Frequently Asked Questions

Basic concepts

What is the MD5 hash (checksum)?

What is the MD5 Algorithm?

What is the MD5 checksum?

What is the Cyclic Redundancy Check (CRC, CRC32)?

What is the Simple File Verification (SFV)?

What is an avalanche effect?

What they ask about FastSum

What is the Checksum file?

Is the file corrupted if the checksums do not match?

How to interrupt the calculating or verifying process?

Is it possible to calculate and verify files through the network?

How to uninstall the program?

Do you plan to release a version for Linux, Unix or MacOS?


Do you have something special for the web site developers?

Free Download! The two integrity checkers based on cryptographic approved MD5 checksum algorithm in the one package!