The End achievement toast is the one that never fires
Advancement toasts are drawn at the game's own pixel size, and the End achievement is the one players screenshot most and reproduce worst.
The End achievement is the most requested toast to fake, and almost every recreation of it is wrong in the same way: the author draws it at whatever size looks nice on screen, then scales it down. A toast is not a picture of a toast. It is a sprite drawn at the game's own pixel grid, and the grid is the whole point.
What the toast actually is
An advancement toast is a small window: a background frame, an icon slot, and two lines of text. The icon is the advancement's display item, rendered at the same resolution the inventory uses. Nothing in it is smooth. Every edge is a whole number of pixels, because the game draws it that way and then the window scales it to your GUI scale.
That last part is the trap. GUI scale is an integer multiplier, so a toast at scale 2 is exactly twice the pixels, never 1.5 times. If you export your PNG at a fractional size, it will look correct in your editor and wrong in every screenshot it is compared against.
Java and Bedrock do not agree
Java draws the toast from the top-right of the screen and slides it in horizontally. Bedrock anchors it top-right as well but the frame art and text metrics differ, so a PNG traced from a Java screenshot will sit a few pixels off in Bedrock. Pick the edition you are matching before you start drawing, not after.
The pixel-size rule
| Element | Drawn at |
|---|---|
| Icon | the item's native texture size |
| Frame border | 1 pixel, unscaled |
| Text | the game's font grid, 1 pixel per pixel |
A 16x16 icon is 256 pixels of data. Blowing it up with bilinear filtering destroys the only thing that made it read as Minecraft. Use nearest-neighbour, or better, draw at native size and let the viewer's own scaling do the work.
Transparency is not optional
The toast has rounded, semi-transparent edges where it meets the world behind it. Export as a transparent PNG with the alpha channel intact. If your tool flattens onto white, the toast will carry a white halo into every thumbnail it appears in.
Rank badges use the same grid
Server rank badges are the same problem with a different silhouette: a small icon, a border, and text, all on the same pixel grid. If you can draw one, you can draw the other, and the pixel discipline that makes a badge look official is identical to the one that makes a toast look real.
Build either one at native pixel size, with alpha, and no resampling, in the Achievement & Badge Makers.