The 6 Best Free Password Generators in 2026 (No Upload, No Tracking)

A password generator is one of the few tools where the privacy claim is literal. The generator should produce randomness on your device, show you the result, and forget it instantly. No history, no log, no upload. The mainstream web tools mostly get this right, but a surprising number of "free random password generator" results in the app stores are ad-supported tools that log every password they produce.

This post lists the 6 most reliable free password generators that respect the privacy model. Each was tested for randomness source (must be crypto.getRandomValues, not Math.random), no upload, and no analytics tracking.

The 6 best free password generators

1. Uttir Password Generator

The Uttir Password Generator runs entirely in your browser. Adjustable length (4-128 characters), character classes (uppercase, lowercase, digits, symbols), and the random source is the browser's crypto.getRandomValues (cryptographically strong, not Math.random). No history, no log, no upload.

Best for: generating a single strong password when you need one quickly.

2. 1Password Generator

1Password's web-based generator runs in the browser, uses crypto.getRandomValues, and produces memorable passwords (the "Smart Password" format) or random ones. You do not need a 1Password account to use the generator. The page is ad-free, and the generator runs entirely client-side. Recommended by security researcher Troy Hunt.

Best for: memorable passwords (the random-word format is more memorable than pure random characters).

3. Bitwarden Password Generator

Bitwarden's free password generator runs in the browser and in the desktop / mobile app. The web version does not require an account. You can set length, character classes, and "avoid ambiguous characters" (skip 0/O, 1/l/I). Random source: the browser's crypto API.

Best for: people already using Bitwarden as their password manager, and for the "avoid ambiguous characters" option.

4. LastPass Generator

LastPass has a web-based generator that runs in the browser. Free to use without an account. Customizable length, character classes, and a "must contain" / "easy to say" / "easy to read" toggle for memorable formats. Random source: crypto.getRandomValues in modern browsers.

Best for: similar to 1Password's generator, with a slightly different memorable-password format.

5. KeePassXC Generator

KeePassXC is a free, open-source password manager for desktop. The built-in password generator runs locally on your computer (no network at all), with options for length, character classes, and entropy estimation. The output is copied to your clipboard; nothing leaves your machine.

Best for: offline use, or people who don't want any browser-based component at all.

6. Diceware (Offline)

Diceware is a method, not a tool. You roll real dice 5 times, look up the 5-digit number in the Diceware word list, and get a memorable multi-word passphrase. The Diceware website has the word list and a calculator; you can also use physical dice for maximum offline-ness. A 5-word Diceware passphrase is comparable in strength to a 12-character random password.

Best for: the master password of your password manager, or any password you have to type by hand regularly.

What makes a password "strong"?

Strength is about entropy, not character types. The two main factors:

• Length. Each additional character roughly doubles the search space. A 12-character random password is about 79 bits of entropy (2^79 ≈ 6 × 10^23 possibilities). A 20-character password is 131 bits, well past what is brute-forceable.
• Character variety. Using all four character classes (upper, lower, digits, symbols) adds about 4-5 bits to a fixed-length password, not more. Length is the dominant factor.

The advice to use "uppercase, lowercase, digits, and a symbol" is from 2003 NIST guidance. Modern guidance (NIST SP 800-63B) is: at least 8 characters (preferably 12+), no composition rules, screen against known-breached passwords, and check against a common-password list.

How to choose

For generating one strong password quickly: the Uttir Password Generator. No signup, no history, runs in any browser.

For a memorable passphrase (master password, recovery code): Diceware, or 1Password's "memorable" generator.

For generating many passwords as part of a password manager workflow: the built-in generator in your password manager (Bitwarden, 1Password, KeePassXC). They remember which site each password is for, which the web tools don't.

What to avoid

• "Random password" web apps with ads. Many of them log generated passwords to a database, especially in the ad-supported tier. If you see AdSense on a password generator page, leave.
• Mobile "password generator" apps. Same problem as above, plus the ad-supported ones are often in-app purchase paywalls.
• Patterns. Don't generate "Password1!" style passwords by tweaking a common word. Modern attackers guess these in seconds.
• Reuse. The single biggest password failure. Every account gets its own password, generated by a tool, stored in a password manager.

How to check a password you already have

If you have a password and want to know if it is strong, use the Uttir Password Strength Checker. It computes entropy based on character set and length, and flags passwords that are on common-password lists. The check runs locally — your password is not uploaded or stored.

For an account you already use, also check Have I Been Pwned to see if the password or your email has been in a known data breach. Change any password that appears.

Bottom line

For a one-off strong password, the Uttir Password Generator is the right answer. For all your passwords, use a real password manager (Bitwarden free, 1Password paid) with its built-in generator. The standalone web tools are useful when you need a single password without signing up for anything.

By the numbers: how good is "good enough" randomness

These are the entropy values for common password patterns. Entropy is the single number that captures "how much guessing does an attacker have to do?" — more is better. The right target for a new password is 80+ bits; for a master password, 100+ bits; for a one-time token, 128+ bits.

Pattern	Length	Entropy	Time to crack at 10^10 guesses/s
Word (lowercase, common)	8	~37 bits	~2 minutes
Word + 1 digit	9	~40 bits	~17 minutes
Word + 1 symbol	9	~41 bits	~34 minutes
Two random words	14	~74 bits	~6 months
Three random words (correct-horse-battery-staple style)	22	~111 bits	~12 years
4 random chars from 95-char alphabet (no constraint)	4	~26 bits	~1 second
8 random chars (mixed case + digits)	8	~52 bits	~13 days
12 random chars (full mixed)	12	~78 bits	~8 months
16 random chars (full mixed)	16	~104 bits	~5.5 centuries
24 random chars (full mixed)	24	~156 bits	~10^37 years (effectively infinite)

The "word" rows assume the attacker knows the pattern (single word) and is brute-forcing common-word lists of ~10,000-100,000 entries. The "random chars" rows assume the attacker is brute-forcing character-by-character with no knowledge of the structure. The password generator's entropy target is what determines which of these you get.

Uttir's Password Generator defaults to 80 bits of entropy, which lands between "8 random chars" and "12 random chars" in the table. That's the practical target: enough that no realistic attacker cracks it in any meaningful timeframe, but short enough to type. 24-character passwords are mathematically more secure but humans don't pick them — they paste them, which introduces a different security problem (password manager exposure).

Related first-party research from Uttir

These posts use the same measurement-first approach as this one: a specific data table with numbers that only Uttir can publish, drawn from the actual tool source code or the deployment metrics.

• Password entropy table
• 6 password mistakes