Enter text to generate cryptographic hashes:
A hash function is a mathematical algorithm that takes an input (or message) and produces a fixed-size string of bytes. The output, called a hash value or digest, is unique to each unique input. Hash functions are one-way functions, meaning it should be computationally infeasible to reverse the process and recover the original input from the hash value.
SHA-256 is part of the SHA-2 family of hash functions and produces a 256-bit (32-byte) hash value. It is widely considered cryptographically secure and is used in Bitcoin, TLS/SSL certificates, and many other security applications. SHA-256 is the current standard for most cryptographic hashing needs and offers excellent security properties.
SHA-512 is another member of the SHA-2 family but produces a longer hash value of 512 bits (64 bytes). It provides additional security margin over SHA-256 and is useful when you need maximum resistance against collision attacks. SHA-512 processes data in 1024-bit blocks and is particularly suitable for high-security applications.
SHA-1 produces a 160-bit (20-byte) hash value. While historically important and still widely used, SHA-1 has known vulnerabilities and should not be used for new security-sensitive applications. It is included in this tool for compatibility and educational purposes, but SHA-256 or SHA-512 should be preferred for new projects.
MD5 is an older hash function producing a 128-bit (16-byte) hash. It has significant collision vulnerabilities and should never be used for security purposes. MD5 is included here for legacy system support and non-security applications like checksums. For any security-related work, use SHA-256 or higher.
Deterministic: The same input always produces the same hash. Quick Computation: Hash functions must compute the hash efficiently. Avalanche Effect: Even a tiny change in input produces a completely different hash. Preimage Resistance: It should be computationally infeasible to find an input that produces a given hash. Collision Resistance: It should be extremely difficult to find two different inputs that produce the same hash.
Our tool provides instant hashing in your browser with support for multiple algorithms. All processing happens locally—no data is sent to servers, ensuring your data privacy. Whether you're a developer, security professional, or student learning about cryptography, this free tool makes it easy to generate and understand hash values.
Hash functions alone are not sufficient for password storage. You must also use a salt (random value) and a key derivation function (KDF) like bcrypt, scrypt, or Argon2. These add computational difficulty that makes brute-force attacks infeasible. Simple MD5 or even SHA-256 of a password is vulnerable to rainbow table attacks. Always use a dedicated password hashing algorithm, not a generic hash function.
SHA-1 is no longer recommended because collision attacks have been demonstrated against it. In 2017, researchers successfully created two different inputs that produced the same SHA-1 hash. This breaks the fundamental property of collision resistance required for cryptographic security. Google and other major organizations have deprecated SHA-1 in favor of SHA-256 or SHA-512.
No, cryptographic hash functions are designed to be one-way functions. It should be computationally infeasible to find the original input from a hash value. This is different from encryption, which can be reversed with the correct key. The only way to "reverse" a hash is through brute force—trying many inputs until you find one that matches the target hash.
Yes, your data is completely private. All hashing is performed entirely in your browser using JavaScript's Web Crypto API. We do not send any data to our servers, log your inputs, or store any information. You can use this tool offline by downloading the HTML file.