What is image resolution?
Image resolution is the number of pixels an image contains, written as width by height, such as 1920 by 1080. More pixels mean more detail and a sharper picture at larger sizes. Resolution is separate from file size and from DPI, which only matters for printing.
How resolution affects sharpness
A low-resolution image looks fine small but turns blocky when enlarged, because there are not enough pixels to fill the space. A high-resolution image holds detail even when shown big or cropped in.
Increasing resolution
You cannot invent detail that was never captured, but AI upscaling reconstructs extra pixels intelligently, which makes a small image usable at a larger size. That is different from simply stretching it, which only makes the blur bigger.
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Frequently Asked Questions
How do I increase an image's resolution?
Use an AI upscaler. It adds new pixels based on the surrounding detail, so the larger image stays sharp instead of turning blurry.
Is resolution the same as file size?
No. Resolution is the pixel count; file size is how many bytes the image takes up. Compression changes file size without changing resolution.