Apps similar to ImageOptim include ImageMagick, which is free and open source. Other options are Caesium Image Compressor, Dinky, FileOptimizer and OptiImage. Image Optimizers like ImageOptim are a crowded field, with more than 100 alternatives for Windows, the web, Mac, Linux and Android.
Process images in bulk securely in your browser, no uploading necessary. It's private, fast, and easy! Upload all major image formats, resize, crop, compress, and convert images all at once.
United States
Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images. It handles JPGs, GIFs and PNGs.
Simple local image converter for Windows and Linux, built to optimize images into WebP and AVIF without upload or download steps.
Austria
EU
Compress hundreds of images in seconds. Everything stays on your computer. No uploads, no accounts, no subscription.
United States
Compress Tool provides Free Online Web and Image Tools for JPG, JPEG, PNG, GIF, BMP, ICO, HEIC and WEBP! It supports all image formats for Compression and Converters!.
ETK Image Compressor Pro is a fast, lightweight Windows app that drastically reduces image file sizes while keeping excellent visual quality. Supports adjustable quality for WebP,PNG, TGA, EXR, JPEG, batch compression, 8K images, and works fully offline.
Free native macOS image compressor for Apple Silicon. Drop PNG, JPEG, GIF, SVG, WebP, AVIF or HEIC files onto the window and get smaller copies beside the originals.
Canada
Free browser tool for compressing, converting, and resizing bulk JPEG, PNG, WebP, and AVIF images entirely locally with WebAssembly, offering fast, private, unlimited processing, multi-core support, offline use, and ZIP export that keeps folder structure.
FranceEU
Fast, 100% offline, privacy-first image compressor and HEIC/WebP converter running locally in your browser via WebAssembly.
Modernize your WordPress media library with high-performance WebP/AVIF conversion, AI-powered auto-tagging, and zero-load cloud optimization.
Canada
A free web app providing 200+ online tools for developers, including JSON formatters, PDF mergers, code converters, data generators, and more—no signup required.
India