What is a cryptographic hash?

A cryptographic hash function is a one-way function that produces a fixed-size digest from any input. The same input always produces the same output, but it is computationally infeasible to reverse the process or find a different input with the same hash.

Which algorithm should I use for passwords?

Use Bcrypt for storing passwords. Unlike MD5 and SHA, Bcrypt is designed to be slow and includes a salt, which makes it resistant to rainbow table attacks and brute force.

MD5 is not considered cryptographically secure for new applications. It is vulnerable to collision attacks and should not be used for digital signatures or password storage. It is still useful for non-security checksums.

What is the Bcrypt cost factor?

The cost factor (also called work factor or rounds) is an exponent. The computation time doubles with each increment. A cost of 10 means 2^10 = 1024 rounds. Higher values are more secure but slower.

Why is Bcrypt slow to generate?

Bcrypt is intentionally slow. This is a security feature: it forces attackers to spend significant time on each guess when attempting to crack hashed passwords.

Are my hashes stored anywhere?

No. All hashing is performed locally in your browser. Zolkit has no server-side processing for this tool.

Can I hash large files with this tool?

This tool is designed for text input. For hashing large files, you would typically use a command-line tool like sha256sum or openssl dgst.

Hash Generator

Generate cryptographic hashes from any text. Supports MD5, SHA-1, SHA-256, SHA-512, and Bcrypt. Everything runs in your browser.

Input Text

Generate Cryptographic Hashes in Your Browser

A cryptographic hash function takes an input and produces a fixed-size output (digest) that is unique to that input. Zolkit's Hash Generator supports MD5, SHA-1, SHA-256, SHA-512, and Bcrypt — all running locally in your browser using the Web Crypto API and a pure-JavaScript Bcrypt implementation.

100% Private

All hashing happens locally in your browser. Your data never leaves your device.

5 Algorithms

Supports MD5, SHA-1, SHA-256, SHA-512, and Bcrypt in one unified interface.

Bcrypt Cost Factor

Adjust the Bcrypt cost factor (4–12) to control the work factor. Default is 10.

Web Crypto API

SHA algorithms use the browser's native Web Crypto API for maximum performance and security.

No Server Needed

All hashing runs directly in your browser — no backend, no API calls, no latency. Works offline after the first load.