Is my input sent to a server?

No. The entire computation happens in your browser using the Web Crypto API. Nothing is transmitted to any server.

SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a fixed-length 64-character hex digest from any input. It is widely used for data integrity verification and digital signatures.

Why does a small change in input produce a completely different hash?

This is the avalanche effect — a fundamental property of cryptographic hash functions. Even a single-character change cascades into a completely different 256-bit output.

Can I reverse a SHA-256 hash back to the original text?

No. SHA-256 is a one-way function. Given a hash, it is computationally infeasible to recover the original input with current technology.

Does letter case in the input matter?

Yes. "Hello" and "hello" are different byte sequences and produce different SHA-256 hashes. The tool is case-sensitive.

SHA256 Hash Generator

Name: SHA256 Hash Generator
Availability: InStock
Author: Nham Vu

Type or paste any text and instantly get its SHA-256 hash computed entirely in your browser.

Input Text

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SHA-256 Hash

Enter text on the left to see the hash

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Summary

Type or paste any text and instantly get its SHA-256 hash computed entirely in your browser.

How it works

Type or paste the text you want to hash into the input area.
The tool encodes your text as UTF-8 bytes.
The Web Crypto API's SubtleCrypto.digest() method computes the SHA-256 hash.
The resulting 32-byte ArrayBuffer is converted to a 64-character lowercase hex string.
The hash updates automatically as you type — no button press needed.
Click the copy button to copy the hash to your clipboard.

Use cases

Verify file or message integrity by comparing SHA-256 checksums.
Hash passwords or tokens during local development and testing.
Generate deterministic identifiers from text strings.
Cross-check hashes published by software download pages.
Experiment with cryptographic concepts without installing tools.
Quickly hash API keys or secrets when building authentication flows.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu