Where does the hashing happen?

Entirely in your browser using the Web Crypto API. The file is never uploaded.

MD5 is no longer cryptographically secure, but it's still widely used for file integrity checks (e.g. checking a downloaded ISO matches its checksum).

File Hash & Checksum Calculator

Verify file integrity by computing its cryptographic hash — drag a file or paste text and get MD5, SHA-1, SHA-256, and SHA-512 instantly.

Drag a file here, or click to browse

No file selected

MD5 SHA-1 SHA-256 SHA-384 SHA-512

Verify Checksum

Expected hash

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How to use File Checksum

Drag a file or paste text.
The hashes compute automatically.
Optionally paste an expected hash to verify.
Copy any hash with a single click.

What is File Checksum?

Use the browser's built-in Web Crypto API to hash a file or paste text. Compare a computed hash against an expected value to check if the file was modified in transit.

FAQ

Where does the hashing happen?: Entirely in your browser using the Web Crypto API. The file is never uploaded.
Is MD5 secure?: MD5 is no longer cryptographically secure, but it's still widely used for file integrity checks (e.g. checking a downloaded ISO matches its checksum).

Related tools

Author

Marcus Webb"The DevTool Craftsman"

Full-Stack Developer & Tools Architect

Marcus has been writing code since the dial-up era. He's contributed to open-source developer tools and built CI/CD pipelines for startups.

📖 "File Checksum" on Wikipedia·"Developer Tools" on Wikipedia·"File Checksum" on Britannica

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Last updated: 2026-06-04