gThumb review
A broad Linux photo viewer with RAW support, metadata tools, catalogs, and conversion.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
gThumb is a desktop photo viewer, browser, editor, and organizer for Linux, with a focus on GNOME environments. It covers a wide range of image formats, including PNG, JPEG, WebP, SVG, JPEG XL, HEIF, AVIF, TIFF, GIF, and RAW. That makes it suitable for Linux users who want one application for browsing images, making basic adjustments, managing files, and maintaining organized libraries rather than a viewer limited to a single format or workflow.
Its strongest differentiator is the breadth of everyday photo-management features around the viewer. Users can scale, rotate, crop, and adjust contrast, brightness, and saturation, while also viewing and editing EXIF, IPTC, and XMP metadata. File operations include copying, moving, renaming, and deleting files and folders. gThumb also supports format conversion, JPEG lossless transformations, slideshows, desktop backgrounds, catalogs, libraries, saved image searches, and importing photos from cameras. Color-profile support and RAW viewing extend its usefulness for image collections that need more than simple opening and browsing.
The product is free and open source, distributed under the GNU General Public License, with Linux as its supported platform. Its fit is strongest for users who want a broad, local desktop toolkit without a paid plan structure: a viewer, lightweight editor, organizer, converter, and metadata manager in one application. It is less suitable for people who need a multi-platform photo viewer or an editing workflow centered on advanced image manipulation. For Linux users prioritizing format coverage, file organization, metadata control, and catalog-based search, gThumb offers a focused combination of capabilities.
gThumb pros and cons
- Where it wins
- Supports common formats plus RAW, HEIF, AVIF, SVG, and JPEG XL
- Combines metadata editing, file management, catalogs, and search
- Free, open-source desktop software with camera import and slideshows
- Where it doesn't
- Available for Linux distributions rather than multiple desktop platforms
- Editing tools focus on basic adjustments such as crop, rotation, and color controls
- Designed for GNOME workflows, which may not suit every desktop environment
gThumb fact sheet, pricing and score →
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