DPI stands for dots per inch — literally how many printed dots fit into one inch of paper. It sounds technical, but the practical effect is simple: more dots per inch means finer detail and sharper edges, which matters a lot at small sizes like labels and stickers.
Why 72 DPI looks fine on screen but bad on paper
Screens display images at a much lower effective resolution than print requires — a design that looks crisp on a monitor at 72 DPI can look visibly blocky or blurry once printed, because paper reveals detail a screen simply doesn't need to show.
Why 300 is the standard for small print
At 300 DPI, printed text and fine lines (like a barcode or small font) stay sharp even when viewed up close, which is exactly how people interact with a label — a few inches from their eyes, not across a room. Below that, edges start to look slightly soft or pixelated on close inspection.
What actually breaks if resolution is too low
Small text gets blurry edges, barcodes can become unreadable to scanners, and fine lines in a logo may disappear or merge together. The problems are most visible on exactly the kind of detail small labels tend to rely on.
What to actually check before printing
Export your design at 300 DPI (or let your design tool handle this automatically) rather than exporting a smaller web-sized image and scaling it up afterward — scaling up after export doesn't add real detail, it just stretches the existing pixels and makes blur worse, not better.