Are my files or passwords uploaded to a server?

No! Whether you are hashing a simple password or verifying the checksum of a 2GB file, the entire cryptographic process happens 100% locally inside your web browser using the native Web Crypto API.

What is the difference between a Hash and an HMAC?

A Hash is a one-way mathematical algorithm that turns data into a fixed-length string (useful for verifying file integrity). An HMAC (Hash-based Message Authentication Code) is a hash that requires a Secret Key, making it impossible to forge without knowing the secret (useful for API security and webhooks).

Why is SHA-256 better than MD5?

MD5 is an outdated algorithm that is vulnerable to 'collision attacks', where two different files can produce the same hash. SHA-256 provides a much larger cryptographic space, making collisions practically impossible.

Hash & HMAC Generator | MD5, SHA-256, SHA-512

Understanding Cryptography Tools

Native Web Crypto API

Our tool leverages the modern window.crypto.subtle interface built into your browser. This allows us to process extremely large files and complex hashes blazingly fast without relying on third-party servers or heavy external scripts.

Verifying File Integrity

When you download a software installer or ISO file, the developer often provides a SHA-256 hash on their website. You can drag and drop your downloaded file into our tool to instantly verify that the hashes match, ensuring the file wasn't corrupted or tampered with by hackers.

Frequently Asked Questions

Which algorithm should I choose?

If you are hashing a password or verifying a modern download, use SHA-256 or SHA-512. If you are verifying older legacy files, MD5 or SHA-1 might be required, but they should no longer be used for new security implementations.

How does the HMAC Generator work?

HMAC (Hash-based Message Authentication Code) is heavily used in API security (like Stripe or GitHub webhooks). It combines your payload data with a Secret Key. The receiving server performs the same calculation; if the resulting hashes match, it proves the data is authentic and the sender knows the secret key.

Hash & HMAC Generator