Download Nomacs — Fast Lightweight Image Viewer for Windows PC v3.22.4 for Windows PC

Nomacs is a fast, free and open source image viewer that opens photos, RAW files and PSDs quickly, with thumbnail previews, metadata display, batch tools...

Features

• Opens photos, RAW camera files and PSD documents quickly without plug-ins or long loading delays even on older laptops with limited memory available.
• Thumbnail previews and a clear metadata panel make culling shoots and checking camera settings easy without opening a separate editor or converter program.
• Batch rename and batch conversion handle whole folders of images in a single operation without any manual renaming of individual files afterwards.
• Synchronised instances mirror pan and zoom, making side-by-side comparison of similar shots genuinely fast especially when checking focus across an entire burst.
• Multi-page TIFF and PDF browsing turns it into a handy viewer for scanned documents too without installing a heavyweight document suite at all.

Considerations

• Editing tools are basic, covering crops and simple corrections but nothing approaching a real photo editor so serious retouching still requires dedicated software.
• The interface is plain and functional, with some preferences buried deeper than new users expect though the layout becomes familiar after regular use.
• Version 3.22.4 is the current stable release, while the newer 3.23.x line is still only a pre-release so most users should stay on the stable build.

Nomacs is a free, open-source image viewer released under the GPL, built to open pictures quickly and then get out of the way. Version 3.22.4 handles everyday formats alongside RAW camera files and PSD documents, with a thumbnail strip for the current folder so you can move through a shoot without reopening a file dialog each time.

The metadata panel is central to real use. It shows EXIF camera settings and other embedded information next to the picture, so you can check shutter speed, ISO, lens or date while you are still deciding whether the frame is a keeper. For documents, multi-page TIFF and PDF files can be browsed page by page, which makes scanned paperwork viewable without a heavy office suite.

Two features lift it above a basic viewer. Batch rename and batch conversion apply a naming pattern or a format change to a whole folder in one operation, useful straight after importing a camera card. And synchronised viewing links multiple running instances, so panning and zooming in one window is mirrored in the others. That is ideal for comparing two near-identical exposures at exactly the same spot and scale.

Basic corrections such as cropping, resizing and exposure adjustment are included, but they are deliberately light. Nomacs stays leaner than XnView MP by focusing on viewing, sorting and quick checks first.

Nomacs is for photographers, teachers, office staff and anyone who opens a lot of images and is tired of waiting for a heavy suite to start. If your job is culling a shoot, checking whether a RAW file is sharp, comparing two versions of the same scene, or renaming a folder of scans consistently, its speed and metadata view fit that job directly.

It also suits users on older or modest laptops. The program is lightweight, free and open source, with no account, no ads and no upsell, so it works well in classrooms, small offices and shared machines where installing a large commercial package makes little sense.

It is not for serious photo editing or RAW development. Cropping and simple corrections are as far as it goes, so retouching, layers, masks and careful colour work still need a dedicated editor or converter. Anyone who wants a polished media library with face tagging, cloud sync and elaborate organising tools will also find Nomacs too plain and functional.

In short, choose Nomacs if viewing is the bottleneck in your day. If editing is the bottleneck, pair it with a proper editor and let each program do the part it is good at.

A teacher comes back from sports day with 340 photos on a camera card, a mix of JPEGs and RAW files, and needs twenty good shots for the school noticeboard by the next morning. She copies the folder to her laptop and opens the first image in Nomacs.

Using the thumbnail strip, she moves quickly through each race in order. The metadata panel tells her at a glance which frames used a fast enough shutter speed, and the blurred ones are obvious without opening an editor. For the finish-line burst, where three frames look almost identical, she opens two of them in separate Nomacs windows and turns on synchronisation.

Zooming into the runners in one window moves the other window to exactly the same place. The sharpest eyes and clearest expressions are easy to spot, and she keeps one frame instead of guessing.

Once the keepers are chosen, batch rename gives them a clean pattern with the event name and a number, and batch conversion creates smaller copies for sharing with parents. By the end of the evening she has a tidy folder of twenty named, checked images ready to print, without ever opening a heavy photo suite.

Download nomacs-setup-x64.msi for Nomacs version 3.22.4 and save it to your Downloads folder.

Double-click nomacs-setup-x64.msi, accept the open source licence, and follow the setup wizard, choosing whether to associate common image formats with Nomacs.

Launch Nomacs, open any image, and use the thumbnail strip to browse the rest of that folder without reopening the file dialog.

Is Nomacs — Fast Lightweight Image Viewer for Windows PC free and open source?

Yes. Nomacs — Fast Lightweight Image Viewer for Windows PC is completely free and open-source software. You can download and use it at no cost, and its source code is publicly available.

Can Nomacs open RAW photos from my camera?

Yes. Nomacs reads common RAW formats from major camera makers and displays them directly, including the embedded metadata. For serious RAW development you would still use a dedicated converter, but for viewing, culling and quick checks Nomacs is fast and reliable.

How does the image synchronisation feature work?

Open the same or different images in two Nomacs windows and enable synchronisation, and panning or zooming in one window is mirrored in the other. It is designed for comparing similar shots, such as two exposures of the same scene, at exactly the same position and scale.

Should I install the 3.23.x version instead of 3.22.4?

For everyday use, no. Version 3.22.4 is the current stable release, while 3.23.x is a pre-release intended for testing. Install the pre-release only if you want to try upcoming changes early and accept that some things may still be unfinished.

Can Nomacs rename or convert a whole folder of photos at once?

Yes, batch rename and batch conversion are built in. You can apply a naming pattern with numbering to a selection of files, or convert a folder between formats, which is useful after importing a camera card or preparing images for sharing.