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Hash Generator (SHA) — SHA-256, SHA-384, SHA-512 & More

Create digital fingerprints for text and files — choose the right SHA algorithm for integrity checks, checksums, and deduplication.

SHA-256
Result

What is Hash Generator?

A cryptographic hash function converts any input into a fixed-length string of characters — a digital fingerprint. This tool lets you generate hashes using SHA-1, SHA-256, SHA-384, or SHA-512.

Deterministic — the same input always produces the same output.
One-way — you cannot reverse a hash to recover the original input.
Fixed output length — regardless of input size, the output is always the same length for a given algorithm.
Avalanche effect — a tiny change in input produces a dramatically different output hash.

Zero-Server Tool Data Guarantee

All hashing happens locally in your browser using the Web Crypto API. Your input is never sent to any server.

How to Use

01

Enter Your Text or File

Type or paste the text you wish to hash, or drop a file onto the input area.

02

Select Algorithm

Choose from SHA-1, SHA-256, SHA-384, or SHA-512 depending on your security needs.

03

Verify a Checksum

Switch to the Verify tab and paste a published checksum to confirm it matches the hash of your input.

04

Copy Secure Hash

The hash is calculated instantly. Use the copy button to save the resulting hex string.

Common Use Cases

File Integrity Verification

Generate a hash of a file before and after transfer to confirm it wasn't corrupted or tampered with.

Password Hashing

Hash passwords before storage. For production systems, always add a salt and use a slow KDF like bcrypt.

Data Deduplication

Hash content to find duplicate records or files without comparing them byte-by-byte.

Checksum Verification

Verify software downloads against publisher-provided checksums to ensure authenticity.

Which SHA hash should I use?

This generator covers SHA-1, SHA-256, SHA-384, and SHA-512. For a specific algorithm, its dedicated tool has more context and examples:

SHA-256Default choice for file integrity, checksums, and downloads.SHA-512High-assurance integrity — faster on 64-bit CPUs.SHA3-256Modern SHA-3 / Keccak — the NIST FIPS 202 sponge hash.MD5Legacy checksums and deduplication only — broken for security.HMACAuthenticated hashing with a secret key for APIs and webhooks.All hashing toolsIncluding password KDFs — Argon2, bcrypt, scrypt, PBKDF2.

Implementation Examples

JavaScriptBrowser (Web Crypto API)
async function hashMessage(message, algorithm = 'SHA-256') {
    const msgBuffer = new TextEncoder().encode(message);
    const hashBuffer = await crypto.subtle.digest(algorithm, msgBuffer);
    return Array.from(new Uint8Array(hashBuffer))
        .map(b => b.toString(16).padStart(2, '0')).join('');
}


// SHA-256
await hashMessage('hello', 'SHA-256');
// SHA-512
await hashMessage('hello', 'SHA-512');

SHA-1 vs SHA-256 vs SHA-384 vs SHA-512

AlgorithmOutput SizeSecurity LevelRecommended?
SHA-1160-bit (40 hex)Broken (collisions found)No (legacy only)
SHA-256256-bit (64 hex)128-bitYes (default choice)
SHA-384384-bit (96 hex)192-bitYes (high security)
SHA-512512-bit (128 hex)256-bitYes (maximum security)

Production Best Practices & Security

Use SHA-256 as your default — it offers an excellent balance of security, performance, and compatibility. Why:SHA-256 is the current industry standard for data integrity and is supported by virtually all platforms and libraries.
Avoid SHA-1 for security — it has known collision vulnerabilities and should only be used for legacy compatibility. Why:Attackers can generate two different inputs that produce the same SHA-1 hash, making it unreliable for verifying the authenticity of data.
SHA-512 for maximum security — when you need the highest collision resistance, SHA-512 is the strongest option. Why:With a 512-bit output, it provides a much larger security margin against potential future attacks than shorter hashes.
Don't hash passwords directly — use bcrypt, scrypt, or PBKDF2 with a salt for password storage. Why:Fast hashes like SHA-256 can be brute-forced billions of times per second on modern hardware. Slow KDFs are designed to resist these attacks.
Use HMAC for authenticated hashing — a plain hash only provides integrity; HMAC adds authenticity with a secret key. Why:HMAC ensures that the hash was created by someone who knows the secret key, preventing attackers from simply generating a new hash for modified data.
Store hashes securely — even though hashes are one-way, protect them from database leaks by salting and using slow KDFs. Why:Salting ensures that identical inputs result in different hashes, protecting against precomputed table attacks.

Frequently Asked Questions

A cryptographic hash is a one-way function. It takes any input — a word, a file, a terabyte of video — and produces a fixed-length alphanumeric string called a digest.

It has four essential properties:

  • Deterministic — same input always produces the same output
  • Fast to compute
  • Preimage-resistant — you cannot reverse the hash to recover the input
  • Collision-resistant — two different inputs should never produce the same hash

Cryptographic hashes are the foundation of data integrity verification, password storage, digital signatures, and blockchain technology.