checksum is a simple-to-use, no-nonsense SHA1, MD5 & BLAKE2 hashing utility for Windows, capable of creating & verifying checksums of files and folders, even whole drives, with just one or two clicks. checksum is robust, lightning fast, intuitive, and completely customizable; comes with a customizable installer, or alternatively, can be simply unzipped for 100% portable operation. Or both.

Features: True point-and-click hash creation and verification, choice of MD5, SHA1 or BLAKE2 hashing algorithms, proper UNICODE file name handling, LONG PATH support, effortless recursion (through an entire volume, if you wish), user-defined file mask groups (e.g. hash only movie files), automatic music playlist creation (m3u or pls), automatic checksum synchronization, integrated Explorer context (right-click) operation, true mix-and-match MD5, SHA1 & BLAKE2 handling (even in the same file!), automatic hash removal and updating, extensionless & invisible checksum file support, intelligent checksum file naming with dynamic tokens, supports hashing read-only volumes, CPU control, file & folder comparison,ShutDown when done, extensive logging capabilities, with intelligent log handling and dynamic log naming in plain text or XHTML+CSS, log append and auto log-rotation, drag & drop support, effortless legacy and *nix MD5/SHA1 file handling, optional *everything*, including one-file 'root' checksums, individual or folder hashes, UPPER/lowercase hashes, UTF-8 or ASCII output, dynamic ToolTip style progress, audio alerts, UNIX or Windows relative or absolute paths, ignore file types, 'quiet' operation (for scripters), and more!

If you hold down the SHIFT key when you launch checksum, you get its one-shot options dialog, where you can tailor your settings, on-the-fly, for any special jobs.

After a lengthy beta test period, and some serious thrashing by many seasoned MD5 users, we now have what could well be the best hashing utility in the world. Try it!

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