> For the complete documentation index, see [llms.txt](https://imageoptimizer-docs.secomapp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://imageoptimizer-docs.secomapp.com/frequently-asked-questions/will-the-app-compress-the-images-which-were-already-compressed.md).

# Will the app compress the images which were already compressed?

No. Smart Image Optimizer app detects new images and compresses the new images. Therefore, the images which were previously optimized **are excluded from the optimization** process and image counts. 

To know whether your images have been optimized or not, please go to [History](/others/how-to-check-the-image-size-after-optimization.md).