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Password Generator

Create strong, random passwords in seconds and test the strength of passwords you already use, directly in your browser and without registering.

Updated: July 2026

Password Generator is a free online tool that creates strong, completely random passwords right in your browser. Instead of you thinking about difficult combinations of letters, numbers and symbols (and always ending up using your dog's name or birthday), the tool does this work for you in one click.

Under the hood, it uses crypto.getRandomValues, a secure randomization feature of the browser itself. This means that the passwords generated are unpredictable (they do not follow a pattern) and are not sent to any server: everything happens securely on your own device.

What is it

Having a strong password is the first line of defense against cyberattacks. The Generator allows you to create random passwords online by mixing uppercase and lowercase letters, numbers and symbols, with an adjustable length between 4 and 48 characters. In addition to the generator, the tool also has a Password Tester for you to check the strength of a password you already use, without having to create another one.

How to use

With the tool you can:

  • Generate strong passwords: adjust the length (from 4 to 48 characters) and select which types of characters are included in the password, uppercase, lowercase, numbers and symbols. The strength bar instantly shows whether the result is weak, medium, strong or very strong.
  • Test passwords in the Password Tester tab: type any password and the system calculates its entropy, showing a real estimate of how long a computer would take to crack it by brute force, in addition to checking whether it has 12 or more characters, upper and lower case letters, numbers and symbols.
  • Copy with one click: after generating, use the copy button to paste the password directly into the register or into your password manager.

How does the time to crack the password work?

Password Tester calculates the entropy of your password. Entropy measures how many attempts, on average, it would take to guess the password using a computer trying billions of combinations per second.

  1. The system checks the size of the alphabet used (only lowercase letters count as 26 possible characters; lowercase letters, capital letters and numbers together add up to 62; also using symbols the total rises to 94).
  2. The length of the password exponentially multiplies the number of possibilities.
  3. The result appears in human time (instantaneous, seconds, minutes, hours, days, years or centuries).

Tips

  • The length of the password usually weighs more than the complexity. A 16-character password with only letters is usually stronger than an 8-character password full of symbols.
  • For important accounts, such as email, banking and social networks, prefer passwords of 16 characters or more.
  • Never use the same password on different websites. Use the generator to create a random, unique password for each service.
  • To avoid forgetting so many randomly generated passwords, use a reliable password manager (such as Bitwarden, 1Password or native ones from Apple and Google).

Perguntas frequentes

Is the password generator safe?

Yes. Passwords are created in your own browser using the crypto.getRandomValues feature, which generates truly random values. Nothing you generate is sent or stored on servers.

What is a strong password?

It is a long and unpredictable password, which mixes uppercase and lowercase letters, numbers and symbols. The greater the size and variety of characters, the more difficult it is to guess. The ideal is to have at least 12 characters.

How many characters should a strong password be?

For most accounts, use a minimum of 12 characters. In important services, such as email and banking, prefer 16 or more. The generator allows you to adjust the length from 4 to 48 characters, and longer passwords are much more difficult to crack through trial and error.

Is an 8 character password secure?

In most cases, no. Eight characters is considered short by today's standards and can be broken down quickly by trial and error, even with symbols. Whenever the site allows it, prefer to generate passwords with 12 characters or more.

What is the difference between the Password Generator and the Tester?

The Generator creates a new, random password from scratch, according to the length and character types you choose. Tester takes the opposite approach: you enter a password you already use and the tool calculates its strength and an estimated time to crack it.

Do I need to pay or register to use it?

No. The tool is completely free and does not require registration or login. Just adjust the options, generate the password and copy.

How to save generated passwords?

As random passwords are difficult to remember, it is best to save them in a reliable password manager. This way you keep a different password for each account without having to remember them all.

Sobre este conteúdo

Escrito por:
Equipe Ferramenta Grátis
Atualizado em:
2 de julho de 2026

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Strong Password Generator and Free Password Tester