ImageMagick ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF... Free Open Source Mac Windows Linux iPhone iPad ... Xfce Batch image manipulation Watermarking Add a feature 118 Like
ImageOptim ImageOptim makes images load faster. Removes bloated metadata. Saves disk space & bandwidth by compressing images without losing quality. Free Open Source Mac Remove EXIF Data Lossless Compression Support for Multiple threads PNG Compression Add a feature 66 Like
Caesium Caesium Image Compressor lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and... Free Open Source Mac Windows Linux Web Android Batch rename files Batch processing Drag n drop Multiple languages ... Portable Add a feature 32 Like
RIOT - Radical Image Optimization Tool Saving images for web/email/other media with the best compression ratio and quality is a difficult task if you don’t have the right tools. Choosing the right format then... Warning Installer contains Open Candy adware and potentially more: https://www.virustotal.com/en/file/5c69ba60d82abbf73c6ac27a0cf39b054cb5a7cbc6fc8a6cb00d4daa6e069b73/analysis/ Free Windows GIMP XnView IrfanView No features added Add a feature 75 Like
FileOptimizer FileOptimizer is a lossless file size optimizer supporting AIR, APK, APNG APPX, BMP, CBZ, DOCX, DLL, EPUB, EXE, GIF, GZ, ICO, JAR, JPEG, MNG, MP3, MPP, PNG, PPTX, ODT... Free Open Source Windows Linux Wine Drag n drop Portable Add a feature 28 Like
PNGGauntlet -Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs -No image quality is lost — only file size -Converts JPG, GIF, TIFF, and BMP files to PNG ... Free Windows Lossless Compression File Compression Works Offline PNG Compression Add a feature 28 Like
TinyPNG TinyPNG uses smart lossy compression techniques to reduce the file size of your PNG files. By selectively decreasing the number of colours in the image, fewer bytes are... Free Web PNG Compression Add a feature 15 Like
GraphicsMagick GraphicsMagick is the swiss army knife of image processing. Comprised of 282K physical lines (according to David A. Wheelers SLOCCount) of source code in the base... Free Open Source Mac Windows Linux Batch processing Add a feature 17 Like
pngquant pngquant is a command-line utility and a library for lossy compression of PNG images. The conversion reduces file sizes significantly (often as much as 70%) and... Free Open Source Mac Windows Linux No features added Add a feature 6 Like
Phatch Phatch = Photo & Batch! Phatch is a simple to use cross-platform GUI Photo Batch Processor which handles all popular image formats and can duplicate (sub)folder... Free Open Source Mac Linux Batch rename files Batch processing Drag n drop Watermark images Add a feature 26 Like
PhotoBulk PhotoBulk is easy-to-use bulk image editor that lets you add text/image watermark, resize, and optimize hundreds and thousands of images or photos in just one click. ... Commercial $ $ $ Mac Batch processing Drag n drop Watermark images Image Preview Add a feature 16 Like
OptiPNG 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... Free Open Source Mac Windows Linux PNG Compression Add a feature 19 Like
pngcrush Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline. Free Open Source Windows Linux PNG Compression Add a feature 8 Like
ImageAlpha ImageAlpha is a GUI for pngnq and pngquant. It allows you to easily generate paletted PNG images with full alpha channel. These images are usually 40-60% smaller than... Free Open Source Mac No features added Add a feature 10 Like
PngOptimizer 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... Free Open Source Windows Linux PortableApps.com Portable Add a feature 16 Like
