Inches, centimetres and pixels at 150, 200 or 300 DPI, checked against the real print area of each placement.
Print areas are the sizes most print-on-demand partners publish for these products. Check your own partner’s template before you export — a few run an inch smaller.
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Print providers publish their print areas in inches and want files in pixels. This converts between them and shows whether your design actually fits the placement.
It runs in your browser. Nothing is uploaded.
Pixels = inches × DPI. That is the whole calculation, and it is the one people get wrong by exporting at a fixed pixel size regardless of how large the design prints.
The diagram draws your design inside the selected print area to scale, so an overflow is visible rather than something you discover after the first order.
Once you have the pixel dimensions, run the finished file through the print file checker — it reports the true DPI at your print size and whether the transparency survived the export. Which density to multiply by is not the 300 everyone repeats: DPI, bleed, and the 300 DPI myth sets out what direct-to-garment can actually resolve, and when bleed matters at all.
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