What Is a Password Generator and Why You Need One

Why Your Current Passwords Are Probably Weak

Most people know they should use strong, unique passwords — and most people do not. The reason is simple: strong passwords are hard to invent and even harder to remember. So instead, people reuse the same familiar password across dozens of accounts, maybe swapping out a number at the end when a site forces them to change it.

The problem with this approach is not just that one weak password is easy to guess. It is that when any single service you use suffers a data breach — and breaches happen constantly — every account sharing that password is immediately at risk. Attackers take leaked credential databases and run them automatically against hundreds of other sites in seconds. This technique, called credential stuffing, is responsible for the majority of account takeovers.

A password generator solves this problem at its root. Instead of you trying to invent something memorable, the tool creates a password that is genuinely random and cryptographically strong — something no human would ever type spontaneously, and therefore something no attacker could guess or brute-force in a practical timeframe.

What Makes a Password Actually Strong?

Strength in a password comes down to one concept: entropy. Entropy is a measure of unpredictability — how many possible combinations an attacker would need to try before stumbling on the right one. The higher the entropy, the longer a brute-force attack takes, and the safer the password.

Entropy increases with two things: length and character variety. A 16-character password using only lowercase letters has far less entropy than a 16-character password using uppercase, lowercase, numbers, and symbols — even though both are 16 characters long. Adding each new character type multiplies the number of possible combinations exponentially.

The practical takeaway: 12 characters with full character variety is the minimum for any account you care about. For email accounts, banking, or anything linked to payment methods, 16+ characters is the right target.

How a Password Generator Works

A good password generator uses a cryptographically secure random number generator (CSPRNG) to select characters from a defined character set. This is fundamentally different from the kind of randomness your brain produces when you try to "think of something random" — humans are notoriously bad at true randomness and tend to follow predictable patterns without realising it.

Modern browsers expose a CSPRNG through the Web Crypto API, which is what well-built online generators use. This means the passwords are generated entirely inside your browser — the tool never sends your password to any server or stores it anywhere. The generation happens locally, which is both faster and more private.

What options should a good generator offer?

• Password length — Typically 8 to 64 characters, with 16 as a sensible default.
• Uppercase letters (A–Z) — Adds a second character pool alongside lowercase.
• Lowercase letters (a–z) — Almost always included.
• Numbers (0–9) — Required by most sites.
• Symbols (!@#$%^&* etc.) — Significantly increases entropy; some sites restrict which symbols are allowed.
• Exclude ambiguous characters — Removes characters like l, I, 1, O, 0 that look similar in certain fonts, useful if you ever need to type the password manually.

How to Generate a Strong Password on Convixy

Convixy's password generator runs entirely in your browser. No account, no signup, no data sent to a server. Here is how to use it:

• 1
  Go to convixy.com/password-generator. A strong 16-character password is generated automatically the moment the page loads.
• 2
  Adjust the length slider and toggle character types (uppercase, numbers, symbols) to match what the site you are signing up to requires.
• 3
  Click the copy button to copy the password to your clipboard, then paste it directly into the password field. Click the refresh icon to generate a new one at any time.
• 4
  Save the password in a password manager (see below) — do not try to memorise it. That is the whole point.

Where to Store Generated Passwords

The most common objection to using a password generator is: "I cannot remember a 16-character random string." You are not supposed to. Generated passwords are designed to be stored in a password manager, not memorised.

A password manager is an encrypted vault that stores all your passwords behind a single master password. You only ever need to remember one thing — your master password — and the manager handles filling in the right credentials for every site automatically. Popular options include Bitwarden (free and open-source), 1Password, and the built-in password managers in Chrome and Safari.

The workflow becomes: generate a unique random password for a new account → paste it into the signup form → let the password manager save it → never think about it again. Over time, every account you own ends up with a unique, unguessable password without any mental effort.

Passwords vs. Passphrases: Which Is Better?

A passphrase is a sequence of random words rather than random characters — for example, correct-horse-battery-staple. Passphrases get their strength from length: each word adds a large amount of entropy, and four or five random words produce a password that is both very strong and far easier to type or remember than a string of random symbols.

Passphrases are particularly useful for your master password — the one password you actually need to remember. For everything else (the hundreds of site-specific passwords you will never type manually), a random character password stored in a manager is just as good and slightly shorter for the same entropy level.

When to use which

• Random character password (16+ chars): Site logins, app accounts, anything stored in a password manager.
• Passphrase (4–5 random words): Your password manager master password, device login, full-disk encryption key.

Common Password Mistakes to Avoid

Even people who use a generator sometimes undermine their own security with habits around passwords. Here are the most common ones:

• Reusing passwords across sites. Even one reused password creates a chain of vulnerability. Every account should have its own unique password.
• Using personal information. Names, birthdays, pet names, and phone numbers are guessable by anyone who knows you (or by anyone who has looked at your social media).
• Storing passwords in plain text. A text file, a note on your phone, or a sticky note on your monitor are all serious security risks. Use a proper password manager.
• Not enabling two-factor authentication (2FA). A strong password is one layer of protection. Adding 2FA means that even if your password is compromised, an attacker still cannot get in without physical access to your phone or authenticator app.
• Never changing passwords after a breach. Check services like Have I Been Pwned to see if any of your email addresses have appeared in known data breaches, and change those passwords immediately.

Does Password Length or Complexity Matter More?

Length wins. A 20-character password using only lowercase letters has more entropy than a 10-character password using every possible character type. That said, the two are not mutually exclusive — a long password that also uses a full character set is the strongest possible option.

The practical recommendation for 2026: use a minimum of 16 characters with uppercase, lowercase, numbers, and at least some symbols. This puts any brute-force attack well beyond what is computationally feasible with current hardware, including specialised password-cracking rigs.