Question 1

What is a file checksum?

Accepted Answer

A file checksum is a fixed-size hash value computed from the file contents. It acts as a fingerprint — if even one byte changes, the checksum will be completely different.

Question 2

Why should I verify file checksums?

Accepted Answer

Verifying checksums ensures that a downloaded file has not been corrupted during transfer or tampered with by a malicious actor.

Question 3

Is my file uploaded to a server?

Accepted Answer

No. The file is processed entirely in your browser using the Web Crypto API. It never leaves your device.

Question 4

What is the maximum file size?

Accepted Answer

This tool supports files up to 100 MB. Larger files may cause browser performance issues.

Question 5

Which hash algorithm is used?

Accepted Answer

This tool uses SHA-256, which produces a 256-bit (32-byte) hash rendered as a 64-character hexadecimal string.

Question 6

Can I compare two file checksums?

Accepted Answer

Yes. After computing the hash, you can paste an expected checksum to verify it matches the computed value.

File Checksum Calculator

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