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Files hash digest calculator to verify download integrity compared to publishers original calculation results. Files MD5, SHA1, SHA2 checksum calculation and comparison easy within the browser.

Efficient by design using background worker threads to offload all calculations leaving the browser and other tabs responsive.

Some relevant links:
Wikipedia - https://en.wikipedia.org/wiki/Cryptographic_hash_function
OpenSSL - https://www.openssl.org/docs/man1.1.0/apps/dgst.html
Microsoft File Checksum Integrity Verifier - https://www.microsoft.com/en-us/download/details.aspx?id=11533
Apple Mac Computer, Checking an MD5 Checksum on - http://www.resourcesforlife.com/docs/item1428