Hash functions are fundamental to modern computing — from verifying file integrity and storing passwords to blockchain and digital signatures. Our free Hash Generator computes MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly in your browser. It also includes a hash verifier so you can confirm that a file or message has not been tampered with.
What Is a Hash Function?
A cryptographic hash function takes any input — a word, a sentence, an entire file — and produces a fixed-length output called a hash (or digest). Hash functions have three critical properties: they are one-way (you cannot reverse a hash to get the original input), deterministic (the same input always produces the same hash), and collision-resistant (it is computationally infeasible to find two different inputs that produce the same hash).
MD5 vs SHA-1 vs SHA-256 — Which to Use?
- MD5 (128-bit) — Cryptographically broken. Use only for non-security checksums like detecting accidental file corruption. Do not use for passwords or security.
- SHA-1 (160-bit) — Deprecated for security use. Still found in legacy Git commits and older certificates. Avoid for new implementations.
- SHA-256 (256-bit) — The current standard. Used in Bitcoin, SSL/TLS certificates, JWT tokens, and most modern security applications. This is the right default choice.
- SHA-512 (512-bit) — Maximum strength SHA-2. Used where maximum collision resistance is required. Slower but more secure.
How to Verify a File Hash
When you download software or a large file, the provider often publishes the expected SHA-256 hash alongside it. After downloading, you hash the file and compare. If the hashes match, the file is intact and unmodified. If they differ, the file was corrupted during download or tampered with. Our tool includes a hash comparison section — paste the original text and the expected hash, and it instantly tells you whether they match.
100% Client-Side — Your Data Never Leaves the Browser
Our hash generator uses the browser built-in Web Crypto API for SHA hashes and a pure JavaScript implementation for MD5. Your input text is never sent to any server. Everything is computed locally in your browser. This makes it safe to use even for sensitive text — though you should never paste passwords or private keys into any online tool as a general practice.
Generate Your Hash Now
Open the free Hash Generator, paste your text, and get MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes simultaneously. Use the verify tab to check hash integrity. No login, completely free.
