Steghide is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is SilentEye, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Steghide and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Steghide are iSteg (Free, Open Source) and Outguess (Free).
SilentEye is a cross-platform application design for an easy use of steganography, in this case hiding messages into pictures. It provides a pretty nice interface and an easy integration of new steganography algorithm and cryptography process by using a plug-ins system.
iSteg is an encryption tool used to hide a file (for example a zip archive) inside a jpeg picture. This encryption technology is called steganography. iSteg is a frontend for the opensource tool outguess 2.0. iSteg can be used to both encode and decode a hidden file.
Outguess is an advanced steganography tool. Outguess will hide your file inside the picture of your choice in easy steps : To hide a file within an image : - Select your image (container) and a file to hide (content).