NTLM Hash Generator

Generate NTLM and NTLMv2 hashes from passwords with our secure online tool

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NTLM & NTLMv2

Generate both classic NTLM and more secure NTLMv2 hashes

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Instant Results

Get your NTLM hash immediately with client-side processing

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1-Click Copy

Copy generated hash to clipboard with a single click

🔒 Client-Side Processing
All hashing is done in your browser using JavaScript. Your passwords never leave your device, ensuring maximum privacy and security.

Hash Type:

Enter password to hash

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💡 For developers: Generate NTLM hashes with:

echo -n "password" | iconv -f UTF8 -t UTF16LE | openssl dgst -md4

# Generate NTLM hash using OpenSSL

python -c "import hashlib; print(hashlib.new('md4', 'password'.encode('utf-16le')).hexdigest())"

# Generate NTLM hash using Python

About NTLM Hash Algorithm

NTLM (NT LAN Manager) is a suite of Microsoft security protocols that provides authentication, integrity, and confidentiality to users. The NTLM hash is the cryptographic representation of a user's password used in the NTLM authentication protocol.

NTLM Hash Characteristics

• Based on MD4 hash algorithm
• Password is converted to UTF-16LE before hashing
• Produces 128-bit (16-byte) hash value
• Typically represented as 32-character hexadecimal string
• Case-insensitive password handling

NTLMv2 Improvements

• Uses HMAC-MD5 for enhanced security
• Includes timestamp to prevent replay attacks
• Uses client and server challenges
• More resistant to precomputation attacks

⚠️ Security Warning: NTLM hashes are vulnerable to pass-the-hash attacks and rainbow table attacks. NTLMv2 provides better security but should be replaced with Kerberos authentication where possible. Always use strong, complex passwords to mitigate these risks.

NTLM Authentication Process

The NTLM authentication protocol involves a challenge-response mechanism:

Negotiation

Challenge

Authentication

Client sends negotiation message

Server responds with challenge

Client responds with challenge response

NTLM vs NTLMv2 Comparison

Feature	NTLM	NTLMv2
Hash Algorithm	MD4	HMAC-MD5
Password Encoding	UTF-16LE	UTF-16LE
Security Level	Weak	Moderate
Replay Attack Protection	No	Yes
Recommended Usage	Legacy systems only	Internal networks, when Kerberos unavailable

💡 For modern Windows environments, Kerberos authentication is strongly recommended over NTLM/NTLMv2. Kerberos provides mutual authentication and is more resistant to common attack vectors.

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