SHA-256 Hash Generator

SHA-256, SHA-384 and SHA-512 digests computed locally with the Web Crypto API. Nothing is uploaded.

Verify a Download in 30 Seconds

The most common real-world use for this tool: checking that a file you downloaded is the file the publisher shipped. Software sites publish the expected SHA-256 next to the download; you compute yours and compare.

  1. macOS / Linux: shasum -a 256 file.dmg or sha256sum file.iso
  2. Windows PowerShell: Get-FileHash file.exe -Algorithm SHA256
  3. Compare the output to the published hash - Every character must match. One different character means a different file: corrupted, or tampered with.

Small print that matters: a matching hash proves integrity, not authorship - if an attacker controls the download page, they control the published hash too. That's what code signing and HTTPS add on top.

About the SHA-2 Family

Where SHA-256 is used

SHA-256 is the workhorse of modern cryptography. It secures:

  • TLS certificates - The padlock in your browser
  • Code signing and software updates
  • Bitcoin mining and blockchain integrity
  • File checksums - Verifying downloads aren't tampered with

Unlike MD5, no practical collisions are known, and the 256-bit output gives a comfortable margin for decades.

One thing SHA-256 is not good for by itself: storing user passwords. It's too fast - Attackers test billions of guesses per second. Password storage needs deliberately slow hashes like bcrypt or Argon2, as explained in our hashing guide.

Hashing vs encryption

A hash is one-way: you can't get the input back from the digest. Encryption is two-way: with the key, you recover the original. Use hashes to verify, encryption to protect - Our AES-256 tool handles the latter.

Related tools: Base64 encoder/decoder (encoding, not security!), UUID generator for random identifiers, and the password generator for the secrets you hash-protect.

How to Use the SHA-256 Hash Generator

1

Paste your text

Hashing runs locally through the Web Crypto API as you type.

2

Pick a variant

SHA-256 for general use; SHA-384/512 where a longer digest is specified.

3

Copy the hex digest

64 hex characters for SHA-256 - Compare it against a published checksum to verify integrity.

The SHA-2 family

VariantOutput bitsHex lengthTypical use
SHA-22422456 charsConstrained legacy protocols
SHA-25625664 charsTLS certificates, file checksums, Bitcoin, JWT signing
SHA-38438496 charsTLS suites, Suite B compliance
SHA-512512128 charsFaster on 64-bit CPUs; long-margin applications

SHA-256 Hash Generator - FAQ

Is SHA-256 secure in 2026?
Yes. No collisions have ever been found, and the 256-bit output leaves an enormous security margin. Even Grover's quantum algorithm would only halve its effective strength to 128 bits - Still unbreakable.
Why shouldn't I store passwords as plain SHA-256?
Speed. A GPU computes billions of SHA-256 hashes per second, so stolen password hashes can be brute-forced quickly. Password storage needs slow hashes (bcrypt, Argon2) that cap the guessing rate.
What's the difference between SHA-256 and SHA-3?
Different internal designs. SHA-3 (Keccak) was standardized in 2015 as insurance in case SHA-2 ever weakened. It hasn't - So SHA-256 remains the everyday standard, with SHA-3 as a hedge.

More questions about passwords and security? Browse the security guides.

More Free Tools

Password Generator →

AES-256 Encryption

Encrypt and decrypt text with AES-256, right in your browser.

MD5 Hash Generator

Compute MD5 checksums of any text instantly.

Base64 Encoder / Decoder

Encode and decode Base64 text and URLs.

UUID Generator

Random version-4 UUIDs, one or in bulk.

Case Converter

UPPER, lower, Title, camelCase and more.

Bcrypt Hash Generator

Hash and verify passwords with bcrypt - The slow hash built for passwords.