01
Upload the design
Transparent PNG works best; JPG and WEBP work too.
BeamTake/Tools/Black knockout and outline
Add an outline to your PNG design
Add a smooth, continuous outline around a transparent PNG, set in millimeters. A white outline makes the design pop on dark shirts; fill the inner gaps for a sticker look.
Doesn't use your minutesHard-edged DTF PNGFiles aren't stored
mmwidth
coloryour choice
stickerlook
0semi-transparent px
PNGDPI kept
With this tool
What you get
- Width set in millimeters
- Any outline color
- Fill inner gaps for stickers
- Hard edges, DTF-ready
How it works
Get startedAdd an outline to your PNG design: step by step
02
Set knockout and outline
Pick the color to remove, the tolerance and the outline width; the preview shows the shirt color.
03
Download PNG
Download the hard-edged, print-ready file or add it to a gang sheet.
When does an outline help?
- To separate a dark design from a dark shirt
- For a white sticker or label border
- To give a clean cutting margin for plotter-cut designs
- To make the pieces of a black-knockout design stand out
Choosing the width
A 1–3 mm outline at print size suits most designs. Outlines thinner than 0.5 mm can break during transfer. The width is entered in millimeters and converted to pixels using the file's DPI.
FAQ
Is the outline semi-transparent?
No. The outline and design have hard edges with no semi-transparent pixels, so there's no white halo in DTF.
Can I add an outline without the knockout?
Yes, turn off the knockout and turn on only the outline.
Related pages
Other DTF tools
From file to roll, in one panel
DTF print preflight
Check your design file before printing: resolution, background, white halo, thin lines and small pieces that may fall off.
OpenBackground removerPrint-ready transparent PNGs for DTF and gang sheets: no white halo, semi-transparent edges or specks.
OpenAI image upscalerUpscale low-resolution designs up to 4x; crisp lines, 300 DPI print size, transparency preserved.
OpenGang sheet builderAuto-nest your designs onto a DTF roll: spacing, rotation, shortest length; 300 DPI PNG and PDF.
OpenBulk names and numbersGenerate a name and number PNG for every player from a list for team jerseys; arc, outline, 300 DPI, one click to gang sheet.
OpenT-shirt mockupSee your design on a T-shirt at real print size: colors, front and back, chest or pocket logo; download a PNG.
Open
Preflight is free
Add an outline to your PNG design: try it today
Print preflight is included in the free plan; the other DTF tools are on DTF plans.
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