Free Password Generator

Why Use a Password Generator Instead of Making One Yourself?

Humans are terrible at randomness. Even when trying to pick a "random" password, people gravitate toward patterns: keyboard walks like qwerty, dictionary words with substitutions like P@ssw0rd, or dates and names findable through social engineering. A 2023 analysis of 200 million breached passwords found that over 60% could be cracked within minutes using standard GPU rigs because they followed predictable human patterns.

A password generator solves this entirely. By delegating character selection to a CSPRNG, every output is as close to true randomness as software can produce — billions of times harder to crack than any human-chosen password.

What Makes a Password Truly Strong?

• Length first: A 20-character lowercase-only password has more entropy than a 10-character all-types password. Every extra character multiplies the search space exponentially.
• Unpredictability: No dictionary words, names, or keyboard patterns. Crackers use mangling rules that try "3" for "e" and "@" for "a" automatically.
• Uniqueness per account: One breach should never cascade into twenty. Use a password manager and generate a fresh password for every login.
• High entropy: 60+ bits is strong; 80+ bits is practically uncrackable with current and near-future hardware.

How Entropy and Crack-Time Are Calculated

Entropy = log₂(charset_size) × length. A 16-character password using uppercase + lowercase + digits (62 chars) yields roughly 95 bits. Crack-time assumes a dedicated offline attacker at 10 billion guesses per second — the realistic upper bound for GPU clusters today. Online attacks are throttled by lockout policies, making real-world protection far stronger.

Recommended Password Lengths by Account Type

• Email and cloud storage: 20–24 characters — your email is the master key to every "forgot password" link
• Banking and finance: 20–24 characters with 2FA; check your bank's character limit
• Social media: 16–20 characters
• Wi-Fi (WPA2/WPA3): 20–63 characters — longer is fine since you type it infrequently
• Work VPN and admin portals: 20+ characters; use your policy as a floor, not a ceiling
• Gaming and streaming: 16+ characters — breach databases frequently include these accounts

NIST Password Guidelines 2024 — What Changed

NIST SP 800-63B revision 4 dropped mandatory complexity rules and periodic rotation requirements. Current guidance prioritizes: minimum 15 characters, checking against breach databases, allowing all printable Unicode, and not requiring periodic changes unless compromise is suspected. The NIST preset in this tool reflects these updated recommendations.

Password Managers — The Missing Piece

A generator solves the creation problem; a password manager solves storage and retrieval. You do not need to memorize generated passwords. Pair this tool with Bitwarden (open-source, free), 1Password, or Dashlane and you only need to remember one strong master password.

Frequently Asked Questions