Password Generator

Written byOleh Soloninupdated 5 October 2026

Length

Use Uppercase

Use Lowercase

Use Digits

Use Symbols

Result

Passwordgenerated in your browser…
Strength≈ 103 bits from an 85-character alphabet

Length beats cleverness

Build a strong password with the character sets you choose. Generated in your browser and never sent over the network.

Substituting a 3 for an E fools nobody — cracking software tried those variations decades ago. What actually resists an attack is length combined with genuine randomness.

Every password here is generated in your browser and never leaves it. Pair this with a password manager, because the whole point of a random password is that you should not be able to memorise it.

How to use

Set the length: 16 characters for ordinary accounts, 20 or more for email, banking and your password manager.
Leave all four character sets on; if a site rejects symbols, switch them off and add length instead.
Generate again for a different result, then copy it straight into a password manager.

Length beats cleverness

The strength of a random password is its length multiplied by the base-2 logarithm of the alphabet size. Because the logarithm grows so slowly, the alphabet is the weaker lever: moving from 62 characters to 85 adds half a bit per position, while four extra positions add twenty-four.

The table makes the trade concrete. Sixteen characters drawn from all four sets reach 103 bits; dropping symbols costs eight bits, and four more characters more than repay it.

Every figure comes from the generator on this page. The last row is the warning: a random sixteen-digit PIN, about 53 bits, sits only just above eight random characters from the 85-character set, about 51 bits — for all its length.
Password	Alphabet	Strength
8 characters, all sets	85	≈ 51 bits
12 characters, all sets	85	≈ 77 bits
16 characters, letters and digits	62	≈ 95 bits
16 characters, all sets	85	≈ 103 bits
20 characters, all sets	85	≈ 128 bits
16 digits	10	≈ 53 bits

What this calculator shows

A fresh random password at the length you set
Independent toggles for uppercase, lowercase, digits and symbols
Local generation, with nothing sent to any server

What to keep in mind

Uses the browser's random generator, which is suitable for password material.
Some systems silently reject certain symbols; if a password is refused, turn symbols off and add length instead.

FAQs

How long should a password actually be?

Sixteen characters is a sensible floor for accounts that matter, twenty for email and banking. Email matters most: it is the reset channel for everything else.

Are the passwords stored or logged anywhere?

No. Generation happens entirely in the browser, and the value exists only on your screen until you copy it.

Are symbols essential?

Less than their reputation suggests. Dropping symbols takes a sixteen-character password from 103 bits to 95; adding two characters more than gets that back, and it never breaks a sign-in form.

What do the bits in the strength line mean?

How many times the number of possibilities doubles. 51 bits is about two quadrillion combinations; 103 bits is twice that number squared. Every bit doubles the search, so the gap between 51 and 103 is not double — it is astronomical.

What if a site rejects some characters?

Turn symbols off and add length. Sixteen characters from 85 give 103 bits; twenty from 62 give 119. A ban on punctuation is fully repaid by four extra positions.

Should every account get its own password?

Yes, and this matters more than anything else on the page. Reuse turns one service's breach into a break-in everywhere the same password was used.

Worked example

Why length wins

Input: 16 characters, all four sets enabled

Output: 85 possible characters per position

Note: That is about 7.4 × 10³⁰ combinations. Adding four more characters multiplies the work by another 52 million.

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Password Generator

Result

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