nomacs
nomacs 3.23.3 Beta is a lightweight cross-platform image viewer for Windows, Linux, macOS and FreeBSD with RAW and PSD support, zooming, thumbnails, color management and plug-ins.
What nomacs does
nomacs is a lightweight viewer for fast folder browsing and format inspection across several platforms. It supports common images and selected RAW, PSD and other formats, with thumbnails, zoom, color management and plug-in extensions. It is useful for first-pass selection rather than a full image-editing workflow.
Beta and package boundaries
Version 3.23.3 Beta is represented here with Windows, macOS, Linux and FreeBSD resources. A beta build can include newer fixes and features while being less predictable than a stable release. Keep a stable or portable copy for important work and match Qt and image-format plug-in versions on Linux.
Format, color and file safety
RAW, PSD, TIFF and other formats preserve different layers, profiles, metadata and compression behavior. A viewer's rotation, save or conversion command can change a file, so copy important images into a test directory and verify the target format and color profile before writing.
Selection and rollback workflow
Start with thumbnails, sorting, zoom and color management on a small sample. Separate keep, review and process folders, record dimensions and metadata state and test a batch rotation or conversion before applying it broadly. If the beta misbehaves, reopen originals with the stable build rather than overwriting them.
Maintenance note
Review date: 2026-08-23. The page was checked against nomacs 3.23.3 Beta, cross-platform packages, Qt image-format plug-ins, RAW and PSD behavior, color management and rollback guidance.
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nomacs 3.23.3 Beta image browsing and color-check guide
Use JPEG, RAW or PSD samples to verify folder browsing, zoom, color profiles, format plug-ins and an update rollback plan before opening a large photo archive.
Before you start
- Choose the Windows, macOS or Linux package matching the system and prepare a test directory that cannot overwrite originals.
- If RAW, HEIC or JPEG XL is required, check image-format plug-ins and Qt compatibility before testing a full archive.
- Keep a stable build or separate configuration directory available while evaluating the beta release.
Installation steps
- 01
Install or extract the package
Use the Windows installer or ZIP, macOS DMG or a Linux AppImage or distribution package, then confirm that the user configuration directory is writable.
- 02
Check image-format plug-ins
Open a normal JPEG first, then test RAW, PSD, TIFF or another required format. If one fails, inspect plug-ins and Qt dependencies before touching the original.
- 03
Set zoom and color display
Choose a useful zoom mode and background, then compare a sample with an embedded ICC profile against the display and application color settings.
Quick start
- 01
Browse the sample folder
Use thumbnails and previous or next shortcuts in a small test directory and watch cache usage when opening large images.
- 02
Inspect detail at 100 percent
Review texture, edges and compression at 100 percent or higher, keeping interpolation artifacts separate from the quality of the source image.
- 03
Compare and record results
Toggle color configuration, zoom mode and plug-in state on the same file, record differences and send editing tasks to a dedicated image editor.
Usage tips
- Rotation, crop or save commands in a viewer can alter a file. Work on a copy when the image is important.
- PSD, RAW and TIFF differ in layers, metadata and color capability, so a preview is not a final-output proof.
- Export configuration before updating a beta build and keep the old version. Continuous builds may be useful for testing but are not automatically a stable production choice.
- Keep format plug-ins and Qt versions aligned on Linux and record the package source for a reproducible setup.
Troubleshooting and uninstall
Why is a RAW, HEIC or JPEG XL plug-in missing?
Install a package matching the system and Qt major version, then retry with a copy. If the format remains unavailable, use a stable distribution build or convert a duplicate to a common format.
Why do colors differ from another application?
Check the ICC profile, display mode and application color-management settings and compare the same embedded-profile sample. Do not adjust the original only by eye.
- Save settings and test evidenceRecord plug-in versions, color configuration and a reproducible sample path, removing private directories and sensitive data from shared diagnostics.
- Remove the application and cacheUninstall through system application management or delete the portable directory and clear thumbnails as needed. Keep originals and test samples in separate folders.
Frequently asked questions
How is nomacs different from a basic image viewer?
It focuses on cross-platform browsing, quick inspection and support for common and selected professional formats, with thumbnails, zoom, color management and plug-ins.
Is the 3.23.3 Beta suitable as the only daily viewer?
Keep a stable or portable copy for important work and test the beta with samples first. A beta can contain useful fixes while still changing behavior or exposing regressions.
What should I check when RAW or PSD looks wrong?
Check the decoder plug-in, Qt version, color profile and file integrity and compare the same file in the original editing application before saving or converting it.