Apps similar to DropSlim include Caesium Image Compressor, which is free and open source. Other options are ImageOptim, XnConvert, TinyFast and GetCompress. You can choose from more than 10 Image Optimizers like DropSlim for Mac, Windows, Linux and the web.
PngOptimizer compresses graphics files and removes extra, unnecessary data without affecting quality. It will update PNG files or converting BMP, GIF or TGA files to the PNG format using simple drag-and-drop.
ImgSmaller is a privacy-first image compression tool that lets you compress JPG, PNG, and WebP images directly in your browser. No data leaves your device thanks to our Zero-Upload Mode. If your browser doesn't support this, the image is temporarily uploaded to our server...
