Why Images Look Pixelated When Enlarged and What to Do

An image is a grid of tiny squares

Photos, screenshots, and most images online are made up of a grid of pixels—tiny squares, each with a single color. A 400 × 300 image has 400 columns and 300 rows of these squares, and that's it. When you zoom in too far, each pixel becomes a large, visible square: that's the pixelated (or jagged) effect.

The software enlarging the image can smooth the transitions by calculating in-between colors. The result looks less blocky, but blurrier. In either case, details that weren't in the original image don't appear.

Common causes

• Image too small for the intended use. A 200-pixel logo downloaded from a website and stretched to fit a banner.
• Heavy compression. Highly compressed JPG images develop blocks and blotches that look like pixelation, especially in areas of solid color.
• Repeated sharing through messaging apps. Each time you resend an image as a regular photo, it's recompressed and reduced a little more.
• A screenshot of a screenshot. Taking a screenshot of an image that's already been reduced, then enlarging it.
• Digital camera zoom. On many phones, zooming past the lens's optical range simply enlarges the pixels.

The right solution for logos and icons: vector images

Logos, icons, and simple illustrations are often available in vector formats (SVG, PDF, AI, EPS). A vector isn't made of pixels; it's made of shapes described mathematically, so you can enlarge it to any size without losing sharpness.

• Ask the company or designer for the logo as an SVG or vector PDF.
• If you have an SVG but need a regular image file (for an app or website that doesn't support SVG), create a PNG at the final size with SVG to PNG. That way, the image starts out large and sharp instead of being enlarged later.

What about photos?

1. Find the original version with more pixels. Photos received on WhatsApp as images are often reduced; ask the sender to share them as documents.
2. Use a smaller size. Reducing an image almost always improves its appearance because details are concentrated in less space. Resize image does this while preserving the aspect ratio.
3. Enlarge moderately and sharpen. If you have to enlarge an image, keep it modest (up to about 150% to 200%) and apply a light sharpening effect with Sharpen image. Too much sharpening creates halos and makes noise more noticeable.
4. AI upscalers generate plausible details and can look impressive on landscape photos. Since they make up information, don't use them for documents, signs, faces used for identification, or anything where accuracy matters.

How to prevent this in the future

• Always keep the originals and make smaller copies to share.
• Ask for high-resolution files at the start of a project (logos, product photos, artwork).
• Use PNG for screenshots, logos, and text; JPG compression can create artifacts along sharp edges.
• Use your phone's optical zoom lens (2x, 3x, 5x, depending on the model) instead of pinching to zoom beyond its range.

For teams and businesses, it's a good idea to keep a shared folder of high-resolution "official" files: the logo in SVG and large PNG formats, original product photos, and final artwork. That way, no one has to use an image downloaded from a website or captured in a screenshot—two of the most common sources of pixelated images in print materials.

How to check an image's actual size

Before using an image in a banner, on a large screen, or in print, check its pixel dimensions with View image size and details. For screens, a good rule of thumb is to use an image at least as wide in pixels as the space where it will appear (for example, 1920 pixels for a Full HD slide). For printing, see how much photo resolution you need for printing.

Frequently asked questions