How to Make LINE Sticker Backgrounds Transparent | Clean Cutouts and White Background Fixes

Transparency and a white background are different

A transparent pixel has no visible color. A white pixel has a color, even though it may look like empty space on a white canvas. If a cutout tool fills the outside with white, LINE will display that white area as part of the sticker.

A white border around the character can be intentional and useful. The problem is a white rectangle or a pale halo that was accidentally included in the exported image. Look at the file on a checkerboard preview and on a solid colored background before deciding that the cutout is complete.

Why a transparent background can turn white

White backgrounds usually come from one of four places: the original photo was flattened, the removal tool exported a JPEG, the editor placed a white layer behind the character, or the viewer is showing transparency as white. The last case is only a preview detail; the first three change the actual file.

• The source image already contains a white rectangle.
• The export format is JPEG or a PNG without the alpha channel.
• A background layer was left visible during export.
• Semi-transparent edge pixels create a pale halo on a dark chat background.

Five steps for a clean cutout

Start with a photo where the subject and background have different colors. Remove the background, zoom in around the hair, ears, fingers, and paws, and erase leftover patches without cutting into the silhouette. Then place the result over a dark color and a light color to reveal different edge problems.

• Choose a sharp, well-lit photo with a clear subject boundary.
• Remove the large background area first, then refine small gaps.
• Inspect the edge at 100% and at the size it will appear in LINE.
• Export as a transparent PNG with no hidden white layer.
• Open the exported file in another viewer and test it on a colored background.

Hair and pet fur: optimize for small display

Trying to preserve every single hair can make the edge noisy and can leave a white fringe. For a sticker, a stable silhouette and a recognizable face matter more than tiny strands that disappear when the image is reduced. Keep the larger tufts and distinctive ears, whiskers, or tail shape, and simplify the rest when necessary.

Zoomed-in editing is useful for finding mistakes, but the final decision should be made at the sticker's actual size. If the character becomes hard to recognize, enlarge the subject or simplify the edge instead of adding more fine detail.

Keep a white outline separate from the margin

A white outline can make a character stand out in a dark conversation. It should follow the character, while the outside area remains transparent. Do not use the outline as a substitute for the roughly 10px safety margin around the artwork. The margin is empty space; the outline is part of the design.

Check corners, hands, ears, and text separately. A tight crop can clip the outline during resizing, while an oversized canvas can make the character too small. The safest result has an even breathing space without wasting most of the sticker area.

Final transparency check before LINE submission

Before you make a ZIP, open several exported PNGs outside the editor. Confirm that the canvas has the expected dimensions, the background is transparent, the text is readable, and no edge has a light box around it. Check the main and tab images separately because they have their own sizes and visibility requirements.

• The file is PNG and retains an alpha channel.
• There is no accidental white rectangle or colored layer.
• The character and lettering stay inside the safe area.
• The image still reads on both light and dark backgrounds.
• The ZIP contains only the files required for the chosen LINE format.

How to avoid cutting out 40 images one by one

Manual cutouts are fine for a small set, but repeating the same cleanup forty times is tiring. Stampo can generate a character set from one photo, apply the transparent-background processing, and export a LINE-ready ZIP. You can still inspect and edit the speech lines in the browser editor before downloading.

The fastest workflow is not to skip checking. Generate a set, review the full sheet for consistency, then open the few images that need detailed edge or text corrections. That keeps the time-saving part of batch generation without giving up final control.

Why does my transparent PNG look white?

The viewer may be showing transparency as white, or the file may contain real white pixels. Place the PNG over a colored background in another editor or viewer to tell the difference.

Should I remove the white outline too?

Not necessarily. Keep it if it is part of the design, but make sure the area outside the outline is transparent and that the outline does not merge into the text or crop edge.

Can I submit a JPEG sticker?

LINE sticker artwork is normally submitted as PNG with the required transparency and dimensions. Check the current official requirements before uploading.