Assalam alaikum. Not sure if this is referring to uploading an avatar image or just pictures in general. I use a PC and just uploaded an image but the pixels were too large. If you have a PC with Windows, I just right-clicked on the file name and then clicked Edit in the menu. A bitmap editor tool opened and I just clicked the Image menu if I recall and then the Stretch/Skew option. I just kept lowering the percentage and saving the new image and checking it until it met the requirements and then uploaded it. If you see a file extension of .jpg or .gif for example you may be able to change it to .bmp and open it and the editor tool will come up. Hope that helps.