Free tool to compress your images online. Compress multiple images at once. No limit on number of images. Transparency support for png.

Caesium Image Compressor is described as 'Lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and multiple image processing at the same time, everyone will be able to reach the best result' and is a popular Image Optimizer in the photos & graphics category. There are more than 100 alternatives to Caesium Image Compressor for a variety of platforms, including Windows, Web-based, Mac, Linux and Android apps. The best Caesium Image Compressor alternative is Image Toolbox (Resizer), which is both free and Open Source. Other great apps like Caesium Image Compressor are ImageOptim, OptiImage, FileOptimizer and TinyFast.
Free tool to compress your images online. Compress multiple images at once. No limit on number of images. Transparency support for png.

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.
AdvanceCOMP is a collection of recompression utilities for your .ZIP archives, .PNG snapshots, .MNG video clips and .GZ files.
Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images. It handles JPGs, GIFs and PNGs.

Icecream Image Resizer is a program for professional image resizing that features options for completing all sorts of tasks. Program’s clear and intuitive interface and simple and effective controls give the best user experience one can think of while resizing images.




Phatch is an user friendly, cross-platform Photo Batch Processor and Exif Renamer with a nice graphical user interface. Phatch handles all popular image formats and can duplicate (sub)folder hierarchies.



Optimize pictures without quality lossless. With Black Bird Image Optimize - you can reduce the size of your photos several times without quality loss!.




free online image compressor for faster websites! reduce the file size of your webp, jpeg, and png images with tinypng.


A powerful photo resizer and optimizer for Mac, allows you to optimize all your photos by 80% ~ 20% comparing to their originals while keeping their original resolution, quality.



Find, resize, crop, watermark, enhance, adjust, convert, rename, and process your pictures and photos in 30+ image formats with 120+ filters and effects using this graphics software. It features 4 processing modes, per-channel filters, layers, more!.




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.






Ralpha Image Resizer is a lightweight and portable program that can perform image operations in batch mode, such as resizing and applying filters.

Not working properly( I tried to optimize 270 jpg images, it optimized first 30 and after program gave failure statuses. Just like Otimage. Not good. And again I recommend Imagine(from github) worked well, free. And Pichi, 7 days free, after 25 dollars as of now. both better