Free Secure Password Generator
Generate a strong random password or memorable passphrase in your browser. No account required. No password is ever sent to LifeVault Secure — the math runs entirely on your device.
Built by the team behind LifeVault Secure, an encrypted password manager and digital legacy vault.
Reviewed by the LifeVault Secure Security Team. Last updated .
How to use the LifeVault Secure password generator
A password generator is a tool that produces random, hard-to-guess passwords or passphrases for use with online accounts, typically running entirely in your browser.
LifeVault Secure’s generator gives you two modes: a random password or a memorable passphrase. Pick the one that fits where you’ll use it.
Random password (recommended for most accounts). Drag the length slider — minimum 8, maximum 128, default 20 characters. Toggle which character types you want: uppercase letters, lowercase letters, numbers, and symbols. Turn on Exclude ambiguous characters if you’ll need to type the password by hand on a device without autofill — it removes characters that look alike (O and 0, l and 1, I and |).
Passphrase (recommended for master passwords and anything you have to remember). Choose how many words to chain together — minimum 3, maximum 12, default 5. Pick a separator: hyphen, period, underscore, or space. Optional toggles: capitalize each word and append a number.
Click Generate. A new password appears in the result field, with a strength label below it. The result updates every time you change a setting or click Generate again — no two generated values are ever the same.
Copy the result. Tap the copy icon next to the result field. Then paste it into the signup or password-change form on the site you’re protecting. If you generated a master password or anything you need to recover later, save it somewhere you can find again — your LifeVault Secure account is a good home, but a paper copy in a safe also works.
One generator, one tab. Don’t share the result. Don’t take a screenshot. Close this tab when you’re done — the result is held only in your browser’s memory and is wiped on refresh.
What makes a password strong?
A strong password is at least 16 characters, uses uppercase, lowercase, numbers, and symbols, and is never reused across accounts.
A strong password is one that an attacker can’t guess in any reasonable amount of time, even with a powerful computer running offline. Three things determine that: length, character variety, and randomness. Length matters most.
The math is straightforward. A password is one combination out of the total pool of possibilities. A 20-character password drawn randomly from the 94 printable ASCII characters represents one of roughly 2.9 × 1039 combinations — about 131 bits of entropy. At a generous offline-attack speed of one trillion guesses per second, the average time to crack it works out to more than 1031 years. That is longer than the age of the universe, multiplied by itself, multiplied again.
Cut the length in half and the math collapses. A 10-character password from the same pool is one of about 5.4 × 1019 combinations — 65 bits of entropy. The same attacker now needs an average of about a year. A 6-character password? Hours.
Character variety adds bits, but length adds them faster. Doubling your alphabet from 26 lowercase letters to 52 mixed-case letters adds 1 bit per character. Adding one more character at the original alphabet adds about 4.7 bits. Length wins.
Randomness is the part humans get wrong. A 16-character password you invented with a meaningful pattern — your dog’s name plus your zip code plus an exclamation point — is shorter, in entropy terms, than the same 16 characters drawn randomly. Attackers don’t try all 1024 combinations; they try the patterns humans use first. A randomly generated password from this tool doesn’t fall into that trap.
The U.S. National Institute of Standards and Technology (NIST) updated its password guidance to recommend length over forced character-class complexity, and to drop required periodic password resets, per NIST SP 800-63B. The math agrees.
Password vs. passphrase — which is safer?
A passphrase is a sequence of three to seven randomly selected unrelated words, more memorable than a random password with comparable security.
Both can be strong. Which one is safer for you depends on whether you’ll need to type it or remember it without a password manager.
Use a random password for everything that gets autofilled. Almost every account you have — email, bank, shopping, work tools — should use a long random password that you never type by hand. Your password manager fills it in. The longer and more random, the better. A 20-character random password from this tool gives you about 131 bits of entropy and is functionally uncrackable for any current attacker.
Use a passphrase for the few passwords you need to remember. Your master password, your laptop login, the password that protects your password manager itself — these you’ll type. A 5-word passphrase drawn from a 7,776-word dictionary (the EFF “large” wordlist used by Bitwarden and others) gives you about 65 bits of entropy. That works out to roughly 7.8 × 1018 combinations, or about a quarter-million years of average cracking time at one trillion guesses per second. Memorable, typable, strong.
The trap to avoid: a short passphrase made of common words isn’t strong. Three short words like correcthorsebattery looks long but has roughly 39 bits of entropy — the same as a random 8-character password. Modern offline attackers crack that in days. The strength comes from the number of words, the size of the wordlist they’re drawn from, and the fact that they were chosen by a random number generator, not by you.
If you can remember 5 random words, prefer a passphrase. If software is going to type it for you, prefer a random password.
How our generator keeps your passwords private
Every password this tool produces is generated on your device, in your browser, using window.crypto.getRandomValues — a cryptographic random-number API that the browser itself implements. We don’t run a server-side generator. We don’t make an API call when you click Generate. Open the network panel of your browser’s developer tools and watch — there is no request.
What this means in practice:
- The generated password exists only in your browser tab’s memory.
- It is not logged anywhere on LifeVault Secure servers, because it never reaches them.
- It is wiped when you close or refresh the tab.
- If you save it into your LifeVault Secure vault, it is encrypted in your browser before it is sent — even LifeVault Secure staff with full database access cannot read it. This is what we mean by zero-knowledge encryption.
Tied to our pricing commitment. LifeVault Secure publishes a pricing pledge: free is free, no ads, no data sale, no surprise paywalls on accounts that were created free. The generator is part of that promise. You can use this tool without an account, today and indefinitely. If you decide to save what you generate, the Free tier of LifeVault Secure includes a password vault, unlimited password entries, and AES-256 client-side encryption — at $0/month, no card required.
We can’t see what you generate here, and we don’t want to. The whole point of an encrypted password manager is that you don’t have to trust us with the contents — only with the engineering of the math around them. The generator page is the simplest demonstration of that posture: no server involved at all.
For the full technical story on password storage best practices and strong password guidance from CISA, see the linked references. LifeVault Secure’s full security architecture is documented in the security white paper.
Store your generated passwords in an encrypted vault
A generated password is only useful if you can find it again. A sticky note works for one. A spreadsheet works for ten. Beyond that, you need a system designed for it.
LifeVault Secure’s Free tier gives you a password vault with unlimited password and passkey entries, 256 MB of encrypted storage, categories and tags, AES-256 client-side encryption, and three connected devices. It costs $0 per month, no credit card required, and falls under our pricing pledge — it isn’t a trial that converts.
If you need more — emergency access for a partner, more vaults, more storage, more collaborators — LifeVault Secure Pro is $12/month or $120/year and includes 5 GB of encrypted storage, up to 40 vaults, emergency access policies, the template marketplace, and up to 5 collaborators per vault. There’s a 14-day free trial.
For complete digital estate protection — unlimited vaults, unlimited emergency access policies, up to 20 collaborators per vault, and 15 GB of storage — Vault is $29/month or $290/year. For families, Family Legacy is $49/month or $490/year and adds up to 5 family members, 30 GB of shared storage, and a shared family dashboard.
Whichever tier you pick, the passwords you store are encrypted in your browser before they ever reach our servers. Compare plans on the pricing page.
Password generator FAQs
How does the LifeVault Secure password generator work?
You pick a length and character types (for random passwords) or a word count and separator (for passphrases), then click Generate. Your browser uses its built-in cryptographic random-number generator, window.crypto.getRandomValues, to pick the characters or words. The result appears in the field on your screen. Nothing leaves your device — no network request is made when you click Generate.
Is it safe to use an online password generator?
It is safe if the generator runs in your browser and never sends your generated password over the network. LifeVault Secure's generator does both. You can verify this by opening your browser's developer tools, switching to the Network tab, and clicking Generate — you will see no request fire. Avoid online generators that run server-side or that don't disclose how generation happens.
What makes a password strong?
Length, randomness, and character variety, in that order. A randomly generated 20-character password drawn from uppercase, lowercase, numbers, and symbols offers about 131 bits of entropy — roughly 2.9 × 10³⁹ combinations, which no current attacker can brute-force. Passwords you invent yourself are usually weaker than they look, because attackers try human patterns first. Always generate, never invent, the passwords protecting accounts that matter.
How long should my password be?
For accounts your password manager will autofill, use 20 characters or more with mixed character types. For master passwords or anything you have to type from memory, use a 5-word passphrase or longer. The U.S. National Institute of Standards and Technology recommends prioritizing length over forced complexity rules — a long random password beats a short complex one every time, by orders of magnitude.
What is a passphrase and is it more secure than a password?
A passphrase is a sequence of randomly chosen words separated by a hyphen, period, or space — for example, four or more words from the EFF 7,776-word list. It is more memorable than a random string and, at five words or more, more than strong enough for a master password. A short three-word passphrase is not safe. A long random password is safer for any account you don't have to type.
Can I save passwords I generate here in my LifeVault Secure account?
Yes. If you have a LifeVault Secure account, you can copy any password generated here and paste it into a new entry in your encrypted vault. LifeVault Secure encrypts every entry in your browser before it reaches our servers, using AES-256 with keys derived from your master password — so even LifeVault Secure staff cannot read what you save. The Free tier includes unlimited password entries.
Does LifeVault Secure store the passwords I generate?
No. Passwords generated on this page exist only in your browser tab's memory and are wiped when you close or refresh the tab. No network request is made when you click Generate. LifeVault Secure servers never see the generated value. The only way a generated password reaches LifeVault Secure is if you separately save it into your encrypted vault, in which case it is encrypted in your browser first.