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Password Generator

Create strong, random passwords up to 50 characters long from selected character sets. Choose from lowercase, uppercase, digits, symbols, and spaces with two selection modes. Includes search-space analysis and entropy calculation.

16
150

Character Sets to Include

Select Evenly From

Password Generator

Create passwords up to 50 characters long from selected sets of characters. Choose any combination of lowercase letters (a–z), uppercase letters (A–Z), digits (0–9), symbols (!@#$%^&*…), and spaces to build a character pool, then generate a cryptographically shuffled random password instantly in your browser.

Two selection modes let you control how characters are drawn — pool every chosen character into a single set for uniform randomness, or rotate through each chosen set in turn for guaranteed representation before a final shuffle. Either way, the result is a fully shuffled password that reveals no pattern about the selection order.

Character Sets to Include

Select the character sets you want considered when this tool randomly selects characters for the password. Including more character sets increases the pool size and therefore the entropy (randomness) of the generated password, making it harder to crack through brute-force search.

Selection Modes Explained

All Chosen Characters

All characters in the sets you selected make up one pooled set of characters and each random selection is made from this full single set. The selected password character set is shuffled before results are provided. This mode maximises entropy per character because every position draws from the entire pool.

Each Chosen Set

Characters are selected as evenly as possible in rotation, one set at a time. For example, if you select the lowercase, uppercase and digits character sets, an 8-character password will be randomly chosen in order from lowercase, uppercase, digits, lowercase, uppercase, digits, lowercase, then finally uppercase. The selected password character set is shuffled before results are provided, so the final output reveals no trace of the round-robin order.

Maximizing the Password Character Search Space

The search space of a password is the total number of possible combinations an attacker would need to try in a brute-force attack. It depends on two factors: the size of the character pool and the length of the password. A larger pool and a longer password both increase the search space exponentially.

Entropy, measured in bits, quantifies this search space on a logarithmic scale. Each additional bit of entropy doubles the number of possible combinations. Security researchers generally recommend at least 60 bits for everyday accounts and 128+ bits for high-value targets.

Current Configuration Search Space

Length

16

Pool Size

89

Entropy (bits)

104

Combinations

1.55 × 10^31

Total combinations = pool_size ^ password_length

89^16 = 1.55 × 10^31

Entropy = length × log₂(pool_size)

16 × log₂(89) = 103.6 bits

Character SetsPool SizeEntropy (8 chars)Entropy (16 chars)
Digits only1026.653.2
Lowercase only2637.675.2
Lower + Upper5245.691.2
Lower + Upper + Digits6247.695.3
Lower + Upper + Digits + Symbols9051.9103.9
All + Space9152.1104.1

Frequently Asked Questions

Is this password generator safe to use?+
Yes. Passwords are generated entirely inside your browser using JavaScript's built-in cryptographic randomness. No passwords are ever sent to a server, saved, logged, or stored anywhere. You can verify this by using the tool with your network connection disabled.
How long should my password be?+
For most online accounts, a 16-character password using lowercase, uppercase, digits and symbols provides roughly 105 bits of entropy — far beyond what brute-force attacks can crack. For master passwords or high-value accounts, aim for 20+ characters or 128+ bits of entropy.
What is password entropy?+
Entropy measures the unpredictability of a password. It is calculated as length × log₂(pool size) and expressed in bits. Higher entropy means more possible combinations for an attacker to search through. Each additional bit doubles the search space.
What is the difference between the two selection modes?+
'All Chosen Characters' pools every selected character into one set and draws uniformly — this maximises per-character entropy. 'Each Chosen Set' rotates through sets in order, guaranteeing at least one character from each set in every cycle, before shuffling the final result. Both produce secure passwords; the second mode simply ensures more balanced representation.
Should I include symbols in my password?+
Including symbols increases your character pool from 62 (letters + digits) to about 90, adding roughly 5 bits of entropy to a 16-character password. Most security experts recommend including symbols when the service allows them. If a service restricts certain symbols, deselect the symbols set and compensate with a longer password.
Why are the passwords shuffled after generation?+
Shuffling (using the Fisher–Yates algorithm) ensures the final password contains no detectable pattern from the selection process — especially important in 'Each Chosen Set' mode where characters are initially picked in a round-robin order. The shuffle makes every character position equally unpredictable.
Can I use this tool offline?+
Yes. Once the page has loaded, the password generator runs entirely in your browser with no server calls. You can disconnect from the internet and continue generating passwords. You can also save this page to your device for offline access.
What makes a password 'strong' vs 'very strong'?+
This tool rates passwords using entropy thresholds: Very Weak (below 28 bits), Weak (28–35 bits), Fair (36–59 bits), Strong (60–127 bits), and Very Strong (128+ bits). A 16-character password with all character sets typically scores 'Strong'. To reach 'Very Strong', use 20+ characters with a full character set.

How to use Password Generator

Simply enter the values in the input fields provided above. Results will update automatically as you type, allowing for instant calculations and side-by-side comparisons.

Our calculators use high-precision mathematical engines to ensure that even the smallest decimal movements are captured accurately.

If you're using this tool on a mobile device, the layout will automatically adjust for touch-friendly interaction. You can save this page to your home screen for quick access.