Free · No sign-up · Runs in your browser
Free Password Generator.
Create a strong, random password — or a memorable passphrase — using your browser’s own secure randomness. Nothing typed or generated here ever leaves your device.
Not uploaded — nobody sees it Cryptographically random Unlimited passwords No subscription or account
Type
Length
16
Include
Strength: —
Your password is never uploaded — it’s generated right here using your browser’s built-in secure randomness. It never reaches a server, so we never see it, copy it or store it.
More handy tools
See all tools
AI DebateSuggest a subject and watch nine AI models argue it out.
QR Code GeneratorMake a free QR code.
Word CounterCount words, characters and reading time.
CSV to JSONConvert CSV to JSON, or JSON to CSV.
Text to SpeechHave your browser read text aloud.
Barcode GeneratorGenerate a printable 1D barcode.
Color PickerPick a color and get its HEX, RGB and HSL codes.
Unit ConverterConvert length, weight, temperature and more.
Lorem Ipsum GeneratorGenerate placeholder text by paragraph, sentence or word. At a glance
Password generator: quick facts
Make a strong random password or an easy-to-remember passphrase.
Updated
- Price
- Free, no sign-up, no limits.
- Types
- Random characters with adjustable length and sets, or a passphrase of random words.
- Randomness
- Your browser’s cryptographically secure Web Crypto generator.
- Passphrases
- Words from a 256-word list, each adding about 8 bits of strength.
- Privacy
- Made in your browser. Nothing is sent, saved or seen by Altto.
How it works
How to generate a strong password
Choose random characters, from 6 to 64 long, or a passphrase of 3 to 10 words, tick the extras you want, and a fresh password appears with every click, along with a strength rating.
- 01
Pick random characters or a passphrase
Whichever suits where the password is going.
- 02
Adjust the options
Length or word count, character types, separator.
- 03
Copy it
One click copies it to your clipboard.
Tips
Tips for passwords you’ll actually use
A strong password only protects you if it’s used in the right way.
- Go for lengthEvery extra character multiplies the number of guesses an attacker needs. For accounts that matter, 16 or more random characters, or a passphrase of five words or more, is a sensible target.
- Use a passphrase for anything you typePasswords you type yourself, such as your computer login or the master password for a password manager, are far easier as a passphrase like Tiger-Meadow-Amber. Random characters suit accounts your password manager fills in.
- Protect your email firstYour email account can reset almost every other password you have, so give it your strongest unique password and switch on two-step verification.
- Site rejecting it? Adjust and regenerateSome sites insist on a symbol, others ban certain ones or cap the length. If a password is rejected, untick Symbols or shorten the length to the site’s limit and generate a new one.
Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works
3 words
chosen at random is the UK National Cyber Security Centre’s advice for a password that’s both strong and memorable. The passphrase option picks them for you.
FAQ
Frequently asked questions
How the generator works, and how to use the passwords it makes. Our guide on how to create a strong password goes into more detail.
How random is this?
Passwords are generated using your browser’s built-in Web Crypto API (
crypto.getRandomValues), the same cryptographically secure source used by browsers themselves — not a predictable JavaScript Math.random().Is my password sent anywhere or saved?
No — nothing is ever uploaded. It’s generated entirely inside this browser tab, on your device. There’s no server involved at all, so Altto has no way to see, copy or store what you generate here.
What's the difference between random characters and a passphrase?
Random characters (like
xK9$mPq2#vL7n) pack the most randomness into the fewest characters. A passphrase (like Tiger-Meadow-Amber-47) uses several unrelated words instead — longer to type but far easier to read out, remember or type on a phone, while still being genuinely hard to guess.How strong is a passphrase, really?
This tool picks each word at random from a fixed list of 256 words, so every extra word adds a known, fixed amount of randomness — regardless of which words happen to come up. Each word from the 256-word list adds about 8 bits, so a 5-word passphrase is only about as strong as a random 6- or 7-character password; for anything important, use 7 or more words (the strength meter shows Strong from 7).
What makes a password strong?
Length matters more than complexity — a longer password using fewer character types is often stronger than a short one using all of them. The strength label here is a simple, general guide, not a guarantee against every attack.
Should I reuse a generated password?
No — use a different password for every account, and consider a password manager to store them so you don’t have to remember each one.
Why does my password sometimes look similar to the last one?
It doesn’t — each click generates a fresh, independent password. Similar-looking runs of letters or numbers can occasionally happen by chance, just as they can with any random string.
Where should I keep my passwords?
In a password manager, such as the one built into your phone or browser, or a dedicated app. It fills them in for you, so every account can have its own long, random password without you remembering any of them. Notes apps and spreadsheets aren’t built to keep them safe.
Should I change my passwords regularly?
Not on a timetable. Current advice, including the NCSC’s, is to change a password when there’s a reason: a site reports a breach, you’ve shared it, or you think someone else knows it. Forcing regular changes tends to push people towards weaker, predictable passwords.
What if a site says my password is too long?
Some sites still cap passwords at 20 characters or fewer. Move the length slider down to their limit and generate a new one. It’s also worth switching on two-step verification for that account, if it’s offered, to make up for the shorter password.
More tools