Password Strength Checker
Evaluates your password on a 5-level scale by checking length, character variety and repeated patterns, and shows the estimated brute-force cracking time. Your password is never sent or stored — it is checked only inside your browser.
- 12+ characters
- Has lowercase
- Has uppercase
- Has numbers
- Has symbols
- No repeats/sequences
How to use
- Type the password to check.
- Review the strength level, estimated cracking time and checklist.
- Fix the missing items to make the password stronger.
Frequently asked questions
Is my password sent anywhere?
No. All checking happens inside your browser; the input is never sent to a server or stored.
How is the cracking time estimated?
It converts the password's entropy into time against an attacker guessing 10 billion times per second. Actual safety also depends on the site's security.
What makes a strong password?
12+ characters mixing upper/lowercase, numbers and symbols, with no sequences or repeated patterns.
Practical example and verification criteria
Password Strength Checker: First identify whether the source is plain text, a URL component, JSON, CSV, CSS, JavaScript, a color, or a token, then check character encoding, delimiters, quoting, and line-ending rules. Encoding is not encryption, decoding is not signature verification, and minification is not code optimization; define the required output format and destination before running the tool.
Password Strength Checker: For a quick check, start with password vs 16-char random phrase as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
Password Strength Checker: Put the output into the target browser, build tool, API, or design surface and check for parsing errors or changed meaning. Decoding does not prove authenticity, a hash cannot be decrypted, and minified code is not guaranteed to behave like the source. Preserve the original and tests, and avoid entering passwords, tokens, or personal data.
Password Strength Checker · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
Password Strength Checker · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
Password Strength Checker · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.