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SHA-256 Hash Generator

100% Free

Generate SHA-256 hashes and HMAC-SHA256 signatures — the secure standard for file integrity, JWT signing, and API request signatures.

Real-time
Client-Side
FIPS 180-4
Mode:
Output case:
SHA-256 Hash 256 bits · 64 hex chars
Type something above…

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<iframe
  src="https://tools.town/embed/sha256-generator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="SHA-256 Hash Generator">
</iframe>

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How to Use

  1. 1 Pick mode — SHA-256 (plain hash) or HMAC-SHA256 (with secret key)
  2. 2 For HMAC: enter your shared secret
  3. 3 Type or paste any text into the message box
  4. 4 Watch the 64-character hex hash update in real time
  5. 5 Copy to clipboard with one click

Features

  • Plain SHA-256 hashing for file integrity
  • HMAC-SHA256 mode for API request signing (AWS Sig v4, Razorpay, Stripe style)
  • Real-time hashing as you type
  • Lowercase or UPPERCASE output
  • UTF-8 input encoding
  • Uses Web Crypto API — same primitives as the underlying browser

Why it Matters

SHA-256 is the workhorse cryptographic hash — used in Bitcoin, JWT signatures, TLS certificates, GitHub release checksums, and almost every API request signing scheme. Having a fast, browser-native generator makes debugging signature mismatches trivial.

★★★★★

Use Cases

File Integrity

Verify a download matches the publisher's SHA-256

API Request Signing

Test HMAC signatures for webhooks before deploying

Bitcoin / Blockchain

Hash transaction data and merkle tree roots

Frequently Asked Questions

Is SHA-256 still secure?
Yes — no practical collision attacks against SHA-256 exist. It's part of FIPS 180-4 and approved by NIST through 2030+.
What's the difference between SHA-256 and HMAC-SHA256?
SHA-256 is a plain hash (anyone can compute it). HMAC-SHA256 mixes in a secret key, so only parties holding the key can verify the signature — that's why APIs use it to authenticate requests.
Why does my HMAC signature differ from another tool's?
Common causes: (a) the input/key is encoded differently (UTF-8 vs ASCII), (b) the message string itself differs (newline at end? trailing space?), (c) the output encoding differs (hex vs base64). This tool produces hex.
Can I use this for password storage?
No — plain SHA-256 is too fast for passwords (an attacker can brute-force billions per second). Use bcrypt, scrypt, or argon2 for password hashing.
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Want to learn how this works?

Browse all guides →
How to Use SHA-256 Hash Genera
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How to Use SHA-256 Hash Generator — Complete Guide

Learn how to generate SHA-256 hashes for file verification, HMAC signing, and data integrity using Tools.Town's free SHA-256 Generator.

8 May 2026

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Hash Algorithms Explained — MD5, SHA-1, SHA-256 & Beyond

A plain-language guide to cryptographic hash functions. Learn what hashing is, how it works, and which algorithm to pick for passwords, file verification, or blockchain.

8 Mar 2026

5 min read

SHA-256
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SHA-256 — The Hash Algorithm Powering the Modern Web

A deep dive into SHA-256: how it produces its 64-character digest, why it's the current security standard, and how it's used in Bitcoin, TLS, and file verification.

8 Mar 2026

5 min read

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