# Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes. Everything stays in your browser.

MD5 (128-bit, fast)

SHA-1 (160-bit)

SHA-256 (256-bit, secure)

SHA-384 (384-bit)

SHA-512 (512-bit, strongest)

About This Hash Generator

What It Does

A hash function takes any input — a password, a file, a sentence — and produces a fixed-size string of characters that looks random but is completely deterministic. The same input always produces the same hash, but even a tiny change (like capitalizing one letter) produces an entirely different hash — a property called the avalanche effect. This tool generates five common hash formats: MD5 (128-bit, fast but cryptographically broken), SHA-1 (160-bit, also deprecated for security), and the SHA-2 family — SHA-256 (256-bit), SHA-384 (384-bit), and SHA-512 (512-bit). SHA-256 and above are considered secure for modern applications. All hashing runs locally using your browser's Web Crypto API and a built-in MD5 implementation, so your data never leaves your machine.

Features

Common Use Cases

Developers verify file integrity by comparing a downloaded file's SHA-256 hash against the published checksum — if they match, the file wasn't corrupted or tampered with. Version control systems like Git use SHA-1 hashes to identify every commit and object. Password storage systems hash passwords with SHA-256 or bcrypt so that even if the database is breached, the original passwords aren't exposed. Digital signatures hash a document before signing it, making the signature compact and fast to verify. Blockchain systems use SHA-256 extensively — Bitcoin mining is literally searching for a SHA-256 hash below a target value.

Tips

For anything security-related, use SHA-256 or stronger. MD5 and SHA-1 are broken — researchers have demonstrated practical collision attacks where two different inputs produce the identical hash. If you're verifying file downloads, most reputable sites publish SHA-256 checksums. For password hashing specifically, use a dedicated password hashing function like bcrypt, scrypt, or Argon2 — SHA-256 is too fast, making brute-force attacks easier.

FAQ

Can a hash be reversed to get the original input?

No. Hashing is a one-way function — you cannot "decrypt" a hash to recover the original text. Given only a SHA-256 hash, the only way to find the input is to guess every possible input and hash it until you get a match (a brute-force attack). For long, complex inputs, this is computationally infeasible.

Why do small input changes produce completely different hashes?

This is called the avalanche effect — a deliberate design property of cryptographic hash functions. Even changing a single bit of input should flip roughly 50% of the output bits on average. This prevents attackers from inferring anything about the input by observing how the hash changes.

Is SHA-256 still secure in 2026?

Yes. There are no known practical attacks against SHA-256. While quantum computers could theoretically weaken it via Grover's algorithm (reducing effective security from 256 to 128 bits), this still requires a large-scale fault-tolerant quantum computer that doesn't exist yet. SHA-256 is the most widely trusted hash function in production today.

Should I use SHA-256 for storing passwords?

No — SHA-256 alone is too fast for password storage. A modern GPU can compute billions of SHA-256 hashes per second, making brute-force attacks practical. Use a purpose-built password hashing function like bcrypt, scrypt, or Argon2, which are deliberately slow and memory-hard. SHA-256 is great for file integrity, commit hashes, and digital signatures — just not for passwords.