About the File Hash Calculator

What this tool does

The File Hash Calculator computes cryptographic hashes for any file on your device. Results are displayed for each selected algorithm so you can verify downloads, share checksums with collaborators, and confirm file integrity during incident response or archival tasks.

How it works

All hashing runs locally in your browser using the Web Crypto API for modern algorithms. MD5, which is not exposed by Web Crypto, is computed with a client-side library. Your file never leaves your device and no network requests are made during hashing.

• SHA-256 and SHA-512 use the browser’s built-in cryptography interface.
• SHA-1 is provided for legacy validation and should not be used for new security decisions.
• MD5 is included for compatibility with older checksum listings.

Supported algorithms

• MD5
• SHA-1
• SHA-256
• SHA-512

Open the main tool and choose one or more algorithms from the selector. The calculator will produce a hex string for each selection.

Privacy and security

• No file uploads. Hashing is performed entirely in memory on your device.
• No telemetry. The page does not send hashes or filenames to any service.
• Accessible design with keyboard support and clear focus indicators.

Quick start

• Open the tool and select the algorithms that you want.
• Drag and drop a file into the drop zone, or choose a file with the picker.
• Copy any checksum with the Copy button next to the result.
• Use Ctrl + P or the Print button on this page if you want a printable overview.

Known limitations

• Very large files can be memory-intensive in some browsers. If you experience issues, try a modern desktop browser.
• SHA-1 and MD5 should not be used to make new security decisions. Prefer SHA-256 or SHA-512 for integrity checks.

References

• NIST Hash Functions Project
• ISO/IEC 10118 Information Technology — Security Techniques — Hash Functions