Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input. All hashing runs locally in your browser.
How to Use This Tool
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Type or paste the text you want to hash into the input field.
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Select the hash algorithm: MD5, SHA-1, SHA-256, or SHA-512.
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The hash digest is computed instantly and displayed in hexadecimal format.
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Click Copy to copy the hash to your clipboard for use in checksums, comparisons, or lookups.
What is Hash?
A cryptographic hash function takes an input of arbitrary size and produces a fixed-length output — the hash or digest — that acts as a unique fingerprint for that input. Even a tiny change in the input (a single character) produces a completely different hash, and it is computationally infeasible to reconstruct the original input from the hash alone. These properties — determinism, avalanche effect, and one-way irreversibility — make hashing fundamental to computer security.
MD5 and SHA-1 are older algorithms that produce 128-bit and 160-bit digests respectively. Both are now considered cryptographically broken for security purposes — researchers have demonstrated collision attacks where two different inputs produce the same hash. However, they remain widely used for non-security purposes such as file integrity checks, cache keys, and legacy system identifiers. SHA-256 and SHA-512 are members of the SHA-2 family, currently considered secure and recommended for new applications. SHA-256 is the standard for Bitcoin, TLS certificates, and code signing; SHA-512 offers a larger output and is preferred on 64-bit systems.
Common use cases for hashing include verifying file integrity (comparing the hash of a downloaded file to the published checksum), storing passwords (combined with a salt using algorithms like bcrypt or Argon2, which incorporate SHA internals), generating deterministic IDs from content, and creating message authentication codes (HMACs) to verify data authenticity in API calls.
Frequently Asked Questions
helpCan I reverse a hash back to the original text?
No. Cryptographic hash functions are designed to be one-way — it is computationally infeasible to recover the original input from the hash. What you can do is look up common values in a rainbow table (a pre-computed database of hashes), which is why passwords should always be hashed with a salt using a slow algorithm like bcrypt or Argon2, not a raw SHA hash.
helpIs MD5 safe to use?
MD5 is not safe for security-sensitive use cases such as digital signatures or password hashing — collision attacks have been demonstrated in practice. It is still acceptable for non-security purposes like detecting accidental file corruption or generating cache keys where an adversary is not trying to produce a collision.
helpWhat is the difference between SHA-256 and SHA-512?
Both are members of the SHA-2 family and are currently considered secure. SHA-256 produces a 256-bit (32-byte) digest and is the most widely deployed. SHA-512 produces a 512-bit (64-byte) digest, offers a marginally higher security margin, and is faster than SHA-256 on 64-bit hardware because it uses 64-bit word operations internally.
helpIs my data sent to a server?
No. All hashing is performed locally in your browser using the Web Crypto API. Your input text never leaves your device.