Apps similar to OpenShelf include Dinky, which is free and open source. Other options are GetCompress, ImageOptim, TinyFast and RasterFox. There's no shortage of Image Optimizers like OpenShelf, with more than 25 alternatives for Mac, Windows, Linux, the web and Android.
Free macOS tool for compressing images, videos, and PDFs—just drag and drop to support numerous formats, flatten or rewrite PDFs, remove metadata, set size targets, preserve quality, and save compressed files alongside originals without internet required.
United States
Desktop app for offline batch compression and conversion supporting over 100 formats, including images, videos, GIFs, and PDFs. Features drag-and-drop, reusable presets, folder monitoring, preview, trimming, clipboard compression, context menu, shortcuts, and automation.
United Kingdom
ImageOptim is excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop). It's useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode to allow better optimization).
Poland
EU
Compress images, videos, and PDFs directly on your Mac with local batch processing, no internet required, and full privacy. Features drag-and-drop workflow, smart quality preservation, on-device optimization, and subscription options for premium tools.
MaltaEU
Native macOS image compression for JPEG, PNG, WebP, and AVIF, with batch processing, AI upscaling, and background removal.
United States
Offers lossless image compression and batch processing with full control for JPEG, PNG, GIF, WebP, SVG, and modern formats on Mac. Fully offline, never uploads files—drag, drop, automate with folders, convert formats, strip metadata, and use reusable custom profiles.
SpainEU
Dropover is a macOS utility that makes Drag and Drop easier. Use it to stash, gather or move any draggable content without having to open side-by-side windows.
TrimrPix shrinks image file sizes on your Mac without visible quality loss. Supports JPEG, PNG, GIF, WebP, AVIF, and HEIC. Drag, drop, done — fully offline, no subscriptions.
DenmarkEU
Morpholder is a lightweight menu-bar utility that completely changes how you convert files on macOS. Instead of opening clunky converter apps, uploading sensitive files to websites, or remembering terminal commands, you simply change the file's extension in Finder.
Permute is the easiest to use media converter with its easy to use, no configuration, drag and drop interface; it will meet the needs to convert all your media files.
CzechiaEU
OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
Experience up to 90% file size reduction for videos and images while working entirely offline to ensure privacy. Supports conversion to GIF and is compatible with formats like MP4 and WebM. Enhances productivity by allowing batch processing and provides multiple quality options.
Singapore
Romania
