Improve Image Quality Online
Improving image quality online usually means increasing resolution, adding modest sharpness and exporting a cleaner file.
Start With Resolution
Small images often look poor because there are not enough pixels for the final use. Upscaling gives the image more room to display clearly.
Use 2x for a natural result, then adjust sharpness only if the image still looks soft.
Avoid Over-Editing
Too much sharpening can create halos around edges and make skin or product textures look unnatural.
The best result is usually the cleanest version that still looks believable.