A white box printed on a black shirt is the classic beginner mistake. Get a clean transparent file first.
DTG and DTF printers print whatever pixels are in the file — including a white background. Designs need true transparency, with clean edges so no fringe shows on dark garments.
Remove the background with BiRefNet, then upscale to your printer's required size, typically 4500×5400 px at 300 DPI for a full front print.
Upload the design: Even if it is a JPG with a white background.
Remove the background: Precision mode avoids white halos on edges.
Upscale to print size: 4K output or 2x until you reach your printer's spec.
No white box: True transparency around the design.
No halo: Clean edges on dark shirts.
Print-size: Upscale while keeping alpha.
What file size do POD printers want? Commonly 4500×5400 px at 300 DPI for a 15×18 in print area; check your provider.
Why is there a white outline on dark shirts? Leftover semi-white edge pixels from a rough cut-out. Precision matting minimises them.
Should I vectorize instead? For screen printing with flat colours, a vector is ideal — use the Vectorizer.
Is it free to try? Yes. Signed-in accounts get 10 free credits every day, and new users can try Pro free for 7 days — cancel anytime. No watermark on any plan.