HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and modifying of main memory (RAM), handles files of any size.
The easy to use 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.
TAKE NOTE!: This one here hosted in this site is the portable edition of this program... in a form of a setup program, and can be run with minimal privileges (no admin rights required!). For the portable edition, the setup program writes only into the selected folder (e.g., USB thumb drive).