How to Prepare Your Artwork for Screen Printing (File Format Guide)

The difference between a crisp, professional screen print and a fuzzy, disappointing one is often decided long before the ink hits the shirt, it is decided in the artwork file. Great screen printing starts with clean, print-ready art. At Arnold Prints® in Westlake, FL, we prep thousands of files a year for our M&R automatic presses, and the same handful of issues trip people up again and again. This guide walks you through exactly how to prepare your artwork so your design prints sharp, bold, and exactly how you imagined it.

Best File Types for Screen Printing

Screen printing loves clean edges, and clean edges come from the right kind of file. Here is what we prefer, in order:

• Vector files (best): .AI, .EPS, or a vector PDF. Vector art is built from mathematical paths, so it can scale from a left-chest logo to a full back print without losing a single bit of sharpness. This is the gold standard.
• High-resolution raster (acceptable): layered .PSD, .TIFF, or a high-res .PNG with a transparent background. These can work well as long as the resolution is high enough at the final print size.
• Avoid: low-res JPEGs pulled from a website or social media, screenshots, and tiny logos blown up large. These pixelate and print blurry.

Only have a small or blurry logo? Do not print it as-is. Send it to us and we can often recreate or clean it up. You can also read why AI-generated and low-res images cost you money before you commit a file to press.

Resolution and Sizing: The 300 DPI Rule

If you are sending raster art, resolution is everything. The magic number is 300 DPI at the actual print size. That means if your design will print 12 inches wide across the back of a shirt, the image needs to be 300 DPI at 12 inches wide, not 300 DPI at 2 inches and then stretched. Stretching a small image to fit a large print introduces blur and jagged edges that no press can fix. Always build or export your art at full print dimensions.

Color Setup and Spot Colors

Screen printing applies one color per screen, so how you set up color matters a lot. Whenever possible, use solid spot colors rather than blends or gradients. Spot colors are cleaner, more predictable, and often more affordable because each color is its own screen. If you have a brand color, give us the Pantone (PMS) number so we can match it precisely. Keep your layers organized and named, and separate each color onto its own layer where you can. Complex full-color photographic art is possible, but it moves into color separation and may print better as a DTF transfer. Our guide on screen printing vs heat transfer explains when to switch.

A Note on Underbase for Dark Shirts

Printing on dark garments usually requires a white underbase layer so the top colors stay bright. You do not need to build this yourself, our art team handles it, but knowing it exists helps you understand why dark-shirt jobs sometimes have an extra screen.

Text and Fine Detail

Tiny type and hairline strokes are where prints most often fall apart on press. Follow these rules to keep small details clean:

• Keep text at 8 to 10 pt or larger. Anything smaller can fill in or break up, especially on textured fabrics.
• Avoid ultra-thin strokes and outlines. Very fine lines can clog the screen or disappear. Thicken them slightly for reliable printing.
• Convert fonts to outlines/curves. This prevents your text from shifting to a default font if we do not have the exact typeface installed.
• Mind the trap. Leave a little overlap between adjacent colors so small registration shifts do not leave white gaps.

Prep Checklist Before You Hit Send

1. Art is vector, or high-res raster at 300 DPI at final print size.
2. Background is transparent (or clearly marked for removal).
3. Colors are set as spot colors with Pantone numbers where possible.
4. Fonts are converted to outlines.
5. Text is 8 to 10 pt minimum; thin strokes thickened.
6. File is sized to the actual dimensions you want printed.

Not confident about your file? That is exactly what our in-house art department is for. Our custom graphic design services can vectorize a logo, separate colors, and get your artwork press-ready.

Frequently Asked Questions

What is the best file format for screen printing?

A vector file (.AI, .EPS, or vector PDF) is best because it scales to any size without losing quality. If you only have raster art, send it at 300 DPI at the final print size.

Can you print directly from a JPEG or PNG?

Sometimes, if it is high resolution with clean edges. But low-res JPEGs and small PNGs will print blurry. When in doubt, send it to us and we will tell you honestly whether it is print-ready.

How many colors can I have in a screen printed design?

Each color is its own screen, so more colors means more setup. Simple 1 to 4 color designs are the most cost-effective. For full-color, photographic art, DTF transfers are often a better fit.

Do you offer artwork cleanup and design help?

Yes. Our art team vectorizes logos, separates colors, and preps files daily. Just send us what you have and we will handle the rest.

Ready to get your design on shirts? Send us your file and our Westlake, FL team will make sure it is press-perfect. Arnold Prints® serves Palm Beach County and ships fast worldwide. GET A QUOTE, learn more about our screen printing services, call 561-323-7573, or email your artwork to sales@arnoldprints.com for a free review.