To check a design at real print size, work out how many inches wide it will print, then view or print it at exactly that size and look at it from the distances people will see it, on every garment colour you plan to sell. A short check like this catches the small text, soft edges and colour clashes that a zoomed-in screen hides.
On a monitor a design is usually either shrunk to fit the window or zoomed far in, and neither view tells you how it will look across a chest. A problem found after the first order costs a refund, a reprint or a poor review. Found before listing, it costs a few minutes. The check matters most when you use AI art, bought art or a file someone else made, because nobody set its print size on purpose.
Step 1: work out the real print size
Print size comes from two numbers: the file's pixels and the DPI it prints at. Divide the pixel width by the DPI and you get inches. A file 3,600 pixels wide prints 12 inches wide at 300 DPI. A 1,200-pixel file stretched to the same 12 inches drops to 100 DPI, and its edges will look soft on fabric.
Print providers set their own targets. One provider recommends 300 DPI for JPEG and PNG files, and another accepts 150 to 300 DPI depending on the product. The second one also states the rule this whole check rests on: "Make sure the file is sized to match the actual print dimensions to ensure DPI is calculated correctly." A file that is 300 DPI at 4 inches is not 300 DPI at 12. Our explainer on what DPI means for print files goes deeper.
Write down the width you actually intend to print. A full-front design, a left-chest logo and a back print each have their own size, so check each one at its own.
Step 2: see it at true size, not at 100 percent zoom
Zooming to 100 percent in an image editor shows you every pixel, but screens pack pixels at different densities, so 100 percent is not the size the print will be. A 3,600-pixel design at 100 percent spills across a laptop screen, while the same file on a phone looks like a postage stamp.
The reliable method is paper:
Export a copy of the design at the width you plan to print.
Print it with scaling set to 100 percent or actual size, never fit to page. Tile it across sheets if your printer is small.
Measure the printout with a ruler to confirm the size.
Tape it to a shirt, or hold it against your chest in a mirror.
Now you see what a buyer will see: whether the design is too small on the body, too wide for the shoulders, or crowding the collar.
Step 3: look at it from three distances
People meet your design at three distances, and it has to work at all of them.
Arm's length. The wearer looking down, or a friend across a table. Fine detail and small type should still be readable here.
A few steps away. How strangers see the shirt. The main words and shapes should read at a glance.
Phone thumbnail. How shoppers first meet the listing in search. Etsy asks sellers to position the image so "your subject is clear in all 3 views used across Etsy", and a design that turns into a blob at that size loses the click.
Thin lines and small secondary text fail first. Our guide to thin lines and small text that survive printing lists the usual suspects, and the one on designing so your art reads in an Etsy thumbnail covers the search view.
Step 4: check every garment colour you sell
A design stops being one design once it meets ten shirt colours. Dark outlines vanish on black, pale lettering vanishes on white, and mid-tones can melt into heather. DTF copes with fabric colour by printing a white ink layer on the film, which is why one transfer can go on any colour, but it cannot make a navy word readable on a navy shirt.
Garment-dyed blanks add another variable. The Comfort Colors 1717 spec sheet warns: "Please allow for slight color variation in production and washing." Judge those colours with a little tolerance. If a design only works on half your colours, it usually needs a light and a dark version, or a shorter colour list.
Check the size range as well. One provider notes that designs "are not scaled up for sizes larger than L", so a print sized for an L covers less of a 3XL. If you sell plus sizes, picture the design on the largest one too.
A pre-listing checklist
| Check | How to do it | What it catches |
|---|---|---|
| Effective DPI | Pixel width divided by print width in inches | Soft, blocky or pixelated edges |
| Paper proof | Print at actual size and tape it to a shirt | Text too small, design too big or too small for the body |
| Distance view | Look from arm's length and from a few steps away | Thin lines and small words that blur together |
| Colour run | Mockup on every garment colour you offer | Parts that vanish on dark, light or heather fabric |
| Transparency | Open the PNG over a black and over a white background | Leftover white boxes, halos and stray pixels |
| Thumbnail | Shrink the main mockup to phone size | A design that reads as a blob in search |
The transparency check matters because a background that is not truly transparent gets printed. JPEG does not support transparency, so transparent areas can print as white. Keep print files as PNG.
How Alomations helps with this check
Alomations takes the guesswork out of step 1. Every design comes back print-ready at 12 inches and 300 DPI, which is 3,600 pixels on the long side, as a transparent PNG with an SVG alongside. It also makes light and dark versions from one design, and tone rules per garment colour decide which version each colour gets, automatically, with the option to override.
For steps 3 and 4, Mockup Preview on paid plans shows the design on every colour and every side before the run, and on your own mockup photos you can change the shirt colour live. When the preview shows a problem, the Design Editor (also on paid plans) keeps the fixes in one place: outlines for lettering that disappears on dark fabric, recolouring of the whole palette or one element, fit to canvas, and enlarging a photo that is short of pixels. The features page lists the rest.
Frequently asked questions
What DPI does a t-shirt print need?
It depends on the provider and the product. One provider accepts 150 to 300 DPI depending on the product, another recommends 300 DPI for PNG files, and both measure it at the real print size. Check your own provider's file guide.
Is viewing the design at 100 percent zoom enough?
No. 100 percent zoom shows pixels, not inches, and screens differ in pixel density. A paper proof printed at actual size is the reliable view.
Why does my design look smaller on big sizes?
Some providers do not enlarge the design for bigger sizes. One provider, for example, does not scale designs up for sizes above L, so the same print covers less of a 3XL than of an L.
Do I need to check every colour?
Check every colour family at least once per design: white, black, heather and any garment-dyed shades. If one colour in a family fails, check its neighbours before you list them.
Try the free plan, and your next listing run will hand you print-ready 12-inch files to put through this check.
