Password Generator
A password generator is a tool that produces a random sequence of characters intended to be hard for an attacker to guess and impractical for them to crack by brute force. The ToolzPedia Password Generator creates passwords entirely inside your web browser using the cryptographically-secure window.crypto.getRandomValues() API. No password you generate here is ever transmitted, logged, or stored on any server, it exists only in the memory of the browser tab that created it.
A common misconception is that "complex-looking" passwords (e.g. P@ssw0rd!) are strong. They are not, modern offline crackers chew through them in seconds because they follow predictable transformations of dictionary words. What actually defeats a cracker is entropy: the number of equally-likely possibilities the password could have been. A 16-character password drawn uniformly from the full printable ASCII set has roughly 105 bits of entropy, which is enough to resist all currently practical offline attacks even after several decades of Moore's-law improvement to hardware.
The generator below lets you choose length and which character classes to include, then produces passwords that meet (or exceed) NIST SP 800-63B guidance for high-value accounts. It also includes a passphrase mode for situations where you will need to type the password manually, passphrases of four or more random words are easier to type accurately on mobile and easier to read aloud to a partner, while still providing 50+ bits of entropy.
Use the tool edit
How to use Password Generator edit
Follow these steps to use the tool:
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Choose a type
Pick Random for maximum security, Memorable for something easier to type, Passphrase for word-based, or PIN for digits only.
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Set length and options
Use a preset (Easy → Insanely strong) or fine-tune length and character types yourself.
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Generate
Hit Generate and instantly get one or many passwords, up to 500 at once.
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Copy or download
Copy individual passwords with one click, copy them all, or download the full list as a .txt file.
Details edit
Passwords are generated by your browser using window.crypto.getRandomValues(). Nothing is uploaded, logged, or stored. The download button creates the file locally with the Blob API.
For accounts you care about, pair generated passwords with a reputable password manager and two-factor authentication.
Frequently asked questions edit
Use cases edit
Generate a unique 20-character password for every new service you sign up to. Paired with a password manager, this means a breach at one site cannot affect any other account you hold.
If you have been using one password across multiple sites, generate a fresh unique password per site and replace them one by one, starting with email and banking.
Use passphrase mode to generate something like <code>cinnamon-anchor-orbit-veneer</code>, easy to read aloud to guests, hard to brute force.
For machine-to-machine credentials that are stored in a vault and never typed, use 32+ random characters from the full set.
When sending a sensitive file via a service that requires a password, generate a one-time string here rather than reusing anything from a real account.
How it works edit
When you click Generate, the tool calls crypto.getRandomValues(), which is the browser's interface to the operating-system entropy pool. On macOS and Linux this comes from /dev/urandom; on Windows it comes from BCryptGenRandom. These sources are designed for cryptographic use and are continuously reseeded from physical noise (mouse movement, network jitter, disk timing).
For each character position in the requested length, the tool draws a random integer modulo the size of the chosen alphabet and indexes into that alphabet. Importantly, the implementation uses a rejection-sampling approach: any random integer that would cause uneven distribution (due to the size of the alphabet not dividing the random range evenly) is discarded and a fresh integer is drawn. This guarantees that every character in the output is uniformly distributed, which is what makes the entropy claim valid.
Passphrase mode draws words from the EFF "long" wordlist (7,776 words). Each randomly-chosen word contributes log₂(7776) ≈ 12.9 bits of entropy, so a four-word phrase has roughly 51.6 bits, about the strength of an eight-character random ASCII password, but far easier for a human to remember and type.
Tips and best practices edit
- Always store generated passwords in a password manager (Bitwarden, 1Password, KeePassXC, or your browser's built-in one). The whole point of generated passwords is that you do not memorise them.
- For accounts you must type into a phone keyboard frequently, use the passphrase mode, typo rates are dramatically lower than for symbol-heavy random strings.
- Length matters more than symbol variety. A 24-character password with only lowercase letters is stronger than a 10-character password with mixed case, digits, and symbols.
- Do not "personalise" a generated password (e.g. by appending your initials or a memorable year). Every such modification reduces entropy and undoes the whole point of generating it randomly.
- For high-value accounts (primary email, banking, password manager itself), pair the generated password with a hardware security key or TOTP app for two-factor authentication.
Common mistakes edit
The entire benefit of randomness is per-account isolation. A reused password is only as strong as the weakest site that holds it.
A 30-character random password in <code>passwords.txt</code> on the desktop is, from an attacker's perspective, no different from <code>password123</code>. Use a vault.
A random string is not memorable by design. If you need something to memorise (e.g. the master password for your vault), use passphrase mode with six or more words.
If a site refuses passwords longer than 12 characters, take it as a sign their security practices may be poor and consider what data you store there.
Comparison edit
How different password styles compare for an offline attacker with modern hardware (rough estimates, actual numbers depend on the hash function and attacker's budget):
| Style | Example | Entropy | Time to crack (offline) |
|---|---|---|---|
| Common word + symbols | P@ssw0rd! | ~14 bits | Under 1 second |
| 8 random lowercase | kqfmwxzj | ~38 bits | Hours |
| 12 random mixed | Kq8mWx#zJ4!q | ~78 bits | Millions of years |
| 16 random mixed | 20+ chars from this tool | 105+ bits | Indistinguishable from impossible |
| 4-word passphrase | cinnamon-anchor-orbit-veneer | ~52 bits | Centuries |
Related tools edit
Other free utilities available on ToolzPedia:
QR Code Generator
Create QR codes for URLs, Wi-Fi, vCards, email, SMS and more. Download as PNG or SVG.
Palworld Breeding Calculator
Predict offspring from any two Pals or find every parent pair that produces a target Pal.
See also edit
- All utilities on ToolzPedia
- All tools, every utility in the encyclopedia
- Tutorials and guides related to utilities
- Report a bug or request a feature