It is able to browse images in zip or MS Office files which can be extracted to a directory. Nomacs features semi-transparent widgets that display additional information such as thumbnails, metadata or histogram. You can use it for viewing all common image formats including RAW and psd images. Further you can check documentation.Nomacs is a free, open source image viewer, which supports multiple platforms. Other features are synchronizing multiple instances, synchronized zooming, synchronized panning, synchronized next/previous file, overlay of two or more instance (with changing opacity), synchronize multiple instances in the LAN, images can be sent over LAN connection, etc. model, exposure time, rating, date), show or hide the built-in histogram, perform search operations, and change your wallpaper. You can also view your photos displayed in a thumbnail list or slideshow, check the metadata (e.g. Drag 'n' Drop operation is supported or you may can add images from directory or add single image and multiple images can be browsed easily. Additionally it allows user to compare images and spot the differences between both.

It also includes other main editing features such as: crop, color correction, brightness and contrast, resize, saturation, hue, gamma, exposure, and create mosaic images from multiple pictures, etc. Specially it offers synchronization with multiple viewers on the same computer or different computers via LAN, which makes it unique application.

Nomacs is lightweight, convenient, fast and has ability to handle most of the common formats which also includes RAW images. Nomacs is a free under license GPLv3 image viewer with lot of features, it is cross-platform available for Linux, Windows and Mac.

Nomacs image viewer