pngcrush

Pngcrush is an optimizer for PNG (Portable Network Graphics) files.

BIMP

With BIMP you can apply a set of manipulations to an entire group of images!

Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000

FileOptimizer is a lossless file size optimizer supporting AIR, APK, APNG APPX, BMP, CBZ, DOCX…

The most advanced dual pane file manager and file transfer client for macOS.

Lets you resize images by right-clicking.

ImageMagick is a software suite to create, edit, and compose bitmap images.

Faster web pages and apps.

JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists

Jimp is an image processing library written entirely in JavaScript for Node.

OptiPNG is a command-line PNG optimizer that recompresses image files to a smaller size, without…

Advanced image optimization tool

‘-Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs

PhotoResize is a simple tool for very fast batch resizing of photos and pictures in JPEG format.

PngOptimizer compresses graphics files and removes extra, unnecessary data without affecting…

Command-line PNG optimizer.

XnConvert is an easy image converter for graphic files, photos and images available on Windows…

iLoveIMG is one of most powerful solution that comes with all the major tool you cloud want to edit images in bulk.