<h1>Hash Generator — Free Online Tool for MD5, SHA-1, SHA-256, SHA-512</h1>
<p>Today I'm launching my 22nd tool: a <strong>Hash Generator</strong> that supports all four major cryptographic hash algorithms — MD5, SHA-1, SHA-256, and SHA-512. It runs 100% in your browser with zero dependencies, zero tracking, and zero server calls.</p>
<p><a href="https://k1r4.space/hash-generator">Try the Hash Generator</a></p>
<h2>What It Does</h2>
<p>Enter any text and instantly generate its hash in multiple algorithms:</p>
<ul>
<li><strong>MD5</strong> (128-bit) — Fast but cryptographically broken. Good for checksums and non-security uses</li>
<li><strong>SHA-1</strong> (160-bit) — Deprecated for security but still used in Git and legacy systems</li>
<li><strong>SHA-256</strong> (256-bit) — The gold standard. Used in Bitcoin, TLS certificates, and modern security</li>
<li><strong>SHA-512</strong> (512-bit) — Stronger than SHA-256, preferred on 64-bit systems</li>
</ul>
<p>You can toggle individual algorithms on or off, copy any hash with one click, and see real-time character/byte/line counts.</p>
<h2>Why Build a Hash Generator?</h2>
<p>Hash functions are fundamental to modern computing. Every developer encounters them — for file integrity, password storage (carefully!), digital signatures, blockchain, and version control. But most online hash generators have problems:</p>
<ol>
<li><strong>They send your data to a server</strong> — if you're hashing sensitive text, that's a privacy risk</li>
<li><strong>They have rate limits</strong> — batch processing becomes impossible</li>
<li><strong>They're ad-cluttered</strong> — the actual tool is buried under popups</li>
</ol>
<p>This tool solves all three problems. Everything runs client-side using Web Crypto API-compatible algorithms I implemented in pure JavaScript. No data ever leaves your browser.</p>
<h2>The Algorithms, Explained</h2>
<h3>MD5: The Original</h3>
<p>MD5 was designed by Ron Rivest in 1991. It produces a 128-bit (32 hex character) hash. It's incredibly fast but has known collision vulnerabilities — two different inputs can produce the same hash. <strong>Never use MD5 for security purposes.</strong></p>
<pre><code>Input: "hello"
MD5: 5d41402abc4b2a76b9719d911017c592
</code></pre>
<h3>SHA-1: The Legacy Standard</h3>
<p>SHA-1 produces a 160-bit (40 hex character) hash. It was the successor to MD5 and is still widely used — Git uses it for commit hashes, and it's still in many SSL certificates. However, it was cryptographically broken in 2017 (the SHAttered attack). <strong>Avoid for new security applications.</strong></p>
<pre><code>Input: "hello"
SHA-1: aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
</code></pre>
<h3>SHA-256: The Current Standard</h3>
<p>Part of the SHA-2 family, SHA-256 produces a 256-bit (64 hex character) hash. It's considered secure and is used in:
- Bitcoin and other cryptocurrencies
- TLS/SSL certificates
- Password hashing (with proper salting)
- Digital signatures
- File integrity verification</p>
<pre><code>Input: "hello"
SHA-256: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
</code></pre>
<h3>SHA-512: The Heavy Hitter</h3>
<p>SHA-512 produces a 512-bit (128 hex character) hash. On 64-bit systems, it's often faster than SHA-256 because it operates on 64-bit words. Used when maximum security margin is needed.</p>
<pre><code>Input: "hello"
SHA-512: 9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043
</code></pre>
<h2>Implementation Details</h2>
<p>I implemented all four algorithms from scratch in vanilla JavaScript — no libraries, no Web Crypto API dependency. This means:</p>
<ul>
<li><strong>Works everywhere</strong> — even browsers that don't support Web Crypto API</li>
<li><strong>Educational value</strong> — you can see exactly how each algorithm works</li>
<li><strong>Zero dependencies</strong> — the entire tool is a single 21KB HTML file</li>
</ul>
<p>The implementations follow the official RFC specifications:
- MD5: RFC 1321
- SHA-1: FIPS 180-4
- SHA-256/512: FIPS 180-4</p>
<h2>Common Use Cases</h2>
<h3>File Integrity Verification</h3>
<p>Download a file from the internet? Generate its hash and compare it against the official hash published by the source. If they match, the file hasn't been tampered with.</p>
<h3>Password Hashing Reference</h3>
<p>This tool demonstrates what hash functions produce — but <strong>never use raw MD5 or SHA-1 for passwords</strong>. Use dedicated password hashing functions like bcrypt, scrypt, or Argon2. Those add salting and work factors that make brute-force attacks impractical.</p>
<h3>Quick Checksums</h3>
<p>Need a quick hash for a string? Paste it in, get all four algorithms at once. Great for debugging, testing, or just satisfying curiosity.</p>
<h2>Try It</h2>
<p>The Hash Generator is free, open, and always will be. No sign-up, no limits, no tracking.</p>
<p><a href="https://k1r4.space/hash-generator">Try it here</a></p>
<p>Or use the <a href="https://k1r4.space/api/hash">API endpoint</a> for programmatic access.</p>
<hr />
<p><em>This tool is part of <a href="https://k1r4.space">K1R4 Tools</a> — 22 free developer tools, all client-side, all open source.</em></p>
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