Why your printed design looks blurry

The frustrating part is that the screen never warned you. A monitor shows about 100 pixels per inch and a phone hides the rest, so a 1080 px image looks perfect at any zoom until it meets 300 dots per inch of ink. This page is the diagnosis and the three repairs, in the order that saves the most time.

See it at print scale#

The close-up below is a 30 mm square of a poster as the press would see it. Switch the resolution to 72 dpi, which is what a design made at screen size amounts to, and watch the type and the small print go soft. That is what came back from the printer.

The one-minute check#

1. 1Find the pixel size of the design (in Voidcanvas, Image, Image size…, or the status bar). Write down the width, for example 1080.
2. 2Find the printed width in inches. A4 is 8.27 in wide, A3 is 11.7 in, A5 is 5.83 in, a US letter is 8.5 in. Divide millimetres by 25.4 if you only have those.
3. 3Divide pixels by inches. 1080 ÷ 11.7 = 92. That is the effective resolution in pixels per inch.
4. 4Read the result: 300 or more prints sharp at reading distance. 150 to 300 is fine for a poster on a wall. Under 150 prints soft, and under 100 prints visibly blurry with jagged text.
5. 5Do the same for the biggest photo in the design: its pixel width divided by the width it covers on paper. A 1200 px photo across an A4 page is 145 ppi; the same photo across a quarter of the page is 580 ppi and perfectly fine.

Cause 1: a photo enlarged past its pixels#

This is the most common one. The design itself was set up correctly at 300 dpi, but a photo saved from the web, a WhatsApp forward or a screenshot was dragged in and scaled up to fill the space. Enlarging invents pixels by blending neighbours; it never adds detail. Everything else on the page is crisp and the photo is mush, which is the giveaway.

• Fix: get the original. Ask for the photo as it came off the camera or phone. A modern phone photo is 3000 to 4000 px wide and covers an A4 page at 300 dpi with room to spare. A WhatsApp forward has been shrunk to about 1200 px; ask for it sent as a document instead.
• Fix: use less of it. If no better file exists, place the photo smaller so its pixels are dense enough, and let colour or type carry the rest of the page.
• Fix: make it a treatment. A coarse halftone, a duotone or a heavy crop turns low resolution into a style. Nobody asks whether a halftone was sharp.
• Does not fix it: upscaling. Enlarging in software, including with AI, smooths the softness and can invent detail that was never there. It can rescue a small shortfall for a poster read from a distance; it cannot make a 600 px web image into a flyer photo.

Cause 2: the document was set up at screen size#

The design was made as a 1080 × 1350 social post, or a 1920 × 1080 slide, and then sent to print as an A4 flyer. Here everything is soft, text included, because the whole file has a quarter of the pixels the page needs. This also happens when a "72 dpi" document is set to the right size in inches but the pixel count was never raised.

• Fix: rebuild at the print size. Start a new document at the print preset (A4 flyer is 2480 × 3508 px, A5 is 1748 × 2480, the 18 × 24 in poster is 5400 × 7200) and bring the layers across. Text and shapes drawn in the application are redrawn sharp at any size, so only the photos need attention, and see cause 1 for those.
• Do not scale the finished design up. Scaling a flat export enlarges every pixel; scaling the layered design keeps the type sharp but not the photos. Rebuilding sounds slower and is faster.
• Check the dpi note is not fooling you. The dpi stored in a file is a label, not detail. A 1080 px file at 300 dpi prints at 3.6 inches wide, sharp. The same file forced to A4 is 92 dpi. Only the pixels are real; Image resolution explained covers this properly.

Cause 3: the export lost it#

The document and photos were fine and the export threw the quality away: a JPG at low quality, a PNG exported at half size, a screenshot of the design, or a PDF made by a tool that downsampled the images. Type with soft, dirty edges and blocky patches in flat colour are the signs; blurry photos alone are not.

• Fix: export at 1× or larger, as PNG or PDF. JPG compression is designed for photos and eats sharp edges first. For anything with type, PNG or a PDF at final size.
• Fix: never send a screenshot or a phone photo of the design. Both are resampled to the screen. Work from the source file.
• Fix: check the PDF page size. A PDF that opens at the wrong physical size will be scaled by the printer, and scaling up softens it. The page should equal the trim size plus bleed.

How Voidcanvas handles this#

• Image size… (Ctrl+Alt+I) shows the design's pixel size, roughly how many MB each layer takes, and what it prints at in centimetres at the Resolution you enter. Type 300 and read the print size; if it is smaller than the paper, you have cause 2.
• The print presets (A4 flyer, A5 flyer, Poster 18 × 24 in, Business card) are at 300 dpi, and a Custom size takes up to 8000 px a side.
• Photos over 4096 px on their longest side are scaled to 4096 when imported. That is enough for A4 at 300 dpi and A3 at about 248 dpi. For a photo that has to fill A2 or larger at full resolution, split it or accept 150 dpi, which is normal for posters read from a distance.
• Text and shapes are redrawn at export size, so a 2× or 3× export of type is crisp; photos are resampled and cannot gain detail.
• Export as… (Ctrl+E) offers PNG, JPG, WebP and PDF at 0.5×, 1×, 2× and 3×. For print, PDF at 1× from a print-size document, or PNG at 1×.

Before you send it again#

• Pixel width ÷ printed inches is 300 or more (150 for a poster on a wall).
• Every photo checked at 100 per cent; none enlarged past about 120 per cent.
• The document was built at the print size, not scaled up from a screen size.
• Exported as PDF or PNG at 1× or larger; no JPG for anything with type.
• The PDF page size equals trim plus bleed, and the printer knows the file is RGB.

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