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A quick way to understand who this helps, what it solves, and where it connects next.
People preparing stickers, logo badges, thumbnails, marketplace cutouts, and icon-like PNG assets that need separation from the background
Adding a visible edge around transparent artwork without moving into a bigger editor or repainting the asset by hand
Capture add-outline-to-PNG intent with a direct browser-first utility tied to transparent asset workflows
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
To add an outline to a PNG, upload a transparent image and set the outline thickness, color, edge mode, and softness. The generator traces the alpha shape automatically and exports an outlined PNG, so you do not have to redraw the edge by hand.
The classic sticker outline is a thick white or solid-color stroke that follows the subject's shape. This tool reproduces that look in one step and keeps the original artwork inside the result, ready to use as a sticker or cutout.
All outline generation happens locally in your browser, so the PNG stays on your device and nothing is sent to a server.
Transparent PNGs often need more contrast when they sit on noisy or changing backgrounds. A clean outline around the image is one of the fastest ways to make icons, stickers, and product cutouts read clearly.
Centered edge mode keeps the outline closer to the visible edge instead of pushing it fully outward, which can help on softer alpha shapes. Outside-only mode adds the full stroke beyond the subject for the bold sticker look, so you can match the asset to where it will be used.
Short answers for the questions people usually have before trying a utility like this.
Upload a transparent PNG, set the outline thickness, color, edge mode, and softness, and the tool traces the alpha shape and exports an outlined PNG. It works well for sticker outlines and product cutouts.
Yes. This PNG outline generator is free and runs entirely in your browser with no account required.
Yes. The tool adds an outline around the alpha shape and preserves the visible artwork inside the export.
It keeps the outline closer to the visible edge instead of pushing it fully outward, which can help on softer alpha shapes.
No. The outline generation happens locally in your browser, so the image never leaves your device, and it works on mobile too.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Generate a stroke around the visible alpha shape for stickers, logos, icons, and thumbnails without leaving the browser.