In this article: The Best Online Image Optimizers That Let You Compress JPG, PNG, and GIF Files Without Quality Loss.
Online image optimizer tools help you compress images without losing quality. And to give an idea of how much the image can be compressed.
The best online image optimizers without quality loss tested & compared
4 Free Online Image Compressors with No Quality Loss
1. Geek Free Image Compression
Geek Free Image Compression reduces the file size of JPEG and PNG images. Every uploaded image is analyzed to apply the best possible JPEG and PNG encoding. Easily perform tiny PNG/JPEG compression on JPEG and PNG image formats, allowing you to batch upload up to 20 images at once. Each file can be up to 5 MB in size.
Geek Free Online Image Compression Online Image Compressor uses the optimal compression algorithm to achieve image compression that is superior to other software, and it is easy and quick to reduce the size of image files. 
https://www.geekersoft.cn/image-compress-online.html After the image is compressed, it can be downloaded to the computer.
2. Compress Jpegs
Compressjpeg helps to compress image size. You can select up to 20 JPG or JPEG, PNG, PDF, GIF, SVG images from your device. Drag and drop functionality. Download individual or all images with one click.
3.JPEG.Io
JPEG.io can convert all types of images to any format. It is the best online image optimization tool. You can drag and drop files onto their website. It is then optimized using advanced JPEG optimization techniques.
4. Optimization tools
Optimizilla online image optimizer helps reduce JPEG and PNG images to the smallest possible size. Manage with high-quality images. And upload up to 20 pictures.
Finally, the best online image optimizer with no quality loss tools for Geek Free Image Compress PNG, GIF, SVG images with the highest compression rates.