SHA Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text instantly in your browser.

Last updated: March 25, 2026

Used 34K+ times

Input Text

Algorithm

SHA-256 Hash

Enter text to generate hash...

Client-Side Processing

Input Data Stays on Device

Instant Local Execution

What users say

“Having all four SHA variants on one page is very convenient. The comparison between SHA-1 and SHA-256 security in the FAQ is accurate and well-explained.”

Alex F. — Security Researcher

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What is SHA Hash Generator?

The Secure Hash Algorithm (SHA) family are cryptographic hash functions standardized by NIST. They transform any input text into a fixed-length "digest" that acts as a digital fingerprint. Unlike MD5, SHA-256 and SHA-512 have no known practical collision vulnerabilities, making them the gold standard for security-critical hashing in 2024 — from TLS certificates and JWT tokens to blockchain and code signing.

This tool supports all four major SHA variants: SHA-1 (160-bit, legacy), SHA-256 (256-bit, the everyday standard), SHA-384 (384-bit, federal/compliance use), and SHA-512 (512-bit, maximum security). All computation runs directly in your browser using the Web Crypto API — your input is never transmitted to any server.

How to Use SHA Hash Generator

Type or paste your input text into the text area

Select the SHA algorithm version from the dropdown (SHA-256 is recommended for most uses)

The hash is generated instantly and displayed in the output field

Click "Copy" to copy the hash to your clipboard

Toggle between uppercase and lowercase hex output if needed

Common Use Cases

Verifying software download integrity (comparing against published SHA-256 checksums)
Signing JWT tokens using HMAC-SHA256
Hashing passwords with SHA-256 before storing (with salting)
Generating deterministic IDs from content (content-addressed storage)
Meeting compliance requirements (FIPS 140-2, SOC 2) that mandate SHA-256+
Creating digital signatures for documents and API requests
Checking message integrity in webhook payloads
Validating SSL/TLS certificate fingerprints

Example Input and Output

SHA-256 always produces a 64-character hex string regardless of input length. Notice the "avalanche effect" — changing one character completely transforms the hash.

Input text

The quick brown fox jumps over the lazy dog

SHA-256 hash (64 hex characters)

d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592

Web Crypto API

This tool uses window.crypto.subtle, the browser's native cryptographic API (available in all modern browsers). It is faster and more secure than JavaScript-based hash implementations.

Privacy Guarantee

Your input is processed entirely in your browser. It is never sent to our servers, never logged, and is cleared from memory when you close the tab.

Use SHA-256, Not MD5

If you or your codebase currently uses MD5 for checksums or data integrity, migrate to SHA-256. The output is larger (64 vs 32 chars) but SHA-256 has zero known practical vulnerabilities and is the industry standard.

Frequently Asked Questions

Which SHA version should I use?

SHA-256 is the right choice for almost all purposes — it is the current NIST standard, fast, and widely supported. Use SHA-512 if you need extra security margin or are on a 64-bit server where SHA-512 is actually faster. Avoid SHA-1 for new projects — it is cryptographically broken.

What is the difference between SHA-256 and SHA-512?

SHA-256 produces a 256-bit (64 hex char) digest using 32-bit word operations. SHA-512 produces a 512-bit (128 hex char) digest using 64-bit word operations. SHA-512 is stronger and can be faster on 64-bit hardware. For most use cases, SHA-256 is sufficient.

Is SHA-256 safe for password storage?

Not alone. Raw SHA-256 without salting is vulnerable to rainbow table attacks, and its speed makes GPU brute-forcing practical. Use a dedicated password hashing function — bcrypt, Argon2id, or PBKDF2-SHA256 — which are designed to be slow and include built-in salting.

Why does SHA-1 still appear as an option?

SHA-1 is included for legacy compatibility — some older systems, Git (internally), and pre-2016 certificates still use it. Do not use SHA-1 for any new security implementation. It has known collision vulnerabilities exploited in practice (SHAttered attack, 2017).

Can I reverse a SHA hash to get the original text?

No. SHA functions are one-way — mathematically, no efficient algorithm exists to reverse them. This is a core design property called "preimage resistance." An attacker can only guess inputs and compare hashes, which is why long, random inputs are critical for security.

Is my text sent to a server when I use this tool?

No. This tool uses the browser-native Web Crypto API (window.crypto.subtle.digest). Your input is processed entirely on your device and never transmitted anywhere. This is why the tool works offline.

What is HMAC-SHA256 and how is it different?

HMAC (Hash-based Message Authentication Code) combines SHA-256 with a secret key, producing a hash that proves both message integrity and knowledge of the key. Plain SHA-256 only proves content identity — anyone with the same input gets the same hash. HMAC adds authentication, making it ideal for API signatures and JWT tokens.

How This Tool Works

This tool calls the browser's built-in Web Crypto API (SubtleCrypto.digest()) with the selected algorithm identifier. The browser's crypto engine — implemented in native C++ — processes the input using the corresponding NIST-specified compression function (e.g. 64 rounds of bitwise operations for SHA-256). The raw output bytes are then converted to a lowercase hexadecimal string for display. Because the Web Crypto API is used, hashing is faster and more trustworthy than any JavaScript implementation.

Technical Stack

Web Crypto API (SubtleCrypto)SHA-1 / SHA-256 / SHA-384 / SHA-512Client-side onlyNo external dependencies