nomacs
- Android app
- Not listed
- Free plan
- Yes
- Runs on
- Linux, Mac, Windows
Summary
nomacs is a free, open-source image viewer for Windows, Linux and macOS. It handles common image formats, including RAW and PSD, with supported formats depending partly on image plugins and optional build features. Semi-transparent panels can show thumbnails, image metadata and histograms, and users can add notes. The viewer can browse images inside ZIP or MS Office files, preview folder thumbnails and filter filenames using text or regular expressions. Image adjustments include brightness, contrast, saturation, hue, gamma and exposure, as well as pseudo-color rendering. For comparison, separate nomacs instances can synchronize panning and zooming, and images can be overlaid at different opacity. The project is licensed under GNU General Public License v3 and is free for private and commercial use. Downloads are listed for Windows, Linux and macOS; the introduction also lists FreeBSD and OS/2 as supported systems. The FAQ notes that Windows XP and Vista are not supported for future development since version 3.0, though version 2.4.6 can be used on those systems.
Who it is for
nomacs suits people who want a free image viewer with metadata, basic adjustments and comparison tools. It may also fit image-processing users comparing work at different stages.
What is good
- Free for private and commercial use
- Displays metadata, thumbnails and histograms
- Can compare images with synchronized zoom and overlays
- Browses images inside ZIP and MS Office files
What to know first
- Format support varies with plugins and build options
- Windows XP and Vista are unsupported in future development
Verdict
nomacs pairs image viewing with browsing, adjustment and comparison functions at no cost. Check format support for the specific build, since it depends partly on plugins and optional features.
nomacs plans and pricing
All plansCompared on photo viewer software
- Free plan
- Yesnomacs.org
Facts
- Product
- nomacs is a free, open-source image viewer for viewing common image formats, including RAW and PSD images.nomacs.org · 2 Oct 2026
- Image information
- Semi-transparent widgets can display thumbnails, metadata, and histograms; users can add notes to images.nomacs.org · 2 Oct 2026
- File browsing
- nomacs can browse images in ZIP or MS Office files, show a folder thumbnail preview, and filter filenames by text or regular expression.nomacs.org · 2 Oct 2026
- Editing
- Image adjustments include brightness, contrast, saturation, hue, gamma, and exposure, as well as pseudo-color false-color images.nomacs.org · 2 Oct 2026
- Image comparison
- Multiple nomacs instances can synchronize panning and zooming, and images can be overlaid at different opacity for comparison.nomacs.org · 2 Oct 2026
- Formats
- The documented format support depends partly on Qt image plugins, KImageFormats, and optional build features such as ENABLE_RAW and ENABLE_TIFF.nomacs.org · 2 Oct 2026
- Downloads
- The installation page lists Windows 64-bit installer and portable packages, Linux packages and Flatpak/AppImage, and macOS arm64 and x86_64 builds.nomacs.org · 2 Oct 2026
- Other supported systems
- The introduction also lists FreeBSD and OS/2 as supported platforms.nomacs.org · 2 Oct 2026
- License and use
- nomacs is licensed under GNU General Public License v3 and is free for private and commercial use.nomacs.org · 2 Oct 2026
- Integrations
- The FAQ describes its original purpose as helping image-processing users compare images at different processing stages.nomacs.org · 2 Oct 2026
- Support
- The documentation directs users to the project tracker to report bugs or request features, and invites contributions such as translations, ports, and code.nomacs.org · 2 Oct 2026
- Windows compatibility
- The FAQ says Windows XP and Vista are not supported in future development since nomacs 3.0, though version 2.4.6 can be used on those systems.nomacs.org · 2 Oct 2026
Company
- Founded
- 2011nomacs.org · 28 Sept 2026
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Sources
- nomacs.org/docs/getting-started/introduction/· checked 2 Oct 2026
- nomacs.org/docs/documentation/features/· checked 2 Oct 2026
- nomacs.org/docs/getting-started/installation/· checked 2 Oct 2026
- nomacs.org/docs/help/faq/· checked 2 Oct 2026
- nomacs.org· checked 28 Sept 2026