data, and anyone following security best practices by using unique passwords for every service.

How to Use

  1. 1Set your desired password length using the slider
  2. 2Choose which character types to include (uppercase, lowercase, numbers, symbols)
  3. 3Click generate to create a random secure password
  4. 4Copy the password and check the entropy score and strength rating

Who Uses This

System Administrators

Monitor and troubleshoot infrastructure

Developers

Debug network issues and integrate via API

SEO Specialists

Verify domain configuration and performance

Security Analysts

Audit and assess network security

Frequently Asked Questions

How long should a secure password be?
Security experts (NIST, OWASP) recommend at least 12-16 characters for standard accounts and 20+ characters for high-security accounts (admin, financial, email). Password cracking speed doubles with each additional bit of entropy, so every extra character makes the password exponentially harder to crack. A random 16-character password using all character types would take billions of years to brute-force with current technology. For maximum security with memorability, consider a passphrase — four or more random words (e.g., 'correct horse battery staple') provide excellent entropy while being easier to remember.
What makes a password truly strong?
A strong password has three key properties: length (12+ characters — the most important factor), randomness (generated by a CSPRNG, not chosen by a human — humans are predictable), and character diversity (mixing uppercase, lowercase, digits, and special symbols increases the keyspace). Avoid: dictionary words in any language, personal information (names, dates, addresses), keyboard patterns (qwerty, 123456), character substitutions (p4ssw0rd is not clever — attackers check these), and reusing passwords across services. This generator creates truly random passwords using cryptographic randomness.
What is password entropy and how is it calculated?
Entropy measures the theoretical difficulty of guessing a password, expressed in bits. It's calculated as: log2(character_pool_size ^ password_length). For a 16-character password using all 95 printable ASCII characters: log2(95^16) = about 105 bits of entropy. Benchmarks: under 40 bits is weak (can be cracked in minutes), 40-60 bits is moderate, 60-80 bits is strong, 80-100 bits is very strong, and 100+ bits is considered computationally infeasible to brute-force with any current or near-future technology.
Is this password generator safe to use?
Yes — the generator runs entirely in your browser using the Web Crypto API's cryptographically secure random number generator (CSPRNG). Generated passwords are never transmitted to any server, never stored anywhere, and never leave your device. The randomness source is the same one your browser uses for generating TLS session keys and other security-critical operations. After copying your password, it exists only in your clipboard and wherever you paste it.
Should I use a different password for every account?
Absolutely — using unique passwords for every account is one of the most important security practices. If one service suffers a data breach (which happens regularly to companies of all sizes), the exposed password can only compromise that one account. Attackers routinely test leaked credentials across thousands of other services (called credential stuffing). A password manager stores all your unique passwords encrypted behind one master password, making this practical. Generate a strong unique password for each service using this tool and store it in your password manager.

Related Tools

Hash Generator

UUID / ULID Generator

Base64 Encoder/Decoder

URL Encoder/Decoder

Popular Tools

DNS Lookup

WHOIS Lookup

Domain Age

Nameserver Checker

API Endpoint

POST /api/v1/util/password
View Documentation