Check the actual application requirements first
Before creating a file, copy the exact pixel dimensions, maximum KB, and accepted formats from the institution's current official form instructions. Photo requirements vary; an image that has the right dimensions can still fail a passport or visa review if the lighting, face size or background does not meet the required rules.
Choose crop or fit
The Crop to exact size option fills the target width and height without stretching. Some edges may be removed. The Fit whole image option preserves every edge but can add blank margins. For signatures, fit is often safer, because cropping can cut the first or last letters.
Use the right file format
Use JPG if the application demands JPEG photos. Use PNG for clean signatures or when transparent background is explicitly accepted. WebP is compact, but many official application portals do not accept it. Select only formats allowed by the destination portal.
Understand KB size limits
A file size limit such as 50KB is a maximum, not an exact target. The browser can adjust JPEG or WebP quality, but it cannot guarantee every photo will fit the maximum at the same fixed dimensions. Check the result message before downloading.
Signature on paper
For a signature on plain white paper, use good lighting with no shadows or folds. The optional near-white transparency filter is a visual aid for PNG, not guaranteed background removal. Inspect thin strokes after processing and keep the original scan.