A day ago I was helping my sister in filling up online form for Navodaya Selection Test for admission to Class VI. Everything was as usual except for file uploads. They have specified the file sizes in the brochures but have not specified the dimensions. And what was more disappointing was that they don't have on-page file validation system meaning there is no way to know whether you have selected the correct file and correct format before uploading or saving. As a result I had to use trial and error methods using the save option to guess the correct file format. No pun intended, but even a javascript newbie with little knowledge of php can implement this feature.

The point is that adjusting just the file sizes is not enough. You have to adjust the dimensions and resolutions as well. After three attempts, the following formats worked(I am sharing this thinking if this would save somebody's time):

Profile photo

Parent/Candidate signature

Certificate

It is to be noted the above specifications are not absolute, meaning there could be other variations as well which could work. But the above ones are tested and worked for me. That's it. Last date of online form submission is extended till 15th of December. For any other related queries, you may drop a comment below. All the best Navodaya aspirants!!