Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.
What Is a Hash and What Is It Used For?
A cryptographic hash function takes input data of any length and produces a fixed-size string of characters that uniquely represents that data. Common hash algorithms include MD5, SHA-1, SHA-256, and SHA-512. Hashes are used for data integrity verification, password storage, digital signatures, and checksums for file downloads.
How Do I Generate a Hash Online?
Type or paste your text into the input area. The tool instantly generates hash values using multiple algorithms: MD5, SHA-1, SHA-256, and SHA-512. Copy any hash with a single click. All hashing is performed in your browser using the Web Crypto API — your data never leaves your device.
Which Hash Algorithm Should I Use?
SHA-256 is the best general-purpose choice for security applications. MD5 and SHA-1 are considered cryptographically broken for collision resistance but are still used for non-security checksums. SHA-512 provides even more bits but is slower and rarely needed. For file integrity checks, SHA-256 is the modern standard.
Is It Safe to Hash Sensitive Data in This Tool?
Yes. The hashing runs entirely in your browser using JavaScript. Your input text is never transmitted to any server. This makes the tool safe for testing password hashes, verifying checksums, and working with sensitive data. No data is logged or stored.
What Is the Difference Between MD5, SHA-1, and SHA-256?
MD5 produces a 128-bit (32 hex character) hash and is fast but cryptographically broken — collisions can be manufactured. SHA-1 produces a 160-bit (40 hex character) hash and is also considered insecure for cryptographic purposes. SHA-256 produces a 256-bit (64 hex character) hash and remains secure. For any security-sensitive application, SHA-256 is the minimum recommended algorithm.
Can I Reverse a Hash Back to the Original Text?
Cryptographic hash functions are one-way by design — you cannot mathematically reverse them. However, attackers use pre-computed lookup tables (rainbow tables) to find common inputs for given hashes. This is why passwords should be hashed with salts and specialized algorithms like bcrypt, not plain SHA-256. This tool is for generating hashes, not cracking them.