HxD is a freeware easy to use hex editor which helps you to edit files up to 8EB, HDD drives, floppy disks, ZIP-disks, USB flash drives, CDs even your RAM.
This carefully designed and fast hex editor can instantly open and edit files of any size. It's user friendly interface offers features such as searching and replacing, exporting, checksums/digests, insertion of byte patterns, a file shredder, concatenation or splitting of files, statistics and much more. HxD works like a text editor with a focus on a simple and task-oriented operation.
HxD works on Windows 95, 98, ME, NT 4, 2000, XP, 2003 or Vista
There are installable and portable versions of HxD in multiple languages. To install portable version just extract the "zip" file into a folder and run "HxD.exe".