This app can be used to automatically stitch multiple overlapping photos together. You can then crop the output image to your preferred size. Final stitched image can also be rotated or flipped.
The app automatically finds overlapping parts in your input images, performs perspective transformations, and blends the images smoothly together.
JPEG, PNG, and TIFF image formats should be used as input.
To achieve good results, you should make sure that your camera is leveled when moving. Additionally, try to get at least about one third overlap between pictures. You can look for something distinctive in the surrounding to help you find good overlap of each photo.
When shooting the photos try to keep the focus and exposure settings same between each photo.
You can also enable "Scan mode" in settings, which is more suitable for stitching scanned documents with only affine transformations.