“Convert image to LINE sticker” sounds like one action, but it is really three: pick the right format, reshape the image to LINE’s spec, and make the background transparent. Get those three right and any source — a downloaded PNG, a camera JPG, a screenshot — becomes a clean sticker. Here is the full process using the free LINE sticker cutter, entirely in your browser with no upload of your file.
Start with the right format
LINE stickers are PNG files. That single fact decides most of what you do next:
- PNG — ideal. Supports transparency, so your sticker floats on the chat background instead of sitting in a box.
- JPG / JPEG — common but flawed for stickers. No transparency, so any “background removed” result snaps back to white. Convert to PNG before exporting.
- WebP / HEIC — often rejected by upload tools or hard to edit. Convert to PNG first.
- Screenshot (PNG) — fine as a source; just crop tightly and clear the backdrop.
If your source is already a PNG with transparency, you skip the background step. If it is a JPG or screenshot, plan for one extra cleanup pass.
Step by step: image → sticker
1. Load the image
Open the HailouTec Sticker Cutter and load your file. If it is a sticker sheet (a grid of several images), split it into cells first, then convert the cell you want.
2. Crop to the subject
Tight cropping around the subject is the fastest quality win. Leave a small margin so edges are not clipped, but drop empty space — LINE shows stickers in a square, and dead space shrinks your art.
3. Resize to 320×320
LINE’s main sticker canvas is 320 × 320 pixels. Resize your cropped subject to fit that square, centered. The exact numbers — including the tab and popup sizes — are in the size & format guide →
4. Make the background transparent
Use edge-based background removal: it clears the backdrop from the outer border inward and stops at the first non-background pixel. That keeps white that belongs to your art (eyes, highlights, text) while the surrounding photo background disappears. Avoid blanket “delete all white” tools, which also eat the white inside your subject.
For a deeper walkthrough of this step, see remove white background, keep transparency →
5. Export as transparent PNG
Save as PNG, not JPEG. PNG keeps the alpha channel; JPEG would re-add a white box. Your file is now LINE-ready.
Common mistakes that get files rejected
- Saving as JPEG. The #1 mistake. Transparency is lost and a white rectangle returns. Always export PNG.
- Wrong dimensions. An oversized or non-square image gets rejected or squished. Hit 320×320 for the main canvas.
- Leftover background haze. A “white” sheet is often #F8F8F8. Use a small tolerance so near-white is also cleared, but keep it tight enough not to eat light-gray art.
- Subject touching the border. Pure-white art that reaches the canvas edge can be mistaken for background and removed. Add a transparent margin.
- Too much empty padding. A tiny subject in a huge transparent square looks small in chat. Crop closer.
FAQ
Can I convert a JPG that has no transparency?
Yes. Load it, crop, resize to 320×320, then remove the background with edge-based clearing, and export PNG. The JPG’s missing transparency is recreated during the background step.
Will my image be uploaded to a server?
No. The cutter processes everything locally in your browser. Your file never leaves your device, which also keeps it private.
What if the background will not fully clear?
Raise the removal tolerance slightly to catch off-white, and make sure the subject is not fused with the backdrop at the edges. Preview each result before exporting.
Can I convert multiple images at once?
If your source is a sticker sheet, split it into cells first, then convert each cell. For unrelated images, process them one at a time so each gets a clean crop and size.
Is PNG always better than JPG for stickers?
For stickers, yes — transparency is what makes them look right in a chat. JPG only makes sense as a source you plan to convert. See the size guide → for format limits.
Open the free LINE sticker cutter → and convert your first image to a transparent sticker in a minute.