What size are LINE stamps?

LINE stamps are PNG images with a transparent background, up to 370×320 pixels per stamp. The file must be under 1 MB. This tool automatically resizes and centers your images to the correct dimensions.

How many stamps can I submit to LINE?

LINE stamp sets require 8, 16, 24, 32, or 40 stamps. You can upload that many images here and download them all as a ZIP.

Can I remove the background automatically?

Yes. Enable AI background removal and each image will have its background removed before being resized into the stamp canvas.

Are my images uploaded to a server?

No. All processing — resizing, background removal, ZIP packaging — runs entirely in your browser. Your images never leave your device.

LINE Stamp Maker — Create Custom LINE Stickers Online

Turn any image into a LINE stamp in seconds. Auto-resizes to the exact LINE dimensions (370×320px), supports AI background removal for transparent stickers, and exports a ready-to-submit ZIP. 100% browser-based — no upload required.

Read our full guide

Drop images here, paste, or click to select

Features

Supports Regular (370×320), Big (563×563), and Emoji (180×180) sizes

AI background removal for transparent PNG stamps

Upload up to 40 stamps at once

Download all stamps as a ZIP file ready for LINE submission

100% browser-based — images never leave your device

How to Use

Upload 8, 16, 24, 32, or 40 images (LINE requires specific counts)

Select the stamp size and toggle AI background removal if needed

Click Process to resize all images to LINE stamp dimensions