Reduce Your File Size. If you need a small file size decrease the values. The other solution is to resize your photo decreasing the number of pixels it takes to store the image which reduces its file size proportionally.
Under Preserve fidelity when saving this document do either of the following. One of them is compressing the image. How to reduce PDF size.
Under Image Size and Quality do the following.
How to Compress a PDF Online Free. Press COMPRESS. Note that if you discard editing data you wont be able to restore the image after you edit it. Choose one and click on Convert.