HextEdit is a quality free option for viewing and editing binary data in MacOS Big Sur:

* Byte inspector

Edit bytes as little or big endian signed or unsigned integers, floats, or doubles. View values as binary, decimal, or hexadecimal numbers.

* Fast incremental find

Find strings, integers, and byte patterns in files. HextEdit has incremental background find, allowing you to continue working while searching very large files.

* Fast and native

HextEdit runs natively on both Intel-based CPUs and Apple Silicon for great performance. Built using Swift, HextEdit uses an efficient data structure for fast editing of files big or small.

* Designed for macOS

From the app icon to the full-height sidebar, HextEdit is designed to fit in with macOS and resizes well to adapt to any use case.

Download HextEdit from the Mac App Store