Apps similar to PngOptimizer include Caesium Image Compressor, which is free and open source. Other options are Dinky, GetCompress, ImageOptim and TinyFast. You're spoiled for choice with Image Optimizers like PngOptimizer: we list more than 50 alternatives for Mac, Windows, Linux, the web and Android.
Leanify is a lightweight lossless file minifier/optimizer. It removes unnecessary data (debug information, comments, metadata, etc.) and recompress the file to reduce file size. It will not reduce image quality at all.
Don’t spend another second worrying about compressing your images. Install Imgbot into your GitHub projects, and focus on your application.
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
Compress or convert images on the web with offline support. Images are not uploaded on server and processed on client with webassembly. Support for formats like JPEG, PNG, WebP, AVIF and JXL.
Crunch - Insane(ly slow but wicked good) PNG image optimization. It combines selective bit depth, color type, and color palette reduction with zopfli DEFLATE compression algorithm encoding using embedded versions of the pngquant and zopflipng PNG optimization tools.
Squeezer is a PNG optimizer for Mac OSX that recompresses image files to a smaller size, without losing any information.
Switzerland
Optimize pictures without quality lossless. With Black Bird Image Optimize - you can reduce the size of your photos several times without quality loss!.
Ukraine
Fast, 100% offline, privacy-first image compressor and HEIC/WebP converter running locally in your browser via WebAssembly.
Squash is a simple, powerful app for compressing and converting images for the web and more. Simply drop an image into Squash and it reduces the filesize while maintaining its quality.
United Kingdom
In this fast-paced digital era, vast numbers of photos and images often saturate storage spaces. Zipic, an efficient image compression tool, quickly addresses the issue of insufficient storage. Whether reducing the size of social media images or simplifying document images...
IMAGEmini, a powerful photo resizer and optimizer, allows you to optimize all your photos by 80% ~ 20% comparing to their originals while keeping their original resolution, quality and png, jpg, gif formats.
China
Mass Image Compressor is easy to use - a point and shoot batch image compressor and converter tool for Web site optimization, photographers, HTML game creator and casual Windows users.
