Designing a T-Shirt in Illustrator That Is Actually Ready to Print

Plenty of illustrators can design a sharp piece in Adobe Illustrator but stall out on the print-ready file, since a design that looks perfect on screen does not always translate to fabric. The differences are small but they matter: color mode, artboard size, and how the file is exported. Here is what actually needs to be true before a design goes from Illustrator to a real shirt.

File size and resolution that actually print sharp

Build the artboard at the actual print size, not a small web-sized canvas scaled up. A center-chest design should be built at roughly 10 to 12 inches wide at 300 DPI if working in raster layers, or as vector shapes that scale cleanly at any size. Vector art built in Illustrator has the advantage here: it stays sharp at any print dimension since there is no pixel resolution to run out of.

Color mode: RGB versus CMYK for apparel print

Illustrator defaults to RGB for screen work, but garment printing methods read color closer to CMYK. Colors that look vivid in RGB, especially bright greens and some purples, can shift noticeably once printed. Preview the file in CMYK before finalizing to catch the biggest color shifts ahead of time.

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Template dimensions by placement

Placement	Typical width	Notes
Left chest	3-4 inches	Keep detail simple, small print area
Full center chest	10-12 inches	Most detailed illustrations fit here
Full back	12-14 inches	Best for painterly or highly detailed pieces
Sleeve	2-3 inches	Small mark, date, or wordmark only

Common Illustrator mistakes that fail print

• Leaving hidden or unused layers in the exported file that confuse the print setup
• Exporting at low resolution because a raster element was scaled up after placement
• Using pure black (0,0,0,100 in CMYK) instead of a rich black mix, which can print flat
• Forgetting to flatten transparency, which sometimes shifts colors on export

From finished file to a live product

Once the file is print-ready, it uploads the same way at shops.beargrips.com/for/artist-illustrator whether it started in Illustrator, Procreate, or Photoshop. See why a separate mockup step is not necessary once the file is uploaded, since real product photos generate automatically.

Frequently Asked Questions

Do I need to build a separate file for every product?

One well-built master file usually works across tees, hoodies, and crewnecks. Hats often need a simplified version due to the smaller print area.

Is vector art required, or can I use a raster illustration?

Raster art works fine as long as it is built or exported at a high enough resolution for the intended print size.

What file format should I upload?

A high-resolution PNG with a transparent background is the standard format for upload.

Does font choice matter for a wordmark design?

Yes, thin fonts can lose detail in print. Slightly bolder weights hold up better at smaller sizes.