Password & UUID Generator
Generate strong random passwords and UUID v4 identifiers using your browser's secure crypto API. Nothing is ever uploaded.
Strong password in one line: length ≥ 12–16, mix uppercase, lowercase, digits and symbols, and use a unique password for every site. This tool uses crypto.getRandomValues and runs entirely in your browser — nothing is uploaded.
✅ Quick Answer
A strong password is at least 12–16 characters with mixed character types. A UUID v4 looks like 550e8400-e29b-41d4-a716-446655440000 (8-4-4-4-12). Try a 16-character password, a 32-character high-security password, or 5 UUIDs below.
Rule of thumb: every extra character multiplies the combinations an attacker must try. Use a password manager and never reuse passwords across sites.
Frequently Asked Questions
How does the password generator create secure passwords?
It uses the browser's cryptographically secure random number generator (crypto.getRandomValues), the same source used by banks and security tools. Combined with long length and mixed character types, the passwords are effectively unguessable.
Is it safe to generate passwords on this website?
Yes. All generation happens locally in your browser using the Web Crypto API. Your passwords are never transmitted, stored or seen by any server.
What is a UUID v4?
A UUID v4 is a 128-bit identifier formatted as 8-4-4-4-12 hex digits, e.g. 550e8400-e29b-41d4-a716-446655440000. The version 4 variant is generated from random numbers, making collisions practically impossible. It is widely used as database keys and unique identifiers.
What makes a strong password?
Length is the most important factor — every extra character multiplies the guessable combinations. A good password is at least 12–16 characters long, uses a mix of uppercase, lowercase, digits and symbols, and contains no words or personal information.
Should I reuse generated passwords?
Never reuse passwords across different sites. If one site is breached, attackers will try the same password everywhere. Use a unique password for every account and store them in a reputable password manager.
Are generated passwords saved anywhere?
No. Passwords are created inside your browser using the Web Crypto API and are never written to a server, cookie, file or database. As soon as you leave or refresh the page, they are gone.
Can a UUID v4 ever repeat?
Practically never. A UUID v4 has 122 random bits, so the chance of two colliding is about 1 in 2.7×10³⁶ — far smaller than any real-world accident. They are safe to use as unique keys.
How long should a password be?
Use at least 12 characters for everyday accounts and 16–20 for important ones like email or banking. Length contributes more to security than adding symbols, because it exponentially increases the number of possible combinations.
What is password entropy?
Entropy measures randomness in bits: length × log₂(pool size). Roughly, 60 bits is weak, 80 fair, 100+ strong, and 128+ is excellent. Our strength meter shows this value so you can judge safety at a glance.
Why is Web Crypto safer than Math.random()?
Math.random() is not cryptographically secure and can be predicted. We use crypto.getRandomValues, a CSPRNG vetted by browser vendors and used by banks, so every character is genuinely unpredictable.
Strong Password & UUID Generator — Security Made Simple
Weak or reused passwords are the most common way accounts get hacked. Our generator creates truly random passwords using the browser's secure crypto API, so every character is independent and unpredictable. You choose the length and character mix, and we never see what you generate.
Why use our password generator?
- Cryptographically secure randomness via crypto.getRandomValues.
- Configurable length from 6 to 64 characters.
- Independent toggles for uppercase, lowercase, digits and symbols.
- Optional exclusion of ambiguous characters like 0, O, 1, l, I, 5, S, 2, Z, 8 and B.
- Live strength meter to help you choose a strong length.
- 100% private — generation never leaves your browser.
UUID v4 generation
- Generate database primary keys, file names or order IDs.
- Create unique test data and fixtures for development.
- Batch-generate up to 100 UUIDs at once and copy them all.
- Use the standard RFC 4122 format, compatible with every language and platform.
Protect your accounts with strong, unique passwords and generate reliable identifiers in seconds. Fast, free and private.
Password length vs. security
| Length | Character set | Approx. entropy | Recommended use |
|---|---|---|---|
| 8 | Upper + lower + digits | ~48 bits | Not recommended |
| 12 | Upper + lower + digits + symbols | ~78 bits | General accounts |
| 16 | Upper + lower + digits + symbols | ~105 bits | Recommended |
| 24 | Upper + lower + digits + symbols | ~157 bits | High security |
| 32 | Upper + lower + digits + symbols | ~210 bits | Master password / keys |
UUID format comparison
| Version | Format | Random bits | Typical use |
|---|---|---|---|
| UUID v4 | 8-4-4-4-12 | 122 | Random unique IDs, keys |
| UUID v7 | time-ordered + random | 74+ random | Sortable DB keys |