nomacs
nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.
EU
Features
Properties
- Lightweight
- Customizable
- Privacy focused
Features
- Multiplatform
- Image browser
- Crop images
- Support for SVG
- Ad-free
- Portable
- Extensible by Plugins/Extensions
- Dark Mode
- No registration required
- Frameless
- Works Offline
- Open PSD files
- Multi panel
- Auto-Refresh
- Built-in editor
- Batch processing
- Image Sharing
- Support RAW file formats
nomacs News & Activities
Recent News
Recent activities
gzaal added nomacs as alternative to MetaScope - Metadata Studio- Balajitechlabs liked nomacs
lunartidesoftware added nomacs as alternative to MediaExplorer- ILoveDragons reviewed nomacs
My personal favorite image viewer. Has everything I want from it, simple ui, arrow key navigation, esc to close, and foss. One interesting quirk about it ive noticed is that i don't think nomacs has built in image decoders, it will open anything your os can. But that is an easy fix.
- DekitateBread reviewed nomacs
This is the best picture viewer if you're using non-default Windows explorer. I've tried likely every single image viewer programs, and this one is just simple, very fast, lightweight, it covers all my need and habit as casual user. And it got updated in 2026 with sleeker UI!
Featured in Lists
These are all the software I use on my windows machine. I am privacy freak. So, I mostly use open source software. …
(in progress) The higher the level - the lower the level of comfort and stability, but higher the level of freedom …
only free, mostly open-source
What is nomacs?
nomacs is a small, fast image viewer able to handle the most common image formats including RAW images. Additionally it is possible to synchronize multiple viewers. A synchronization of viewers running on the same computer or via LAN is possible. It allows to compare images and spot the differences (e.g. schemes of architects to show the progress).
nomacs information
Developed by
Markus Diem, Stefan Fiel and Florian Kleber Licensing
Open Source (GPL-3.0) and Free product.Written in
Rating
Average rating of 4.6Alternatives
104 alternatives listedSupported Languages
- English
AlternativeTo Categories
Photos & Graphics, Web BrowsersGitHub repository
- 3,112 Stars
- 197 Forks
- 327 Open Issues
- Updated
Comments and Reviews
Very complete. Easy, small and simple. One feature to underline is you can print images from it. Strange as it sounds, there's a bunch of good image viewers and editors in linux but astoundingly, many lack that option.
How is this "very complete" when it can't even move images?!
Appears to be discontinued. No release for more than 4 years and open source repository is very quiet.
As of Feb 2025, the repo is quite active but still no new releases (on Github, at least) so you'll need to build from source or use a package manager
Not the case anymore as on Dec 28, 2025 a non-beta release of 3.22.0 has been released. As of this comment, currently on release 3.22.1 published on April 17, 2026
My personal favorite image viewer. Has everything I want from it, simple ui, arrow key navigation, esc to close, and foss. One interesting quirk about it ive noticed is that i don't think nomacs has built in image decoders, it will open anything your os can. But that is an easy fix.
This is the best picture viewer if you're using non-default Windows explorer. I've tried likely every single image viewer programs, and this one is just simple, very fast, lightweight, it covers all my need and habit as casual user. And it got updated in 2026 with sleeker UI!
better than preview. customizable. easy to use. lots of features.
Open source, has all the tools that I need from a image viewer, is lightweight, easy to navigate, fast and simple
Nomics can't organize images - no function to move an image to a directory, for example.
@Brandonator Look for apps in the "photo manager" category if you want that kind of function, don't expect a simple image viewer to handle organizing. Photo manager obviously needs a built-in viewer, but the opposite isn't true.
Very good simplified image editor/cropper. Three requests: 1. pdf cropper ability 2. change the icon.. I am keenly aware of the issues of those struggling with alcohol which is a major epidemic. 3. Thumbnail size options. Thumbnail strip option is too tiny.