Prepare a design for print

Print-on-demand editors size a design by its pixels. Writing "300 DPI" into a small file doesn't make it print bigger or sharper: a 1024 px image has enough pixels for about 8.7 cm at 300 DPI. These tools give the design the pixels its print size needs and write the DPI into the file.

Which tool

Tool	What it does	Price
DPI Fixer	Trims the empty margins, resizes the art to the exact pixels of the print size and writes the DPI into a PNG.	30 credits
DPI Fixer Ultimate	A 4× AI upscale first, then DPI Fixer. For designs that are small or damaged: blurry edges, JPEG blocks.	80 credits
4× Upscaler	Only the 4× AI upscale, faithful to colours and texture.	50 credits

Start with DPI Fixer: it's right for most designs. Use Ultimate when the original is small for the print size or visibly damaged.

Step by step

1. Open DPI Fixer (or DPI Fixer Ultimate) and upload the design in "Image": PNG, JPG or WebP. Transparency is kept.
2. In "Preset", pick the product it will be printed on. To type a size yourself, pick "custom" and fill in "Custom width mm", "Custom height mm" or both.
3. "DPI" starts at 300, the print standard. Change it only if your print shop asks for another value.
4. Leave "Trim" on "auto" to crop the empty margins first, so the size applies to the art. "off" keeps the whole canvas.
5. Check the cost on "Run" and start it. You get a PNG with exactly the pixels that size needs and the DPI written in.

The art keeps its proportions: it fills the width or the height of the print area, whichever it reaches first.

Preset sizes

Preset	Print area
tshirt-front	300 × 400 mm
tshirt-oversize-front	300 × 450 mm
tshirt-women-front	250 × 340 mm
hoodie-front	270 × 270 mm
tshirt-kids-front	210 × 300 mm
baby-bodysuit	155 × 185 mm
mug-11oz-wrap	212 × 91 mm
bottle-wrap	190 × 90 mm
tote-bag	285 × 315 mm
apron	270 × 390 mm
poster-a4, poster-a3, poster-a2	210 × 297, 297 × 420, 420 × 594 mm
poster-40x60	400 × 600 mm

To remove the background first, see Remove backgrounds.