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Quick answers.

›Why should I check a file checksum?

Verifying a checksum ensures the file was not corrupted during transit and has not been maliciously altered by a third party. It confirms the file on your disk is bit-for-bit identical to the source.

›Which hash algorithm should I use?

SHA-256 is the current industry standard for security. MD5 and SHA-1 are faster but are now considered mathematically weak and should only be used for basic error checking or matching legacy signatures.

›Are my files uploaded to your server?

No. The browser reads the file locally and calculates the hash using your device hardware. Large files may take a few seconds to process depending on your local disk and CPU speed.

›What does a mismatch mean?

If the calculated hash does not match the provided signature, the file is different from the original. This usually indicates an incomplete download, but it can also signal that the file has been tampered with.