Knock out black, add an outline

What is a knockout?

A knockout leaves the black areas of a dark-shirt design unprinted and transparent. The shirt is already dark, so there's no need to print black; the fabric itself shows through.

You win three ways: no black ink or white underbase is spent, the print is thinner and softer, and the shirt breathes. Vintage and distressed textures are made this way too.

Which colors can I remove?

• Black: removes by darkness regardless of hue; dark grays and near-blacks go too
• A color you pick: if the shirt is navy, you can remove the navy areas
• Click a color in the preview to pick the one to remove
• Tolerance widens or narrows the range of tones removed

Outline (sticker border)

Adds a smooth, continuous border around the design, set in millimeters. A white outline makes the design pop on dark shirts; a colored one carries your brand color. Fill inner gaps closes letter counters too for a sticker look.

The outline is drawn after the knockout, so each piece of a design without its black background gets its own outline.

Hard edges for DTF

The output has no semi-transparent pixels: every pixel is fully opaque or fully transparent. A DTF printer lays white under semi-transparent pixels too, so soft edges print as a white halo. Detached pieces under 1 mm² can be removed as well, so nothing breaks off in transfer or stays on the film.

Preview on your shirt color

See the result on black, gray or any shirt color you choose. The full-size PNG keeps the file's DPI and goes into the gang sheet builder in one click.

Privacy

Your file isn't stored on the server: every preview and download is processed in memory, then discarded.

FAQ

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