Sticker Border Maker
Add a clean white outline around any transparent PNG. Tune the thickness, color and smoothness, then download a print-ready sticker. Everything runs in your browser — your file is never uploaded.
For live speed the preview may use a lower resolution — the download is always rendered at your image's full resolution.
Upload a transparent PNG to reveal the border controls.
Frequently asked questions
What is a die-cut border?
A die-cut border is the solid outline — usually white — that hugs the shape of a sticker so the cutting machine has a clean edge to follow. Instead of a plain rectangle, the sticker is cut around your artwork with a small margin, giving that classic "peel-off" die-cut look. This tool grows your PNG's silhouette outward by the thickness you choose and fills it with a solid color to create that margin.
How thick should a sticker border be?
For most die-cut stickers a border of roughly 1/16" to 1/8" (about 2–4 mm) works well — that translates to around 18–48 px at 300 DPI. Thin borders (10–20 px) look modern and subtle; thicker borders (40–60 px) read as bold and are more forgiving for the cutting machine's tolerance. When in doubt, most print shops recommend at least ~2 mm so the white edge stays visible even if the cut drifts slightly.
Why do I need a transparent PNG?
The border is generated from your image's transparency — the tool traces the edge between the visible pixels and the transparent background, then expands it. If your file has a solid (non-transparent) background, there is no silhouette to follow, so the border just wraps the rectangular image edges instead of your artwork. Remove the background first and export as PNG for a true die-cut outline.
Is my image uploaded anywhere?
No. Everything happens locally in your browser using the HTML canvas — your file is never sent to a server, and nothing is stored. You can even disconnect from the internet after the page loads and the tool will keep working.