How to Prep Artwork Files for Mobile DTF Printing

Almost every reprint we have ever done at an event traces back to a file, not a printer. The rig works. The transfers work. What fails is a logo pulled off a website at 400 pixels wide, or a "transparent" PNG that turns out to have a white box behind it, or a brand blue that looked right on a laptop and prints like a Dodgers cap.

None of that is hard to avoid. Here is exactly what a mobile DTF setup needs from your artwork, in the order it matters.

What the printer actually needs

DTF prints CMYK plus a white underbase onto a film, which is then powdered, cured, and heat-pressed onto the garment. Two consequences follow.

First, the white underbase means dark garments are not a problem — unlike most other methods, a photographic image on a black shirt is a normal Tuesday. Second, the underbase is generated from your file's transparency. Wherever your file is transparent, no white is laid down and the garment shows through. Wherever it is not, white goes down. That single fact explains most artwork problems.

The short spec: a PNG with a genuine alpha channel, at 300 DPI at final print size, or vector artwork (AI, EPS, PDF, SVG) with fonts outlined. That is it. Everything below is elaboration on why.

Vector versus raster, and when raster is fine

Vector is preferred because it scales to any size with clean edges. If you have a logo, your designer has an AI or EPS somewhere — ask for it before you send a screenshot from a slide deck.

But raster is genuinely fine when it is big enough. A 300 DPI PNG at final size means a 12-inch-wide chest print needs to be about 3,600 pixels wide. Photographs, textures, gradients, and hand-drawn art are all raster by nature and print beautifully through DTF. The failure is not raster — it is small raster scaled up, which produces soft edges and visible pixel stair-stepping that the film reproduces faithfully.

If you outline fonts in your vector file, do it before sending. If you cannot, send the font files along with the artwork. A file that opens with Helvetica substituted for your brand typeface is a problem nobody catches until the shirts are wrong.

Transparency and edges: the rules that prevent most reprints

Check the transparency for real. Open the PNG over a dark background, not the default white canvas. A surprising number of "transparent" files carry a white rectangle, a faint halo, or semi-opaque anti-aliasing left over from a bad background removal. All three print.

Beware the soft cutout. Artwork masked out of a photo often has feathered edges. Feathered edges get a partial underbase, which reads as a grey fringe on a dark garment. Hard-edged cutouts print clean; feathered ones look like a mistake.

Avoid thin strokes and tiny type. Anything under about 1.5 points at print size can break up during weeding and pressing. If your logo has a hairline rule or 5-point legal text, either thicken it or drop it — nobody at an event is reading it anyway.

Do not put a drop shadow on a transparent background unless you actually want it printed. Shadows carry partial opacity and print as a grey smudge on dark fabric.

Color: what "brand blue" means on a transfer

Your brand book gives you a Pantone. DTF is a CMYK process, so a Pantone becomes the nearest achievable CMYK build. For most colors that is close enough that nobody notices. For a few — saturated oranges, bright greens, and certain deep blues and purples — the CMYK version is visibly less punchy.

Two practical moves. Send the Pantone reference along with the file so we know what you are aiming at rather than guessing from RGB values. And if the color is genuinely non-negotiable, tell us early enough to run a press proof on the actual garment before event day. A proof on the real fabric answers the question in a way a monitor never will.

Also: build files in RGB or CMYK consistently, do not mix. Files assembled from a mix of color spaces produce color shifts between elements that are maddening to chase on site.

Sizing artwork across garment types

One file rarely serves everything. Standard placements and sizes we work from:

Adult full-front chest prints run 11 to 12 inches wide. Youth sizes want 8 to 9 inches, and a full-size adult print on a youth small looks absurd. Left-chest marks run 3.5 to 4 inches wide. Hat front panels want 2.5 to 4 inches wide and no more than about 2.25 inches tall. Tote bags can take 10 to 12 inches, but check the bag's usable panel — gussets and handles eat space.

If your event is running multiple item types, send one master file at high resolution and we will scale placements from it, or send per-placement files if the artwork needs to change (a wide layout for the chest, a stacked lockup for the hat). Telling us which you want beats us guessing.

The handoff checklist

Send, ten business days before the event where possible: final artwork in vector or 300 DPI PNG at size; fonts outlined or included; Pantone references for any critical colors; the garment colors you have ordered; and the placements you want on each item type. Name the files something human — acme-front-12in.png beats final_FINAL_v3(2).png.

If art is late, say so early. We can often work with a rough file to test press settings and swap in the final at the last minute, but only if we know it is coming. Silence is what causes scrambles. Our same-day checklist lays out the full reverse timeline if you want the surrounding context.

Frequently asked questions

Can you fix low-resolution artwork?
Sometimes. Simple logos and type can often be redrawn as vector cleanly. Photographs and complex illustrations cannot be meaningfully upscaled — sharpening a 500-pixel JPEG produces a crunchier 500-pixel JPEG. If it is a logo, ask us before you accept a soft print.

Does DTF print white ink?
Yes. White is laid down as an underbase under the color, which is what makes full-color printing on dark garments possible. It also means a design that is white-only prints just fine on black.

How many different designs can we run at one event?
As many as you like — DTF has no per-color or per-design setup cost, which is its main advantage over screen printing on a live floor. The practical limit is guest decision time, not the machine. Six to eight options keeps a line moving; thirty stalls it.

Send the artwork

Have files ready, or think you might not? Either way, send the event details and we will review the artwork before you commit to anything. It takes us a few minutes and it is the cheapest insurance in the whole process.