Preview is described as 'Native macOS tool for viewing, annotating, and editing images and PDFs, offers cropping, resizing, markup tools, page rearrangement, and export to multiple formats' and is a very popular PDF Reader in the photos & graphics category. There are more than 100 alternatives to Preview for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Preview alternative is SumatraPDF, which is both free and Open Source. Other great apps like Preview are Okular, IrfanView, XnView MP and ImageGlass.
Offers quick browsing and display of various image formats, basic editing tools like crop, rotate, lossless JPEG manipulation, folder browsing as thumbnails or slideshows, supports XCF, drag-and-drop, metadata viewing, KDE integration, and plugin extensions.
PicView is a fast, free and fully customizable picture viewer for macOS and Windows 10/11. It supports virtually all image file types, including (animated) WEBP, (animated) GIF, SVG, AVIF, HEIC, PSD and many others.
Lightweight Simple Image Viewer with Slide show feature, Resize and Lossless-cut, Color correction, Rename, Multi-language and more...
PDF Viewer (aka pdf.js) is a new revolutionary extension using web standard technologies that allows you to display within Mozilla Firefox almost all PDF files found on the web without a plugin.
High-performance viewer for documents and images offering split tabs, customizable single or book layouts, portals for side-by-side sections, instant search, line highlight, annotation tools, link hints, searchable highlights, session management, and TOML config.
Qt5 image viewer with optional video support. Ability to quickly copy / move images to different folders. Can open some extra formats (JPEG-XL, AVIF, APNG, HEIF/HEIC, RAW) via third-party image plugins.
PDF viewer for macOS supports scientific papers, annotations, highlights, bookmarks, split view, exporting notes, AppleScript, multiple annotation types, bibliography integration, full-screen, search, and compatibility with various macOS versions.
Much better PDF-Presentation implementation as original Preview. Drawback : Does not handle as much file-formats, but only PDF
gThumb is an image viewer and browser for the GNOME Desktop. It also includes an importer tool for transferring photos from cameras.
Read, annotate, and highlight PDFs, fill interactive forms with saved input, underline or strike through text, manage bookmarks, sync files from cloud services, and share documents. Compatible with Preview and Adobe Acrobat annotations, supporting extensive iOS features.
MS Paint for the Mac. Native, free and open source: blank canvas at any size, drop one image onto another, crop, and mark up screenshots.
Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .
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Skim is the best PDF viewer for macOS ever. It is especially great for working with scientific papers, since it has several exclusive tools for making notes and syncs with LaTeX editors