> For the complete documentation index, see [llms.txt](https://beyondcompare.gitbook.io/project/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://beyondcompare.gitbook.io/project/other/how-to-compare-versions-of-images.md).

# How to compare images

Beyond Compare can open image files:

![Differences in red: extra salt and a missing Morton trademark](/files/-LXUnDopMOEaXvVAdL5Z)

Caveat: If the images are different sizes Beyond Compare will not stretch or resize them for you.  It is meant as a pixel comparison, so resizing wouldn't really make sense anyway.  

### To get started: 

Drag two images into Beyond Compare.  If the filenames end in .jpg, .gif, .tiff, or similar the software will detect the file extension and open them in a Picture Compare session.

The first two controls you should start with are (1) press the Tol (tolerance) button and then play with the tolerance slider.

(2) Flip rapidly between Image A and Image B by hitting the F8 key in Windows or with your mouse: ![](https://firebasestorage.googleapis.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LXUX-uoaZJ8T4qyEc-x%2Fuploads%2Fns2FnYuj1dVnwVOZv0sb%2Ffile.png?alt=media) and ![](https://firebasestorage.googleapis.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LXUX-uoaZJ8T4qyEc-x%2Fuploads%2FQ4mmpzOrmOlwgOc6ygQ0%2Ffile.png?alt=media)