Create email-friendly images, resize in batches, convert formats, and compress using high-quality filters. Integrated in Windows Explorer, it offers high-res settings, watermarking, a profiles library, PDF creation, and supports devices like iPad and iPhone.

Experimental, fast Web PNG/JPG optimizer which offer lossless, visually lossless or lossy compression. it performs image reductions over iterations thanks to recursive multi-processing and multithreading systems.

Minuimus is a file optimizer utility script: You point it at a file, and it makes the file smaller without compromising the file contents.

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

C++ file optimizer. It supports PNG, JPEG, GZIP, and ZIP files.

From developers to developers: a cross-platform tool for losslessly image compression.

An Android app to compress images and videos through ffmpeg before sharing them.

Free and powerful online image toolkit. Can convert your image format, resize image size, generate QR code, crop image, etc.

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.

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.

tinyPNG.App provides a GUI front end for tinyPNG for your local computer so you can optimize images using the tinyPNG API service. Available on Windows, macOS & Linux.

TruePNG is one of the most advanced PNG optimizers available. It does the most exhaustive checks for reductions, that lets it to optimize further, even if it uses a less efficient compression algorithm than others tools.