A hash is a fixed-length string generated from input data. The same input always produces the same hash, but even a tiny change produces a completely different hash.

MD5 is not considered cryptographically secure for security purposes (it has known collision vulnerabilities). Use SHA-256 or SHA-512 for security-sensitive applications.

Yes. Switch to File mode and select any file. The hash is computed locally — your file is never uploaded.

Hash Generator

Generate cryptographic hashes for text or files. All hashing happens locally in your browser — nothing is uploaded.

Files never leave your browser

HMAC mode (SHA-256)

How to use Hash Generator

The Hash Tool computes cryptographic hash digests from text or file input using algorithms including MD5, SHA-1, SHA-256, SHA-384 and SHA-512. Hash functions produce a fixed-length fingerprint of any input — a tiny change in the input produces a completely different digest. They are used to verify file integrity, store passwords securely and create digital signatures in security protocols.

Choose input type: paste text directly, or upload a file for binary hashing.
Select one or more hash algorithms from the list (MD5, SHA-1, SHA-256, SHA-512, etc.).
For text input, choose the character encoding (UTF-8 recommended).
Click Compute to generate the digest(s).
Compare the output against a known checksum to verify file integrity, or copy the hash for use in your application.

Your data never leaves your device — 100% private processing.

Cryptographic properties of hash functions

A secure cryptographic hash function must satisfy three properties: pre-image resistance (given a hash, it is computationally infeasible to find the original input), second pre-image resistance (given an input, it is infeasible to find a different input producing the same hash), and collision resistance (it is infeasible to find any two distinct inputs with the same hash). MD5 and SHA-1 are broken for security use — collisions have been demonstrated — but remain acceptable for non-security integrity checks such as file deduplication.

Choosing the right algorithm

SHA-256 (part of the SHA-2 family) is the current standard for most security applications including TLS certificates, code signing and Bitcoin. SHA-512 offers a larger digest and slightly better performance on 64-bit processors. SHA-3 (Keccak) uses a different internal construction and is recommended when resistance to length-extension attacks is required without an HMAC wrapper. For password storage, use a purpose-built key derivation function (bcrypt, scrypt or Argon2) rather than a raw hash algorithm.

Hash algorithm comparison
Algorithm	Digest size	Speed	Security status
MD5	128 bits (16 bytes)	Very fast	Broken — collisions known
SHA-1	160 bits (20 bytes)	Fast	Deprecated — collisions known
SHA-256	256 bits (32 bytes)	Moderate	Secure — current standard
SHA-384	384 bits (48 bytes)	Moderate	Secure
SHA-512	512 bits (64 bytes)	Fast on 64-bit	Secure
SHA-3 (256)	256 bits (32 bytes)	Moderate	Secure — different construction

Glossary

Hash function: A deterministic algorithm that maps arbitrary input to a fixed-size output (digest).
Digest: The fixed-length hexadecimal string output of a hash function.
Collision: Two different inputs that produce identical hash output — a security flaw in weak algorithms.
HMAC: Hash-based Message Authentication Code — a hash computed with a secret key to authenticate messages.
Checksum: A hash value used to verify that data has not been corrupted or tampered with during transfer.

Frequently Asked Questions

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Why use Hash Generator?

No installation — use directly from any browser
Handles large inputs without crashing or timeouts
Syntax highlighting and formatted output for readability
Copy to clipboard shortcut for fast workflow integration

Common use cases

Validate and format JSON responses from APIs
Encode/decode Base64 strings during debugging
Generate UUIDs for database seeds or test data
Minify CSS or JavaScript before deployment
Diff two code snippets to spot regressions

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