A hash is a fixed-length string generated from any input using a mathematical algorithm. The same input always gives the same hash. MD5 produces 32-character hashes. SHA-256 produces 64-character hashes. Hashes are used for password storage, file verification, and data integrity checking — you cannot reverse a hash to get the original input.
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🔑 Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hash values for any text. Perfect for checking data integrity, verifying files, generating checksums, and understanding cryptography.
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✅ Trusted Tool
The 365tool.net Hash Generator uses the browser's built-in Web Crypto API — your text never leaves your device. Free for developers, security researchers, and anyone learning cryptography. No sign-up needed.
🤔 How Does This Work?
The Hash Generator uses the browser's built-in Web Crypto API:
Your text is encoded to UTF-8 bytes
The Web Crypto API applies the selected SHA algorithm
The result is converted from binary to hexadecimal string
Nothing is sent to any server — all processing happens in your browser
Note: MD5 is not available in Web Crypto API as it is not considered secure. Use SHA-256 for security needs.
❓ Frequently Asked Questions
What is a hash and what is it used for?▼
A hash function converts any data into a fixed-length string. Uses: password storage (store hash not password), file integrity verification (has a file been tampered with?), checksums (verify downloads), digital signatures, and blockchain (each block contains hash of previous block). SHA-256 is used in Bitcoin.
Is MD5 still secure?▼
No! MD5 is cryptographically broken — collisions (two different inputs with same hash) have been found. Do not use MD5 for security-sensitive applications. For security: use SHA-256 or SHA-512. MD5 is still fine for non-security uses like quick checksums or file naming.
Can a hash be reversed?▼
No — hashing is a one-way function. You cannot mathematically reverse a hash to get the original input. However, if someone has a list of known inputs and their hashes (rainbow table), they can look up common passwords. This is why strong unique passwords are essential.
What is the difference between SHA-256 and SHA-512?▼
SHA-256 produces 256-bit (64 hex character) hashes. SHA-512 produces 512-bit (128 hex character) hashes. SHA-512 is stronger but produces longer output. Both are currently considered cryptographically secure. SHA-256 is the most widely used (Bitcoin, TLS certificates, code signing).
What is a salt in hashing?▼
A salt is random data added to a password before hashing. This ensures that even if two users have the same password, they get different hashes. It also makes rainbow table attacks ineffective. Modern password storage always uses salted hashes with algorithms like bcrypt or Argon2.
A hash function converts any data into a fixed-length string. Uses: password storage (store hash not password), file integrity verification (has a file been tampered with?), checksums (verify downloads), digital signatures, and blockchain (each block contains hash of previous block). SHA-256 is used in Bitcoin.
Is MD5 still secure?▼
No! MD5 is cryptographically broken — collisions (two different inputs with same hash) have been found. Do not use MD5 for security-sensitive applications. For security: use SHA-256 or SHA-512. MD5 is still fine for non-security uses like quick checksums or file naming.
Can a hash be reversed?▼
No — hashing is a one-way function. You cannot mathematically reverse a hash to get the original input. However, if someone has a list of known inputs and their hashes (rainbow table), they can look up common passwords. This is why strong unique passwords are essential.
What is the difference between SHA-256 and SHA-512?▼
SHA-256 produces 256-bit (64 hex character) hashes. SHA-512 produces 512-bit (128 hex character) hashes. SHA-512 is stronger but produces longer output. Both are currently considered cryptographically secure. SHA-256 is the most widely used (Bitcoin, TLS certificates, code signing).
What is a salt in hashing?▼
A salt is random data added to a password before hashing. This ensures that even if two users have the same password, they get different hashes. It also makes rainbow table attacks ineffective. Modern password storage always uses salted hashes with algorithms like bcrypt or Argon2.