Start with the product template and print placement
Open the instructions for the exact product, variant, and decoration method before sizing the design. Note the placement dimensions, minimum and recommended image resolution, supported file formats, required color profile, and any safe areas. Do this again when the same design goes on a second placement or item. A chest print, all-over fabric panel, mug wrap, and poster use different artwork boundaries even if the listing shares one visual concept.
Use the provider’s current product template and keep its guide layer separate from production art. Make a copy for each placement so changes carry through deliberately. In the exported artwork confirm that guides, registration text, and dimensions are excluded unless the provider asks for them. Inspect the design in the product preview for seams, edges, and multi-panel alignment.
Worked example for a 12 × 16 inch placement
If the provider calls for 300 PPI across a 12 × 16 inch area, prepare at least 3,600 × 4,800 pixels for a file that fills it. A 2,400 × 3,200 pixel illustration fills that area at 200 PPI. It could instead print at 300 PPI over 8 × 10.67 inches if a smaller placement is acceptable. Ask which resolution and print size apply before increasing the canvas size or resampling.
| Target | Pixel width | Pixel height |
|---|---|---|
| 150 PPI | 1,800 | 2,400 |
| 200 PPI | 2,400 | 3,200 |
| 300 PPI | 3,600 | 4,800 |
These numbers are computed examples, not a specification for a named product. Measure the size at which the artwork actually prints. If it sits inside a much larger transparent canvas, check both the overall placement and the pixels occupied by the artwork. Verify that the provider has not scaled it unexpectedly in the mockup.
Check transparency and color before uploading
If the design should show the garment or substrate through clear areas, use a supported format that retains transparency and inspect the export on both light and dark backgrounds. JPEG has no transparency. Review edges for a faint background or halo left after removing a solid color. Follow the provider’s instructions for color profiles rather than switching modes automatically. Preview colors are useful for alignment and layout, while actual materials and print processes can affect the appearance.
Order or inspect a sample when a material, fine line, or color is important to the listing. Compare it with the intended product dimensions and zoom in on small details. For provider examples, see Printful’s print file preparation guidance and then check the product’s own instructions.
Common export mistakes
Exporting a scaled-up preview produces more pixels without recovering lost detail. Reusing a square file on a tall panel can cut off lettering. An export that looked transparent in the editor may have flattened to white. Save separate production versions with the variant name, placement, and revision so you can replace the right file later.
Keep the submitted production file beside the original design so you can identify what was actually uploaded for each product.
Frequently asked questions
Can one file work on several products?
Only when its dimensions, placement, format, and layout meet each product’s requirements. Check the preview for each variant.
Should every product use 300 PPI?
Use the published rule for that product and decoration method. The sample calculation uses 300 PPI to demonstrate the arithmetic.
How should I export a transparent background?
Choose a supported format with transparency, such as PNG where allowed, and inspect the exported file on contrasting backgrounds.
Does the DPI checker replace the product preview?
Use it to measure image density. Placement, garment seams, and template boundaries need checking in the provider’s preview and sample.