Question 1

Is the file uploaded to a server?

Accepted Answer

No, the file is read and hashed entirely in your browser — it never leaves your device.

Question 2

Why is MD5 still offered if it's insecure?

Accepted Answer

MD5 is no longer suitable for security purposes but is still widely used for quick file-integrity checksums.

Question 3

Is there a file size limit?

Accepted Answer

Files above roughly 200 MB aren't hashed, since the MD5 implementation runs in pure JavaScript and would freeze the tab on huge files.

Question 4

How are SHA-1 and SHA-256 computed?

Accepted Answer

They use the browser's native Web Crypto API, which is fast and available in every modern browser.

Question 5

Can I verify a downloaded file's checksum?

Accepted Answer

Yes, hash the downloaded file and compare the result to the checksum published by the file's source.

Hash Generator

How to use it