Secure Password Generator & Strength CheckerCreate secure passwords and check their strength in real time

This tool displays the "time required for cracking," assuming an offline attack using a slow hash algorithm (10,000 attempts per second).
Please note that this is only a guideline and may vary under different attack conditions (see reference items below). Always set a sufficiently strong password that is hard to guess under any conditions.

This tool uses the password strength evaluation library "zxcvbn.js" developed by Dropbox to provide estimated analysis time and improvement advice.

Features

Detection of Common Patterns

Detects patterns such as repeated strings and word combinations, including:

• Words in dictionaries
• Common phrases and slang
• Numeric patterns such as dates and phone numbers

Resistance to Attack Methods

Estimates computational cost based on the number of attempts required for attacks like dictionary attacks and keyboard patterns.

Evaluation Based on Real-World Databases

Analyzes commonly used passwords based on past leaked password databases.

Compared to password strength checkers that only evaluate length and the presence of symbols, this tool provides a more realistic and reliable assessment.

Score Evaluation

Password strength is rated on a scale of 1 to 5:

• 1. Very Weak: Very short or commonly used password
• 2. Weak: Similar to commonly used passwords
• 3. Fair: Contains easily guessed patterns
• 4. Strong: Hard-to-guess password
• 5. Very Strong: Very hard-to-guess password

Provided Information

Estimated Cracking Time:

Displays the time it might take to crack the password in units such as seconds, minutes, or years.

Weakness Identification:

Provides specific feedback on why the password is weak (e.g., use of dictionary words, keyboard patterns).

Suggestions for Improvement:

Offers suggestions to strengthen the password (e.g., adding one or two more words).

Notes

Passwords generated or checked by this tool are not sent to the server and are processed securely.

Even if a password is rated as "strong" by this tool, it does not guarantee complete security.

This site does not guarantee password safety or prevention of misuse.

This site is not responsible for any damages or disadvantages resulting from the use of this tool.

For safer operation, we recommend using the following in combination:

• Password management tools: Generate and manage random, strong passwords.
• Multi-factor authentication: Enhance security by adding additional authentication methods to passwords.