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TeePublic Image Prep

TeePublic prints from a hi-res PNG: 8 bits per channel, RGB, 150 PPI or higher, and at least 1500×1995 px (10×13.3 in). Drop in any image and this tool builds that file, centers the art without stretching it, removes a flat backdrop, and applies the Prep School 40% opacity rule.

TeePublic Image Prep

Makes an 8-bit PNG on TeePublic’s 10×13.3 in print area, at least 1500×1995 px and 150 PPI.

Print-shaped canvas from 1500×1995 px at 150 PPI up to 3000×3990 px at 300 PPI, using your file’s own detail when it fits.

Drop artwork here

PNG, JPG, or WebP. You can also paste with Ctrl/Cmd+V.

How to Use This Tool

  1. Drop, browse, or paste a PNG, JPG, or WebP.
  2. Leave the print file on Auto, or choose the 1500×1995 minimum or the 3000×3990 file.
  3. Keep background removal and the 40% opacity rule on unless you already fixed those.
  4. Turn on cool red midtones only when reds, blues, or skin tones shift in a test print.
  5. Check the light and dark shirt previews, then download the PNG and upload it to TeePublic.

Features

  • 8-bit RGB PNG with the pixels-per-inch tag set
  • Print area of 10×13.3 in, from 1500×1995 px at 150 PPI up to 3000×3990 px at 300 PPI
  • Artwork is centered and not stretched
  • Flat edge color removed so the shirt shows through
  • Pixels under 40% opacity cleared; the rest stacked like a duplicated layer
  • Optional red-channel Levels adjustment at gamma 0.90, 0.75, or 0.60
  • Light and dark shirt preview
  • Processed in the browser — the file is not uploaded

Frequently Asked Questions

What file does TeePublic ask for?
A hi-res PNG at 150 PPI or above, sized 1500×1995 px or larger. TeePublic accepts RGB and converts it to CMYK with their own profiles. Use 8 bits per channel. 16-bit files are larger, slower to print, and the extra data is not visible.
What is the 40% opacity rule?
Transparencies, gradients, and glows under 40% opacity either show the white underbase (a faded, blobby print) or disappear. This tool clears those pixels and raises the rest by stacking them, the same idea as duplicating the layer in Photoshop until it is opaque enough.
Will neon colors print as they look on screen?
No. Direct-to-garment printers have no fluorescent ink, so bright green, cyan, and magenta often print duller. Reds and deep blues can also shift: blues toward purple, grays warmer, skin tones more orange. Cool the red channel only if a test print shows that shift.
Does this turn gradients into halftones?
No. Prep School suggests halftone dots or lines under 25–35 lines per inch, at an irregular angle such as 22.5°, for glows you want to keep. Build that in your design file. Dots only a few pixels wide let the white underbase show through.
Which shirt colors should I enable?
Dark artwork reads better on light shirts. Light artwork reads better on dark shirts. Clear holes in the design use the shirt color, so those designs only work on a few garments. Disable colors that do not look right, and set the best one as the default.

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