[ABOUT HASH FILE ONLINE]

Hash File Online was created with a simple but important mission: provide a powerful, reliable file hashing tool that respects your privacy absolutely. In an age where most online tools require uploading your files to remote servers, we took a different approach.

Every hash calculation on this website happens entirely in your web browser. Your files never leave your computer. There are no uploads, no server processing, and no data retention. This isn't just a feature—it's a fundamental design principle that guides everything we build.

We believe that verifying file integrity shouldn't require trusting a third party with your data. Whether you're checking the authenticity of a downloaded software package, verifying backup integrity, or conducting security audits, your files should remain yours alone.

Hash File Online is developed and maintained by Vladimir Lorentz, an independent software developer based in Lyon, France. With a background in web development and a passion for security tools, Vladimir created this tool to fill a gap he noticed in the available options.

"I was frustrated that most online hash calculators required file uploads," Vladimir explains. "As someone who regularly verifies software downloads and checks file integrity, I wanted a tool I could trust completely—one where I knew for certain my files weren't being sent anywhere."

The result is Hash File Online: a tool built from the ground up with privacy as the primary consideration, not an afterthought. Every feature, from batch processing to PDF report generation, is implemented entirely client-side using modern web technologies.

Our technical approach is guided by three core principles:

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  Client-Side First: All file processing, hash calculations, and report generation happen in your browser using JavaScript and WebCrypto APIs. The server only delivers the static website files—it never sees your data.
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  Industry-Standard Algorithms: We implement cryptographic hash functions exactly as specified in their standards. MD5, SHA-1, SHA-256, SHA-384, SHA-512, and BLAKE2b are all available, giving you the flexibility to match whatever checksum format you need.
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  No Dependencies on External Services: Once the page loads, Hash File Online works completely offline. No API calls, no cloud services, no external dependencies during operation. You can even save the page and use it without an internet connection.

We take your privacy seriously. Here's exactly what happens when you use Hash File Online:

• ✓ Files stay local: Your files are read directly by your browser and never transmitted anywhere.
• ✓ No file storage: We don't store, cache, or log any information about your files.
• ✓ No accounts required: Use the tool immediately without registration or sign-up.
• ✓ Minimal analytics: We use Google Analytics with IP anonymization to understand general usage patterns. No personal data is collected.
• ✓ Verifiable: As a client-side application, you can inspect our source code directly in your browser's developer tools to verify our privacy claims.

Hash File Online offers a comprehensive set of features for file verification:

• • Six Hash Algorithms: MD5, SHA-1, SHA-256, SHA-384, SHA-512, and BLAKE2b
• • Batch Processing: Hash multiple files simultaneously with progress tracking
• • Hash Verification: Compare calculated hashes against expected values instantly
• • Export Options: Generate reports in PDF, CSV, JSON, HTML, or plain text
• • Large File Support: Efficient chunked processing handles files of any size
• • Drag and Drop: Easy file selection with drag-and-drop interface
• • Offline Capable: Works without internet once loaded

Hash File Online is actively maintained and continues to evolve. Planned improvements include:

• • Additional hash algorithms (SHA-3, xxHash, and others)
• • Directory hashing with recursive file discovery
• • Hash comparison tools for detecting file changes
• • Progressive Web App (PWA) for better offline experience
• • Localization for additional languages

Have a feature request? We'd love to hear from you. Visit our contact page to share your ideas.

Hash File Online is free to use and will always remain so. If you find this tool useful, there are several ways you can support its continued development:

• • Buy Me a Coffee: Small donations help cover hosting costs and development time
• • Share the Tool: Tell colleagues and friends who might find it useful
• • Report Bugs: Help us improve by reporting any issues you encounter
• • Suggest Features: Your feedback shapes the tool's development