Password & Security Generators
5 tools in this collection — free, instant, and private in your browser.
Password and security generator tools exist because humans are notoriously poor at creating truly random credentials. We gravitate toward familiar words, predictable patterns, and reused strings — all of which make passwords easier to remember but far easier to crack. These tools replace guesswork with cryptographically informed generation, giving you credentials that meet modern security standards without requiring you to invent randomness yourself.
The tools in this category serve two distinct purposes. Generation tools — the Password Generator, Secure Password Generator, Passphrase Generator, and Random PIN Generator — create new credentials from scratch. The Password Crack Time Estimator evaluates credentials you already have (or are considering) by modelling how long a modern attack would take to break them under various attack scenarios.
Understanding the difference between a password and a passphrase is central to choosing the right tool. A password generator produces a string of mixed characters (uppercase, lowercase, digits, symbols) of a fixed length. A passphrase generator produces a sequence of random common words — typically four to six words — separated by spaces or hyphens. Passphrases are longer in total characters, which makes them extremely resistant to brute-force attacks, and they are often easier to type and remember because the words are meaningful even if the combination is random.
PINs are a different category: short numeric codes used where the interface accepts only digits — bank cards, phone unlock screens, door keypads. The Random PIN Generator produces PINs free of the patterns (birth years, repeated digits, keyboard runs) that make human-chosen PINs predictable.
The Password Crack Time Estimator is useful both for auditing existing passwords before you commit to using them and for understanding the security implications of length versus character-set complexity. A 12-character all-lowercase password takes far less time to crack than a 12-character mixed-character password of the same length, and the estimator makes that difference concrete and comparable.
All password & security generators
All generator tools →Compare these tools
| Tool | What it does |
|---|---|
| Passphrase Generator | Generate a random passphrase made of common English words. Long but memorable — ideal for master passwords. Free, no signup. |
| Password Crack Time Estimator | Estimate how long your password takes to crack under 4 attacker scenarios, with zxcvbn-style pattern detection and a local passphrase generator. Nothing is uploaded. |
| Password Generator | Generate strong, random passwords instantly. Runs in your browser. |
| Random PIN Generator | Generate a random numeric PIN of any length (4–12 digits). Free, runs in your browser, never stored. |
| Secure Password Generator | Generate a cryptographically random password that guarantees at least one uppercase, lowercase, digit, and symbol. Free, runs in your browser. |
Frequently asked questions
- Is a passphrase actually more secure than a random character password?
- It depends on length. A four-word passphrase drawn from a large word list (say, 7,776 words) has roughly 51 bits of entropy, comparable to a fully random 8-character password using letters and digits. A six-word passphrase reaches about 77 bits, which is stronger than most character-based passwords people actually use. The key advantage is that passphrases are far easier to type correctly and remember without writing down, which reduces the risk of the password being exposed through a sticky note or an insecure notes app.
- What length and character set should I use for a generated password?
- For most online accounts, a minimum of 16 characters with a mix of uppercase, lowercase, digits, and symbols is the current practical recommendation. The exact combination matters less than the total length: each additional character multiplies the search space for an attacker. If the site restricts symbols or length, prioritise length over special characters — a 20-character alphanumeric password is stronger than a 12-character one with symbols. Use a password manager to store generated passwords so length is never a memorability constraint.
- How does the Password Crack Time Estimator calculate its results?
- The estimator models the number of possible combinations for your password based on its length and the character set it appears to use (lowercase only, mixed case, with digits, with symbols). It then divides that number by a realistic attack rate — typically measured in billions of guesses per second for modern GPU-based cracking hardware — to produce a time estimate. The result is a worst-case figure assuming the attacker knows your character set but not your specific password. Real-world crack times can be lower if your password follows a recognizable pattern, and higher if the attacker is using slower hardware.