Open Source Password Generator

Look for use of the operating system randomness source or a cryptographic random number generator, not a homegrown formula based on time, mouse movement, or a simple pseudo-random library. The tool should make length or word count explicit and should not imply that adding one symbol fixes a short password. For passphrases, the word list size matters as much as the number of words.

Passphrases are easier to type and read over the phone, especially for disk encryption, Wi-Fi, and shared recovery procedures. Random character passwords are better for accounts where a password manager can fill the value and the site accepts long strings. The deciding factor is entropy at a usable length. Four common words are weak; several words chosen uniformly from a large list can be strong.

Only if generation happens locally in your browser and you trust how the page was delivered. A server-side generator can see the secret before you do, which defeats the point for account passwords. Safer choices are offline apps, command line tools, or static web pages you can save and verify. Avoid any generator that logs history, phones home during generation, or mixes passwords with ads.

Self-hosting mainly controls delivery and network exposure. It does not automatically make the generated passwords stronger. You still need client-side generation, trusted dependencies, tight transport security, and a plan for updating the hosted files. In a company, self-hosting can help standardize policies and avoid public websites, but it also creates an internal service that someone must patch, monitor, and document.

No. For most use cases, internet access is unnecessary and undesirable during generation. A desktop app, mobile app, or CLI tool can use local system randomness without contacting a service. Offline operation is useful when creating recovery passwords, break-glass credentials, or secrets during an outage. If a tool requires connectivity, understand whether it is fetching code, syncing policy, checking updates, or generating on a server.

Use saved policy profiles rather than asking people to remember every exception. Real systems impose conflicting limits on length, symbols, spaces, and Unicode characters. A generator that supports named policies can produce acceptable passwords without lowering the default for everything. Keep those policies reviewed, because old restrictions often remain after the target system changes. Document when a rule is compatibility-driven rather than security-driven.

It should not need to. A plain generator creates a candidate secret and hands it to you or to a password manager. If it keeps history, syncs generated values, or offers vault features, evaluate it like a password manager instead. Clipboard history is the common leak path, so check whether the tool can clear the clipboard and whether your operating system or remote desktop software records clipboard contents.

The safest workflow is direct creation inside the password manager or a handoff that never writes the secret to disk. If you generate separately, save the password immediately with the correct URL, username, and notes so it is not stranded in the clipboard. Avoid retyping long random strings. For teams, confirm whether the generator can match the manager's policy rules and sharing model.

A CLI helps when passwords are part of provisioning scripts, test environments, local admin accounts, or one-time recovery material. An API is useful only if the secret is generated in a trusted boundary and returned over protected channels. Be careful with shell history, process lists, CI logs, and temporary files. Many automation leaks happen after generation, not inside the random number function.

They can be, if they use platform randomness, work offline, and avoid unnecessary permissions. Mobile is useful for creating Wi-Fi passwords, device PIN alternatives, or credentials when you are away from a laptop. Watch for screenshots, clipboard sharing across devices, keyboard extensions, and cloud clipboard features. Also confirm that generated passwords can be moved into your manager without sending them through chat or email.

Independent review matters when the tool includes cryptography, browser extensions, synchronization, deterministic generation, or hosted delivery. For a small local generator, readable code and reliance on standard system randomness may be more important than a formal audit. Review should focus on random source selection, dependency risk, telemetry, clipboard behavior, and whether the interface encourages weak settings. A polished strength meter is not an audit.

Most password generators are inexpensive to run, so the licensing question is usually about redistribution, embedding, and internal modification. If you plan to ship the generator in an appliance, browser package, or company portal, confirm the license allows that use and that dependency licenses are compatible. For hosted services, cost often comes from support, packaging, or compliance work rather than the generation itself.

If it is a simple local generator using standard randomness, abandonment may be manageable for a while, but dependency and platform changes still matter. Avoid tools that use a private deterministic recipe you cannot reproduce elsewhere. Keep documented policies for length, character sets, and passphrase word lists so you can switch generators without changing every password rule. Replace any hosted generator that stops receiving security fixes.