Luban(鲁班)—Image compression with efficiency very close to WeChat Moments/可能是最接近微信朋友圈的图片压缩算法

Picture Selector Library for Android or 图片选择器

An android image compression library.

JavaScript image compressor.

High-performance image manipulation for web servers. Includes imageflow_server, imageflow_tool, and libimageflow

Free Lossless Image Format

TinyPNG client for Mac

🖼️ PNG/JPEG optimization app for macOS, Windows and Linux.

Insane(ly slow but wicked good) PNG image optimization

an image compression framework.（一个高保真、高压缩比的图片压缩框架）

Caesium is an image compression software that helps you store, send and share digital pictures, supporting JPG, PNG and WebP formats. You can quickly reduce the file size (and resolution, if you want) by preserving the overall quality of the image.

JPEG XL image format reference implementation

A Github Action that automatically compresses JPEGs, PNGs and WebPs in Pull Requests.

An Advanced Compress Image Library for Android / 高效、简洁的图片压缩工具库

An Azure Function solution to crawl through all of your image files in GitHub and losslessly compress them. This will make the file size go down, but leave the dimensions and quality untouched. Once it's done, ImgBot will open a pull request for you to review and merge. help@imgbot.net

Image compression in web browser

📸 Fast batch image resizer and rotator

The Arm ASTC Encoder, a compressor for the Adaptive Scalable Texture Compression data format.

CLI image optimization tool

A free and open source tool for optimizing images and vector graphics.