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Paste or upload
Paste an image from the clipboard, or drop and multi-select transparent PNGs. Every file joins the local processing queue.
FILE.02 PNG WHITE OUTLINE
PNG White Outline
Add a clean, smooth white outline to transparent PNGs with paste support and batch upload.
Upload transparent PNGs
or click to choose · paste images · batch selection supported
Transparent PNG · files stay in this browserUploaded images will appear in this local queue
§ 01
How to add a white outline to transparent PNGs
2
Tune the parameters
The defaults are 5 px width and 0.8 smoothing. Enable canvas expansion when the complete edge outline must be preserved.
3
Process and download
Click Process all, inspect each result, and download files individually or as a batch.
§ 02
A local outline tool made for transparent PNGs
The tool reads the PNG Alpha channel, builds a contour, and expands it with an equal-width Euclidean distance field. The original artwork is composited back over the outline so its colors and transparency remain intact.
The default mode preserves the original dimensions for stickers, emoji, and icons. Enable canvas expansion to add room around the image and keep outlines near every edge.
§ 03
Parameter notes
Outline width is measured in source-image pixels. Smoothing softens the contour so edges look more natural while keeping the outline crisp and defined.
The tool automatically applies high-quality edge processing for a smoother result, with no extra configuration required.
§ 04
Frequently Asked Questions
Q1Why does it accept PNG only?
The outline comes from the Alpha channel. PNG preserves transparency and semi-transparent edges, while JPG and similar formats do not.
Q2Are images uploaded to a server?
No. Decoding, processing, compositing, and downloading happen in the current browser, with no upload or browser-storage write.
Q3What are the recommended starting settings?
The default outline width is 5 px and smoothing is 0.8. The canvas keeps its original size unless you enable expansion.
Q4How are batch outputs named?
The tool adds -outlined before the extension and exports PNG files. For example, sticker.png becomes sticker-outlined.png.