Online Hash Generator — MD5, SHA-256 & SHA-512
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly with full Unicode support. No sign-up, 100% in browser.
Enter text to compute hash…
Enter text to compute hash…
Enter text to compute hash…
Enter text to compute hash…
Built by
Miguel Ángel Colorado Marin
Built by
Miguel Ángel Colorado Marin
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to use the hash generator?
- 1
Type or paste your text
Enter any text in the input area. All four hashes (MD5, SHA-1, SHA-256 and SHA-512) are calculated automatically in real time. MD5 uses a pure JavaScript implementation, while SHA-1, SHA-256 and SHA-512 use the browser's native Web Crypto API for maximum speed and security.
- 2
Read the results
Each row shows the algorithm name, the number of bits in the resulting hash and the length in hexadecimal characters. A SHA-256 hash always has 64 hex characters; SHA-512 has 128. This fixed length is a fundamental property of cryptographic hash functions.
- 3
Switch between uppercase and lowercase
By default hashes are shown in lowercase (most common format). Toggle Uppercase to get them in uppercase, useful in some contexts such as case-sensitive comparisons or legacy formats.
- 4
Copy the hash you need
Each algorithm has its own Copy button with visual feedback (green checkmark for 2 seconds). You can copy MD5, SHA-1, SHA-256 and SHA-512 independently without manually selecting the text.
Frequently asked questions
What is a cryptographic hash function?
A cryptographic hash function converts any input into a fixed-length string (the hash or digest) in a deterministic way: the same input always produces the same hash. They are one-way functions: it is computationally infeasible to obtain the original input from the hash. They are used to verify file integrity, store passwords and in digital signatures.
Is MD5 safe for passwords?
No. MD5 (and also SHA-1) are deprecated algorithms for cryptographic use. They are vulnerable to collision attacks and there are massive rainbow table databases that can reverse common MD5 hashes. For passwords, use algorithms specifically designed for the purpose: bcrypt, scrypt or Argon2. MD5 remains useful for verifying file integrity in non-critical contexts.
What is the difference between SHA-256 and SHA-512?
Both are part of the SHA-2 family and are safe for cryptographic use. SHA-256 produces a 256-bit hash (64 hex chars) and SHA-512 produces 512 bits (128 hex chars). SHA-512 is theoretically more secure, but SHA-256 is more efficient on 32-bit CPUs. On 64-bit CPUs, SHA-512 can be equally fast or faster.
What is integrity verification with a hash used for?
When you download software, the developer publishes the SHA-256 hash of the file. After downloading, you calculate the hash of the downloaded file and compare it with the published one. If they match, the file is genuine and was not modified during transmission. If they don't match, the file may be corrupted or tampered with.
Is my data sent to any server?
No. MD5 is calculated with a pure JavaScript implementation running in your browser. SHA-1, SHA-256 and SHA-512 use the Web Crypto API, which is a browser API that never sends data to external servers. All processing happens locally on your device.
Embed the generator on your site
Embed this hash generator in any web page with a simple iframe:
<iframe
src="https://miguelacm.es/embed/hash-generator"
width="100%"
height="600"
frameborder="0"
title="Hash Generator"
></iframe>