Are Online Password Generators Safe? A Plain-English Answer
The short answer: a good online generator is safe — if it creates your password entirely inside your own browser and never sends it anywhere. The simple test is this: load the page, switch off your internet, and try to generate a password. If it still works, the password is being made on your device, not on someone's server.
It's a completely reasonable thing to wonder. You're about to trust a website with one of the most sensitive things you own — the key to your accounts. Let's unpack what makes a generator trustworthy, what the warning signs are, and how to check for yourself in under a minute.
The one question that matters: where is the password made?
Every password generator falls into one of two camps, and the difference is everything.
1. Local generators (the safe kind)
These do all their work in your browser using a small piece of JavaScript. The website sends you the recipe, your device cooks the meal, and the finished password never travels back across the internet. There's no server log, no database, nothing to intercept and nothing to leak. PassphraseMaker works exactly this way.
2. Server-side generators (the risky kind)
These send your request to a remote computer, which makes the password and sends it back. Even if the people running it are honest, your password has now travelled over the network and possibly passed through their logs. You're trusting strangers and their security with your secret. That's a risk worth avoiding.
Try it yourself: open the generator, then turn off Wi-Fi or unplug your network cable. Generate a password. If it still appears, you're using a local generator and the result never left your device. If it fails, be cautious.
Good randomness matters too
Making a password locally is only half the story. The other half is how random that password really is. Computers can produce two kinds of randomness: ordinary "good enough for a card game" randomness, and cryptographically secure randomness designed to be unpredictable even to a determined attacker.
A trustworthy generator always uses the secure kind. In a web browser that means a built-in function called crypto.getRandomValues. If a tool quietly uses the ordinary kind, a clever attacker can sometimes narrow down the possibilities. It's the difference between shuffling a deck properly and just cutting it once.
Under the hood here: PassphraseMaker uses crypto.getRandomValues together with a technique called rejection sampling, which removes a subtle bias that can creep in when you turn random numbers into word choices. The result is words picked with genuinely even odds — no thumb on the scale.
A quick trust checklist
Before relying on any online generator, run through these:
- Does it work offline after loading? If yes, generation is local. This is the big one.
- Does it clearly say nothing is sent or stored? Honest tools state this plainly.
- Is the connection secure (the address starts with https)? This protects the page itself from tampering on the way to you.
- Does it mention secure randomness? A good sign the makers know what they're doing.
- Is it free of pushy upsells and scare tactics? Tools that sell fear often cut corners elsewhere.
What about my password manager's built-in generator?
If you already use a reputable password manager, its built-in generator is an excellent option — arguably the best. It creates the password and stores it in your vault in a single private step, so the new password never even needs to be copied and pasted. For one-off needs, or for making a memorable master passphrase, a good local generator like this one does the job nicely.
New to all this? My guide to passphrases made easy explains how to build a strong, memorable phrase you can use as that all-important master password.
The bottom line
Online password generators are not automatically dangerous — but they're not automatically safe either. The deciding factor is whether the password is born and stays on your own device. Use the offline test, check for honest privacy wording, and you can generate strong passwords with confidence. And if you ever learn that a service you use has been breached, my calm action plan will walk you through the next steps without the panic.
Frequently asked questions
Are online password generators safe to use?
Many are, as long as the generator runs entirely in your browser and never sends your password to a server. A good sign is that it keeps working with your internet disconnected after the page loads.
How can I tell if a generator runs locally?
Load the page, then turn off your internet connection and generate a password. If it still works, the generation is happening on your device. Reputable tools also say plainly that nothing is sent or stored.
Does a password generator need to use crypto-grade randomness?
Yes. A trustworthy generator uses the browser's cryptographically secure random function rather than ordinary, predictable randomness. PassphraseMaker uses crypto.getRandomValues with rejection sampling.
Is it safer to use my password manager's built-in generator?
A reputable password manager's built-in generator is an excellent choice because it creates and stores the password in one private step. A good in-browser generator is also fine for one-off needs.
Generate one safely, right here
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