IgorWare Hasher calculates SHA-1, MD5 and CRC32 hashes for single files and text.

IgorWare Hasher is a free and portable SHA-1, MD5 and CRC32 hash generator for files and text. It can be used to generate checksums for a single file and save cheksums in verification files (.sha, .md5 and .sfv) or verify its integrity by using verification files generated by Total Commander and FreeComander. Supports UTF-8 verification files. Verification files will be loaded automatically if found.

It’s very lightweight, designed to be portable so it doesn’t use registry to store it’s settings.
Automatically loads verification hash values from clipboard and files.
It can save hash values to verification files and/or copy hash values to clipboard.

It’s meant for users who need to check file integrity, users who usually download a lot of files from the internet…