Password Generator
Generate cryptographically secure passwords entirely in your browser. No passwords are ever sent to a server.
- Runs in your browser
- No upload, no tracking
- Free forever
How it works
A secure password generator creates random passwords from a cryptographically strong source of randomness — here, the browser's crypto.getRandomValues() API — rather than predictable patterns a human might pick. You control the length and which character sets are included, and a live strength meter scores the result. Everything runs locally, so generated passwords never leave the page. It is built by JusDB, a managed database operations team, alongside the rest of its developer utilities.
- 1
Set the length
Drag the slider or type a value from 4 to 128 characters. Longer is stronger; 16+ is recommended for important accounts.
- 2
Pick character sets
Toggle uppercase, lowercase, numbers and symbols to match each site's rules and maximise entropy.
- 3
Generate
Choose a count of 1, 5 or 10, then click Generate. The strength meter rates the first result from weak to strong.
- 4
Copy
Copy any single password from its row, or use ‘Copy all’ for the full batch. Clear wipes them from memory.
Frequently asked questions
- Are the generated passwords truly random?
- Yes. The tool uses the browser's crypto.getRandomValues() API, which provides cryptographically secure random values suitable for generating passwords.
- Are my passwords stored or sent anywhere?
- No. Passwords are generated entirely in your browser. Nothing is transmitted to JusDB or any server — the passwords exist only in your browser's memory until you close the tab.
- What does the strength indicator measure?
- It scores length (8+, 12+, 16+) plus the presence of uppercase, lowercase, numbers and symbols. A score of 6–7 is "strong", 5 is "good", 3–4 is "fair", and below that is "weak".
- How long should my password be?
- Security experts recommend at least 12 characters for most accounts and 16+ for high-value accounts. The tool defaults to 16 characters and supports any length from 4 to 128.
- Which character sets can I include?
- You can toggle uppercase (A–Z), lowercase (a–z), numbers (0–9) and symbols (!@#) independently. Including more character sets increases entropy and raises the strength score.
- Can I generate several passwords at once?
- Yes. Choose a count of 1, 5 or 10 before clicking Generate. When more than one is generated, a ‘Copy all’ button copies the whole batch as newline-separated values.
Choosing and managing passwords that actually hold up
The strength of a password comes down to one number: entropy, measured in bits. Each character drawn from a random pool adds roughly log2(poolSize) bits, so a 20-character string from a 94-symbol set carries about 131 bits of entropy — more than enough that no realistic offline attack could exhaust it before the heat death of the universe. The practical lesson is that length is the dominant lever. Adding a single character multiplies the search space, while swapping one letter for a symbol barely moves it.
Length beats complexity
A 16-character lowercase password has more entropy than an 8-character password that mixes every class of symbol, yet it is far easier to read and type. Mandatory complexity rules (“must contain a symbol”) tend to push people toward predictable substitutions like P@ssw0rd! that attackers model explicitly. Favour raw length, and only widen the character set when a site rejects a longer value.
Charset choices and where they trip you up
Widening the pool to uppercase, lowercase, digits and symbols pushes per-character entropy from about 5.7 bits (lowercase only) to roughly 6.6 bits (full ASCII printable). The catch is portability: some legacy systems silently truncate at a length limit or choke on characters such as >, & or a backslash. If a login mysteriously fails, regenerate with symbols disabled before assuming the password itself is wrong.
Passphrases vs random strings
Random strings maximise entropy per character but are miserable to recall, which is fine when a password manager remembers them for you. For the handful of secrets you must type from memory — your manager's master password, a disk-encryption key — a passphrase of five or six unrelated words wins. Six words from a 7,776-word list yields about 77 bits, comfortably strong, and you can actually remember it. Use random strings everywhere a machine does the remembering, passphrases where a human must.
Uniqueness, managers and credential rotation
The single highest-impact habit is a unique password per service, so one breached site cannot unlock the rest through credential-stuffing. That is only practical with a password manager generating and storing each value. The same discipline applies to infrastructure: when you mint a database role or service account, generate a long random secret, store it in a vault rather than a config file, and rotate it on a schedule or immediately after anyone with access leaves. For credentials you intend to store as hashes rather than recover, pair this tool with our bcrypt generator or hash generator. If you run production data stores, JusDB's managed database service can handle secret rotation and access policy for you.
Why client-side generation matters: this tool draws every character from the browser's crypto.getRandomValues(), a cryptographically secure source — never Math.random(), whose output is predictable and unsafe for secrets. Because generation happens entirely in your browser, nothing is transmitted, logged or stored on any server, so even a compromised network cannot observe the password you just created.