Why Is My QR Code Blurry?
A blurred or blurry QR code — sometimes described as a "blur barcode" problem — is almost always caused by starting from a low-resolution image, a screenshot or small PNG, and scaling it up, which blurs the hard edges QR codes depend on. The fix is regenerating from the source as an SVG or a properly sized PNG rather than stretching an existing small file. Camera focus at scan time and print quality can also cause blur, but they're less common than a bad source file.
Start with the source file. If a QR code looks soft, pixelated, or has fuzzy edges around the black modules, the file was very likely created small and then resized up — a 200x200 pixel PNG stretched to fill a poster, for example. Raster images don't gain detail when enlarged; they just get blockier. QR codes are especially sensitive to this because their scannability depends on sharp, high-contrast edges between modules, and blur softens exactly those edges. The fix isn't to sharpen the existing file — it's to go back to the source and export a new one at the correct size, ideally as an SVG, which scales to any dimension with zero quality loss.
If the blur only shows up when scanning, not when looking at the image itself, the problem usually isn't the code at all — it's the phone's camera struggling to focus, most often because it's too close to the code. Backing the phone away a few inches and letting it refocus resolves this in the vast majority of cases. This is a scan-time issue, not a file problem, so no amount of regenerating or reprinting the code will fix it.
Print quality is the third common cause, and it shows up specifically on physical output rather than on-screen. A low-DPI printer, worn-out toner, or a design program that flattened a vector file into a low-resolution raster during export can all introduce blur that wasn't present in the original digital file. Comparing the printed code against the source file on a screen usually makes this obvious — if the screen version looks crisp and the print doesn't, the problem happened during export or printing, not in the code's design.
In practice, these three causes rank in that order of likelihood: a small source image stretched too large, a scanning phone that needs to refocus, and print-stage quality loss. Ruling out the first with an SVG export solves the majority of blur complaints before they even reach the printer.
One more source-file mistake worth checking for: pasting a QR code into a word processor or slide deck and then dragging its corner handle to resize it can silently re-rasterize the image at a lower effective resolution than the original file, even when the original was itself high-quality. If a code looks fine as a standalone file but blurs once placed into a document or presentation, exporting straight to the final size needed, rather than resizing after the fact inside another program, usually resolves it.