Keep original dimensions
Compression changes encoding, not width and height.
Private · Browser-based · No upload
Compress Image Online
Compress image files directly in your browser with JPG/WebP quality controls and lossless PNG optimization.
JPG · PNG · WebP
Choose imagesDrag or click to choose
Images 0
Right method for each format
JPG and WebP use quality control; PNG uses lossless OxiPNG optimization.
Batch compression
Compress several images, compare before and after sizes, then download individually or all at once.
How to use Compress Image Online
- 1
Add images to compress
Choose, drag or paste one or more JPG, PNG or WebP images.
- 2
Choose the compression method
Set JPG/WebP quality or choose the PNG OxiPNG optimization level. Pixel dimensions stay unchanged by default.
- 3
Compress and download
Compare original and output sizes, then download one result or a ZIP for multiple images.
About Compress Image Online
Compression keeps the original pixel dimensions by default. JPG and WebP use adjustable lossy quality; PNG uses lossless OxiPNG optimization.
Frequently asked questions
Does compression change image dimensions?
Not by default. ViewerPix keeps the original width and height and optimizes the encoding.
Why did my image not become smaller?
Some files are already efficiently encoded. If recompression would create a larger file, ViewerPix keeps the original instead.
Are my images uploaded to a server?
No. Supported image processing runs locally in your browser. Third-party decoder code may be loaded only when a format needs it, but your image itself stays on your device.
Private browser processing
ViewerPix processes supported images on your device. Your image files are not uploaded to a ViewerPix application server for this task.
Compression changes encoding, not pixel dimensions
ViewerPix keeps width and height unchanged by default. JPG and WebP use adjustable lossy quality; PNG uses lossless OxiPNG optimization instead of a fake quality slider.
Why can the output stay the same size?
Some images are already efficiently encoded. If recompressing would make a file larger, ViewerPix keeps the original file instead of replacing it with a worse result.