JS Tools

Online SHA-256 Hash Generator

Compute SHA-256 digest of text.

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How to use

  1. Paste or type your input in the left editor
  2. Adjust options in the toolbar if available
  3. Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About SHA-256 Hash

Compute SHA-256 digest of text.

The SHA-256 hash generator processes your input through the SHA-256 algorithm, which pads the message to a multiple of 512 bits, then divides it into blocks. Each block is processed through 64 rounds of bitwise operations, modular additions, and compression functions using eight 32-bit working variables. The final state of these variables is concatenated to produce the 256-bit (64 hexadecimal character) hash digest. All computation runs locally in your browser using the Web Crypto API.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Why this tool?

FeatureSHA-256 HashTypical alternatives
Free online toolYesOften yes
Client‑side only (privacy)YesVaries
No sign‑up requiredYesVaries

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FAQs

What is a SHA-256 hash and what is it used for?
SHA-256 produces a fixed 256-bit (64 hexadecimal character) hash value from any input data. It is used for data integrity verification, password hashing, digital signatures, blockchain proof-of-work, and file checksum generation.
Can a SHA-256 hash be reversed to get the original data?
No. SHA-256 is a one-way cryptographic hash function — it is computationally infeasible to reverse the hash back to the original input. This property is what makes it suitable for password storage and data integrity verification.
Does the SHA-256 output change if the input differs by one character?
Yes. Even a single character change — such as changing a lowercase letter to uppercase — produces a completely different 64-character hash. This is called the avalanche effect and is a key property of cryptographic hash functions.
Can two different inputs produce the same SHA-256 hash?
Theoretically yes (this is called a collision), but no SHA-256 collision has ever been found. The probability of a random collision is approximately 1 in 2^256, making SHA-256 collision-resistant for all practical purposes.
What is the difference between SHA-256, SHA-1, and MD5?
MD5 (128-bit) and SHA-1 (160-bit) are older hash functions with known collision vulnerabilities and should not be used for security. SHA-256 (256-bit) is part of the SHA-2 family and remains secure for all cryptographic applications.
Can I generate a SHA-256 hash of a file?
Yes. Upload or paste the file content and the generator will compute its SHA-256 hash. This is commonly used to verify file integrity — compare the hash against a published checksum to confirm the file has not been tampered with.