Why is transparency essential for stickers?
A sticker is defined by its outline. Unlike a normal photo, which fills a rectangle, a sticker is a cat, a logo or a speech bubble with empty space around it — and that empty space has to be genuinely empty. That is what an alpha channel provides: every pixel carries an opacity value, so the area outside the artwork is recorded as fully transparent. PNG supports a full alpha channel, which is why it is the natural home for sticker artwork. To go deeper on how that works, read PNG transparency. If your source image still has a background, you can make it transparent first.
Digital stickers for WhatsApp, Telegram and iMessage
Chat stickers all share one rule — a transparent background so the sticker floats over the conversation — but they differ in the specifics. WhatsApp uses 512 by 512 pixel stickers and stores them as WebP, so the cleanest path is to build a 512 by 512 transparent PNG and convert it. Telegram and iMessage accept transparent stickers at their own dimensions. Across all of them the workflow is the same: design on a transparent canvas, size the square correctly, then export. If your artwork is the wrong dimensions you can resize the PNG to the exact square the app wants.
Die-cut and print stickers
Physical stickers raise the bar on resolution. A print shop typically wants artwork at 300 DPI so the design stays sharp at its real-world size, supplied with either a transparent background or a defined cut path — the vector outline that tells the cutting machine exactly where to slice the die-cut shape. A high-DPI transparent PNG is the standard for full-colour, photographic sticker art, and TIFF is widely accepted for the same job. Simple, solid-colour or logo-style designs are often supplied as vector instead, because a vector cut line gives the crispest possible edge. Whatever the source, keep it large: you can always scale a high-DPI master down, but enlarging a small file leaves a soft, jagged print.
Why can't JPG do the transparent edge?
JPG has no alpha channel at all, so it physically cannot store a transparent area. Save a sticker as JPG and the empty space around your artwork is filled with a solid colour — usually white — leaving you a rectangle instead of a shape. There is no clean outline for a chat app to overlay or a cutter to follow. On top of that, JPG's lossy compression frays the sharp boundary a sticker lives or dies by. For anything sticker-shaped, reach for a transparent PNG and browse the full toolkit on the tools page.
Frequently asked questions
- What format should a sticker be?
- A transparent PNG. A sticker is defined by its irregular shape, and only a format with an alpha channel — PNG, or WebP for some chat apps — can store the see-through area around that shape so the sticker floats on any chat bubble or surface instead of sitting in a box.
- What size and format do WhatsApp stickers need?
- WhatsApp stickers are 512 by 512 pixels with a transparent background, and the app uses WebP for them. The simplest workflow is to design the sticker as a 512 by 512 transparent PNG, then convert it to WebP. Telegram and iMessage also expect transparent stickers at their own sizes.
- What format do printed die-cut stickers need?
- Printers want a high-resolution file, usually 300 DPI, with either a transparent background or a defined cut path so the machine knows where to slice the shape. A high-DPI transparent PNG works for full-colour artwork; TIFF is also accepted, and simple logo-style designs are often supplied as vector for the cleanest cut line.
- Can I use a JPG for a sticker?
- No. JPG has no transparency, so the artwork arrives welded to a solid rectangle — there is no see-through edge for the sticker shape. Its lossy compression also fuzzes the crisp outline a sticker depends on. Always use a transparent PNG instead.