What is Random Password Generator?
A Random Password Generator produces a random password on demand, using a deterministic algorithm or a cryptographically strong random source. Output is generated entirely in your browser so nothing is sent to a server. Useful for creating strong unique credentials for online accounts.
Random Password Generator
Generate strong random passwords in your browser - length up to 128, mix of uppercase, lowercase, digits and symbols.
TLDR
Pick a length (8-128), tick the character classes you want, click Generate. The page uses Web Crypto to assemble a uniformly-random password from the allowed pool and shows you a strength meter that estimates how many decades a brute-force attack would take given current GPU costs.
How to use this tool
- Enter your inputs. Each field is labeled with what it expects.
- Read the result instantly. Numbers update as you type or change inputs.
- Adjust to test sensitivity. Change one input at a time to see what moves the result most.
- Cross-check the formula in the section below if you want to verify the math.
- Copy or screenshot the result for later. The site does not save anything; close the tab and inputs are gone.
About this tool + how it works
This tool runs 100% in your browser - the libraries load from a public CDN and the math runs on your device. Nothing is uploaded to a server. The underlying logic is:
pool = uppercase + lowercase + digits + symbols (per checkbox) password = N draws from pool with crypto.getRandomValues() entropy = N * log2(|pool|) bits
You can verify by opening the browser developer tools and watching the Network tab; you'll see no requests fired during normal use beyond the initial page and library load.
Real-world scenarios where this tool helps
New account signup
Skip 'P@ssw0rd!' and grab a fresh 20-char random string. Drop into your password manager.
Server / API credentials
Set rotating service-account passwords. 32+ chars with symbols beats most policy rules.
One-off shared file
Generate a strong throwaway password for a one-time-use ZIP or 1-week shared link.
Recovery codes
Generate a batch of 10-12 char alphanumeric codes for a recovery code list.
What this tool does
- Runs 100% in your browser - no upload, no signup, no logging.
- Uses crypto.getRandomValues for cryptographically-strong randomness (not Math.random).
- Lets you batch generate (1 to hundreds at a time) with one click.
- Copy-to-clipboard built in so you can paste straight into your code or spreadsheet.
- Works on phones, tablets, and desktops; loads in under a second.
- Shows a real-time strength meter (entropy bits + 'crackable in years at $1B GPU farm' estimate).
What it does NOT do
- Does not store, log, or send your output anywhere.
- Does not require an account, an API key, or a paid plan.
- Does not work as a true 'reproducible' generator - no seed control (by design, for entropy).
- Does not replace a dedicated secrets manager for production credentials.
Common mistakes and pitfalls
- Treating output as 'guaranteed unique' across sessions. Generators are stateless - check for collisions if you need uniqueness across runs.
- Using small ranges and assuming no repeats - if you ask for 1000 numbers from 1-100, you will see duplicates unless 'no repeats' is enabled.
- Copying without scroll-to-end on very large outputs - the textbox may have more lines than visible.
- Forgetting that the page is local - if you close the tab without copying, the output is gone.
Frequently asked questions
Is this password generator free?
Yes - free forever, no signup, no daily limit. Everything runs in your browser.
Where do the passwords come from?
Generated locally in your browser using crypto.getRandomValues() (cryptographically strong randomness). Nothing is fetched from a server, nothing is logged.
Can I trust the randomness?
Yes - the tool uses the Web Crypto API (crypto.getRandomValues), the same source modern password managers use. It is strong enough for tokens, IDs, and games. For high-stakes use (KDF salt, cryptographic keys), use a dedicated key derivation library.
Does it work offline?
Yes after first load. The page caches in your browser, so you can disconnect and keep generating.
Is anything saved or logged?
No. Inputs and outputs live only in your browser tab. Close the tab and they are gone. Nothing is sent to any server.
Can I generate passwords in bulk?
Yes - every generator on the page accepts a count input (typically 1 to several hundred). The tool draws each output independently from the crypto entropy pool, so bulk output has no detectable pattern.
Can I use these passwords commercially?
Yes - generated output is yours to use however you like. We claim no rights over what you generate. For production secrets you should still use a vetted secrets manager, but for tokens, IDs, mock data, and game/puzzle use, browser-generated output is fine.
How does this compare to a script I write myself?
Functionally identical for most uses - both crypto.getRandomValues() (this tool) and Python's secrets.token_hex / Node's crypto.randomBytes pull from the OS entropy pool. The difference is convenience: this is a tab away with a copy button instead of writing one-liners in a REPL.
How long should my password be?
16+ chars with all 4 classes is unbreakable for any practical attacker (centuries on a GPU farm). 20+ is overkill but free. Below 12 chars is risky.
Are these passwords stored?
No. Generated client-side, never sent to any server. Use a password manager (1Password, Bitwarden) to save them.
Why not Math.random()?
Math.random() is predictable (Mersenne Twister state can be recovered from a few outputs). crypto.getRandomValues() pulls from OS-level entropy and is suitable for passwords.