About File Hash & Digest Calculator
Calculate cryptographic hashes (SHA-256, SHA-512, SHA-1, MD5) of local files directly in browser memory using chunked FileReader and Web Crypto APIs. Supports files of any size with zero server uploads.
Key Capabilities & Features
- Compute SHA-256, SHA-512, SHA-1, and MD5 digests
- Drag-and-drop file upload with immediate in-memory processing
- Works on ISO files, installers, ZIP archives, photos, and documents
- Export standard `.sha256` checksum verification files
- 1-Click copy to clipboard
How to Use File Hash & Digest Calculator
Select File
Drag and drop or click to choose any file from your device.
Choose Algorithm
Select SHA-256 (standard), SHA-512, or MD5.
Copy or Export
Copy the computed hash or download the verification file.
Privacy & In-Browser Execution Guarantee
100% In-Browser. Files are read directly from local disk into your browser RAM. Never uploaded to any cloud server.
Frequently Asked Questions
Are large files uploaded to your server?
No. The file is processed locally on your computer using the HTML5 File API and Web Crypto Subtle. No bandwidth is consumed and no data leaves your device.
Can I hash files larger than 1GB?
Yes! The engine reads files in chunks directly through browser memory without uploading or causing high network latency.
What is the difference between a hash and a checksum?
A checksum detects accidental file transmission errors, while a cryptographic hash also protects against deliberate, malicious tampering.