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nomacs

Free#12 of 33 in Photo Viewer SoftwareFile Viewer Software

nomacs: A capable open-source viewer for RAW, PSD, comparison, metadata, and batch workflows. Ranked #12 of 33 in Photo Viewer Software by our editors (7.5/10); pricing: Free plan; best for open-source users needing comparison and batch tools.

7.5/10Editor score
Visit nomacs
nomacs7.5 Visit nomacs

At a glance

  • Editor score
    7.5 / 10
  • Pricing
    Free plan
  • Best for
    Open-source users needing comparison and batch tools
  • Free plan
    Yes
  • Paid from
    Free
  • Side-by-side compare
    Yes
  • Founded
    2011
  • Facts checked
    20 Sep 2026
nomacs screenshot

  • Where it wins

    • Supports common formats, including RAW and PSD
    • Synchronized viewers enable direct image comparison
    • Batch processing and command-line options support repeatable workflows

  • Where it doesn't

    • RAW support depends on the build or relevant plugins
    • Desktop-focused rather than a mobile photo viewer
    • Supported formats and platforms can vary by build configuration

Our verdict on nomacs

nomacs is a free, open-source desktop image viewer for Windows, Linux, and macOS, with support also listed for FreeBSD, OS/2, and other systems. It suits photographers, designers, and technical users who need more than basic image opening. The viewer handles common formats, including RAW and PSD, while folder thumbnails, a file explorer panel, filename filtering, and image caching support image-heavy directories. Metadata and histogram displays add inspection tools, and synchronized viewers allow images to be compared in parallel.

Its strongest fit is a workflow that combines viewing, comparison, and light editing. Brightness, contrast, saturation, hue, gamma, and exposure adjustments are available alongside cropping, resizing, and rotation. nomacs can also browse images inside ZIP or Microsoft Office files, then apply batch processing or command-line options for repeatable operations. These features give it broader utility than a viewer limited to opening files, while keeping the product centered on desktop image handling rather than a full cataloging or asset-management system.

The open-source model and free availability make nomacs suitable for private and commercial use under the GNU General Public License v3. Users should pay attention to build configuration: RAW support depends on a LibRaw-enabled build or relevant plugins, and supported formats and platforms can vary. Choose nomacs if you want a cross-platform, open-source viewer with comparison, metadata, adjustments, and batch capabilities. Choose another option if you need a mobile-first experience or require identical format and platform support across every installation.

Your product? Our editors can test nomacs in depth and publish a review, labelled as paid · from $149/mo →

nomacs pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on nomacs.org

nomacs fact sheet

Free planYes
Paid fromFree
Supported platformsWindows, Linux, macOS, FreeBSD, OS/2
RAW image supportYes
Side-by-side compareYes
Contact sheetsNot verified
Color managementNot verified
Metadata viewerYes
DeploymentDesktop
PlatformsWindows, macOS, Linux
SupportCommunity, Docs
Built forSolo, Small business (editorial estimate)
PricingFree plan
Websitenomacs.org
Facts checked20 Sep 2026

Alternatives to nomacs

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Also Ranked In

nomacs is ranked in 2 of our directories.

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Featured on iTechGuides

Featured on iTechGuides — nomacs 7.5/10

nomacs is listed in our Photo Viewer Software directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/nomacs/"><img src="https://www.itechguides.com/best/badge/nomacs.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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