Independent draws create the password space
Every position is sampled independently from the deduplicated allowed character set, using browser cryptographic randomness when it is available. With 63 allowed characters and length 16, the nominal search space is 63^16 combinations, about 6.2 × 10^28. Repetition is allowed here on purpose: forbidding repeated characters would reduce the possible passwords and change the model.
Reading a length calculation
For a 16-character password drawn from 63 symbols, each position carries log2(63), about 5.98 bits, for roughly 95.7 bits before considering any external system rules. Changing to an eight-character password cuts that estimate to about 47.8 bits; doubling length is far more consequential than swapping one punctuation mark for another. Store the displayed string in a password manager rather than trying to memorize it.
Character policy is not account security
Some services reject symbols, impose a maximum length, or require a particular category. If a site permits only letters and digits, remove prohibited characters before generating and then verify the accepted result. A password generator cannot tell whether a website hashes credentials correctly, has been breached, or supports multi-factor authentication; those are separate protections.
Never use a sample as a secret by itself
A password shown in a browser should be copied directly into the intended account and not posted, emailed, or reused elsewhere. This tool cannot recover a lost password, rotate credentials across accounts, or create an encryption key with a documented protocol. For high-value systems, follow the organization’s approved password and recovery policy.
Estimate only the generation space
The bit estimate describes possible strings under the selected alphabet and length; it is not a prediction that an account is safe. Online rate limits, breach monitoring, password-manager storage, and multi-factor authentication alter the practical risk. Treat the calculation as a reason to prefer sufficient length, then follow the service’s security controls as well.
Generate after choosing the destination
Open the account or password manager first, generate one value, save it immediately, and confirm that the service accepts it. Generating a pile of passwords in advance invites copying, reuse, or loss. The important unit is one distinct credential tied to one account and a recoverable storage process.
Questions about generated credentials
Why may a password repeat a character?
Independent positions preserve the full character-set model.
Should I reuse a generated password?
No, use a unique password for each account.
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