Crypto Hash Generator — SHA-256, MD5, SHA-1, SHA-512, Keccak-256
Generate cryptographic hashes locally in your browser using SHA-256, MD5, SHA-1, SHA-384, SHA-512, and Keccak-256 (SHA-3). Zero-knowledge — no data is sent to any server.
Crypto Hash
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The Formula
A cryptographic hash function maps input data of arbitrary size to a fixed-size output (the hash/digest). Hashing is a one-way operation: you cannot reverse a hash to recover the original input. Small changes in input produce dramatically different hashes (avalanche effect).
Variable Definitions
Secure Hash Algorithm 256-bit
NIST-standard 256-bit hash. Used in Bitcoin, TLS, and file integrity verification. Outputs 32 bytes (64 hex chars).
Message Digest 5
128-bit hash. Fast but cryptographically broken — vulnerable to collision attacks. Do not use for security. Still used for checksums.
Secure Hash Algorithm 1
160-bit hash. Deprecated after SHAttered collision attack in 2017. Being phased out of TLS certificates.
Secure Hash Algorithm 512-bit
256-bit security level. Outputs 64 bytes (128 hex chars). Used in high-security applications.
Keccak (SHA-3) 256-bit
SHA-3 winner. Uses sponge construction instead of Merkle-Damgard. Different internals than SHA-2.
How to Use This Calculator
- 1
Type or paste text into the input field.
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Select a hash algorithm from the dropdown.
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The hash is computed instantly in your browser — no data is sent to any server.
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Compare hashes across algorithms to see different output sizes.
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Try changing one character in the input to see the avalanche effect.
Common Applications
- Verifying file integrity by computing and comparing SHA-256 checksums after downloading software, firmware, or data archives
- Understanding how cryptographic hashing works for password storage, digital signatures, and blockchain applications
- Comparing hash algorithms such as SHA-256, MD5, and SHA-512 to understand output sizes and security properties for different use cases
- Demonstrating the avalanche effect by observing how small input changes produce completely different hash outputs
Cryptographic hash — one-way function from arbitrary input to fixed-size digest
Understanding the Concept
Cryptographic hashing is a fundamental building block of modern security. Unlike encryption, hashing is one-way: you cannot "decrypt" a hash. This makes hashes ideal for password storage (systems store hashes, not passwords), file integrity verification (compare checksums), digital signatures, and blockchain technology. The avalanche effect means changing even one bit of input flips approximately 50% of output bits. SHA-256 is currently the most widely deployed secure hash; MD5 and SHA-1 should not be used for security purposes as they are vulnerable to collision attacks where two different inputs produce the same hash.
Frequently Asked Questions
Sources & References
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