Print-ready files for t-shirts and merch: what to ask your designer for

Start with the print method

The way a product is printed decides what the file must look like, so find out the method before the designer starts. The common methods are:

• Screen printing: ink is pushed through a stencil, one color at a time. It is cost-effective for larger runs but works best with a limited number of solid colors. Gradients and photos need special preparation.
• Direct-to-garment (DTG): the design is printed like a photo onto fabric. It handles many colors and is popular with print-on-demand services, but very fine details and light colors on dark fabric can look softer.
• Embroidery: the design is stitched. Small text and thin lines must be simplified, and the file must be converted into a stitch file by a digitizer.
• Sublimation and full-print products: used for mugs, all-over prints and polyester items. The design must match a specific template.

Tell your designer the method, the product and the printer's file requirements. Most printers publish a short guide; sending it at the start avoids rework.

Vector or high-resolution raster

For logos, text and bold illustrations, a vector file is ideal because it stays sharp at any size. For painted or photographic artwork, a raster file is fine as long as it is created at the full print size and at roughly 300 pixels per inch. Enlarging a small image afterwards does not add detail; it only makes the blur bigger. If you only have a low-quality version of an existing design, a designer can redraw it through vector tracing.

Colors and backgrounds

Ask for files with transparent backgrounds unless the design is meant to be a solid block. Think about the shirt or product color too: a dark design on a dark shirt disappears, and white ink on light fabric looks faint. Many designers prepare two versions, one for light products and one for dark. For screen printing, agree on the number of ink colors and ask for exact color references, because each extra color can add cost.

Size and placement

Ask for the design at the real print size, for example a chest print, a full front print or a small pocket logo. Text that looks fine on a large poster may be unreadable on a pocket print. A good designer will show the design on a mockup of the actual product at the right scale, so you can judge readability and balance before anything is printed.

Details that often go wrong

• Lines thinner than the printer's minimum, which break up or vanish.
• Soft shadows and semi-transparent effects, which some methods cannot print.
• Fonts that are not licensed for commercial products.
• Stray white boxes around designs that were meant to be transparent.
• Text too close to seams, handles or the edge of the print area.

Rights to sell

If you plan to sell the products, you need the right to use every element in the design commercially. Avoid famous characters, logos, brand names and lyrics unless you hold a license. Ask the designer to confirm that the artwork is original or properly licensed, and that fonts allow use on products for sale. Print-on-demand platforms can remove listings that break these rules.

Checklist before printing

• Print method and printer requirements shared with the designer.
• Vector file, or raster at full size and about 300 pixels per inch.
• Transparent background and versions for light and dark products.
• Ink colors agreed, with color references for screen printing.
• Mockup at the correct size and placement approved.
• Fonts and artwork licensed for commercial use.
• A sample ordered and checked before a large run.

Keep the master files and font information in one folder so reorders and new products are easy. Our t-shirt and merchandise design guide covers how to compare designers, and our logo file formats article explains vector and raster files in more depth.