JPEGmini!

ImageOptim is excellent for publishing images on the web (easily shrinks images “Saved for Web” in Photoshop). It's useful for making Mac and iPhone/iPad applications smaller (if you configure Xcode to allow better optimization). ImageOptim removes EXIF meta­data, such as GPS position and camera's serial number, so that you can publish images without exposing private information (but there's an option to keep the meta­data if you need it).

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 choosing the right parameters are the key factors of smaller files. Previewing the resulting image and the projected filesize will help the user choose the best settings. This kind of image optimization software is often called “Save for web”.

pngquant is a command-line utility and a library for lossy compression of PNG images.

With Image Optimizer you can losslessly optimize your PNG, JPEG and GIF files and thus save your bandwidth and your users' time! Kraken recompresses images with blazing speed and strips metadata with image quality intact.

The following utilities are part of this project:jpeg-archive: compress RAW and JPEG files in a folder utilizing all CPU cores.jpeg-recompress: compress JPEGs by re-encoding to the smallest JPEG quality while keeping perceived visual quality the same and by making sure huffman tables are optimized. This is a lossy operation, but the images are visually identical and it usually saves 30-70% of the size for JPEGs coming from a digital camera, particularly DSLRs.jpeg-compare: Compare two JPEG photos to judge how similar they are.jpeg-hash: Create a hash of an image that can be used to compare it to other images quickly. »

optimus.io offers lossless compression of images available with a WordPress plugin and via API. Benefits: - The file size will be reduced but the image quality remains the same- Bulk optimization- Conversion also to WebP available

Make your website faster and save bandwidth. TinyJPG compresses your JPEG images by 40-60%!

PictureBeaver is a WSH script for batch optimization PNG/JPEG/GIF images using optipng/jpegtran/gifsicle utilities.

WP Smush strips hidden, bulky information from your images, reducing the file size without losing quality. The faster your WordPress site loads, the more Google, Bing, Yahoo and other search engines will like it.

Photo Size Optimizer for Mac:

FILEminimizer Pictures from balesio compresses digital images and photos with file size reductions by up to 98%. For example, a JPEG photo with a size of 5 MB can be reduced to only 0.08 MB. The software features an innovative image optimization technology: the powerful compression of an image is achieved without any visible quality loss and during the whole compression process the respective native image file format is maintained, making a subsequent decompression irrelevant.

Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images. It handles JPGs, GIFs and PNGs.

The ultimate image optimization tool to compress your images in JPEG and PNG formats for sharing and posting on web pages.

iLoveIMG is an online service to work with images completely free and easy to use. Compress images, resize, crop, convert and much more!