Password Hash Strength Analyzer
Check how strong your password hashes are. This tool analyzes the hash algorithm and parameters, warning you about weak choices like unsalted MD5 or SHA-1.
Hash Algorithm Analysis
Password Strength Analysis
Password Hash Security
Not all hash algorithms are suitable for password storage. Fast hashes like MD5 and SHA-256 are vulnerable to brute-force attacks. Use specialized password hashing algorithms like bcrypt, Argon2, or scrypt that are intentionally slow and memory-hard.
How Password Hash Analysis Works
This tool does two separate analyses. First, it examines hash strings to identify which algorithm produced them—bcrypt, Argon2, SHA-256, MD5, and others each have distinctive patterns and lengths. Second, it evaluates password strength by checking length, character variety, and common patterns.
Hash identification works by matching against known formats. Bcrypt starts with$2a$ or$2b$, Argon2 with$argon2, and plain hashes are identified by their hex character length (32 for MD5, 64 for SHA-256, etc.).
Hash analysis checks:
- Prefix patterns (bcrypt, Argon2, scrypt markers)
- Hash length in hexadecimal characters
- Character set (hex only, base64, special characters)
- Known format structures (like MySQL's * prefix)
Password strength analysis checks:
- Length (under 8 is weak, 12+ is better, 16+ is strong)
- Character variety (lowercase, uppercase, numbers, symbols)
- Common patterns (qwerty, 123456, repeated characters)
- Keyboard walks and dictionary words
When You'd Actually Use This
Auditing database security
Found a user database with password hashes? Identify which algorithm was used and immediately spot if they're using broken hashes like MD5 or unsalted SHA-256 that need urgent migration.
Testing your password policy
Set up a new authentication system? Run sample passwords through the strength analyzer to verify your policy actually rejects weak passwords and accepts genuinely strong ones.
Security compliance reviews
PCI-DSS, SOC 2, and other frameworks require strong password hashing. This tool helps verify that systems use bcrypt, Argon2, or scrypt instead of deprecated algorithms.
Educational security training
Show developers why "Password123!" fails strength checks despite meeting typical policy requirements. Demonstrate how hash format reveals the underlying algorithm and its security properties.
Incident response and forensics
During a breach investigation, quickly identify what password hashing was in use. This determines how vulnerable the stolen hashes are and prioritizes remediation efforts.
Personal password evaluation
Curious if your password is actually strong? Test it here (not your real one—use a similar pattern). See what makes passwords weak and learn to create genuinely secure ones.
What to Know Before Using This Tool
Don't paste real passwords. Even though this runs locally in your browser, it's a bad habit. Type a similar test password instead of your actual credentials.
Hash identification isn't perfect. Some hashes have identical lengths (MD5 and NTLM are both 32 hex chars). The tool shows multiple possibilities with confidence levels when ambiguity exists.
Strength checkers have limits. This tool checks common patterns but can't test against leaked password databases. A password that passes here might still be in breach databases.
Hash format reveals algorithm weaknesses. If you see a plain 64-character hex hash for passwords, that's SHA-256 without proper key stretching—vulnerable to GPU cracking. Bcrypt and Argon2 formats include salt and cost parameters by design.
Quick reference: Strong password hashes start with $2a$, $2b$, $argon2, or $7$. Weak ones are plain hex strings. If you're storing passwords as raw SHA-256 or MD5, migrate immediately.
Common Questions
What makes a password hash "strong"?
Strong password hashes are slow and memory-hard. Bcrypt, Argon2, and scrypt are designed to take milliseconds per hash and use significant memory. This makes brute-force attacks impractical—even with GPUs, attackers can only try a few hundred guesses per second instead of billions.
Why is SHA-256 listed as "moderate" not "strong"?
SHA-256 is cryptographically secure, but it's too fast for password hashing. Modern GPUs can compute billions of SHA-256 hashes per second. For passwords, you want algorithms specifically designed to be slow and expensive to compute.
What does the bcrypt cost factor mean?
Bcrypt's cost factor (like $2a$12$) determines how many iterations are used. Each increment doubles the work. Cost 12 means 2^12 iterations. For new applications, use at least 12; for high-security, consider 14 or higher.
How long should passwords be?
Minimum 12 characters, ideally 16+. Length matters more than complexity. "correcthorsebatterystaple" is stronger than "Tr0ub4dor&3" despite being easier to remember. Consider using passphrases or a password manager.
What's Argon2 and why is it recommended?
Argon2 won the Password Hashing Competition in 2015. It's memory-hard (requires significant RAM), parallelizable, and has three variants: Argon2d, Argon2i, and Argon2id. Use Argon2id for passwords—it's resistant to both side-channel and GPU attacks.
Can this crack password hashes?
No. This tool only identifies hash types and evaluates password strength. It doesn't attempt to reverse hashes or perform brute-force attacks. For actual cracking, attackers use specialized tools like Hashcat or John the Ripper.
Why does my password show as weak even with symbols?
Adding symbols doesn't automatically make a password strong. "Password1!" meets typical complexity rules but is extremely common. Length, unpredictability, and avoiding patterns matter more than checking boxes for character types.
Is this tool safe for testing?
Yes—it runs entirely in your browser with no server communication. But don't test real production passwords. Use test cases that mimic your actual password patterns without exposing real credentials.
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