How to Fix a “Low Resolution” Warning Before Printing

You upload an image to a print shop, a photo lab or a print-on-demand site and see a warning: “low resolution”, “image quality may be poor” or a red or yellow icon. Here is what that means, and how to fix it before you pay for a print you won’t be happy with.

What the warning means

The service has divided your image’s pixel size by the print size and found the result is below its minimum, often somewhere around 150 pixels per inch. In plain terms, each pixel would be stretched over too much paper, so edges would look soft or blocky.

It is a warning, not a guess: if you print anyway, the result usually looks as blurry as the warning suggests. To see the exact numbers for your file and size, run it through the PrintCheck checker. It shows how many pixels are missing and how big you could print instead.

What doesn’t work

• Changing the DPI number in the file. Setting 72 to 300 adds no pixels and changes nothing in print. Why the DPI number is a myth.
• Simply resizing the image bigger. Ordinary resizing blends neighbouring pixels to fill gaps. The warning may go away, but the print will still look soft.
• Taking a screenshot. A screenshot is limited to your screen’s resolution and often smaller than the original.

Five fixes, from easiest to most work

1. Find the original file

This is the most common cause. Social media, messaging apps and email often shrink images. A photo sent over WhatsApp or saved from Instagram can be a fraction of its original size. Go back to the original: the camera’s memory card, your phone’s photo library, the cloud backup, or ask the person who took it to send the full-size file.

2. Re-export at a bigger size

If you designed the image in Canva, Photoshop, Illustrator or a similar app, check the export settings. Many apps export at the size the design was created at. Set up the design at the real print size from the start, for example 8 × 10 inches or A4, and choose the highest quality export.

3. Print smaller

Often the quickest fix is choosing a size the image can handle. Divide the pixel width by 300 to get the largest sharp width in inches. A 2000 pixel wide image prints well up to about 6.7 inches wide. Pixel chart for common sizes.

4. Use vector versions of logos and text

If the image contains a logo, text or simple graphics, rebuilding those parts as vectors (shapes rather than pixels) means they print perfectly sharp at any size. Ask the designer for an SVG, PDF or EPS version of the logo. For print-on-demand designs that are mostly text, recreating the design in a vector tool usually gives better results than any upscaler.

5. Upscale with AI

Modern AI upscalers can enlarge an image up to about 4× while adding believable detail, far better than ordinary resizing. They work best on illustrations, AI-generated art and clean photos, and less well on tiny faces, small text or heavily compressed images. When AI upscaling works and when it doesn’t.

Is the warning always right?

Mostly, but not always. Services use one minimum for every product, while large prints are seen from further away and can look fine at lower resolutions. A 150 PPI poster or canvas viewed from across a room can look sharp. For anything held close, such as photos, cards or mugs, take the warning seriously.

Quick checklist

1. Check the image’s real pixel size and how big you can print it.
2. Look for the original or a larger export.
3. If none exists, choose a smaller print size or upscale with AI.
4. Check the new file again before ordering.
5. For important or large orders, order one small test print first.