Block viewer and playground
Pick a block or an item, turn it, size it, tint it — and copy the URL that produces exactly what you are looking at. Every control is a query parameter of the render API.

https://blockrender.dev/render/block/grass_block.png?size=512Frequently asked questions
Is this a resource pack editor?
No, and it deliberately is not one. It shows you Minecraft’s own blocks and items as they are, and hands you the URL that renders them. If you want to edit textures, a pack editor is the right tool and this is not it.
Which blocks can I look at?
Every block and item in Java Edition 26.2 that has a model — type any id into the field, or browse the block catalogue. Chests, banners, beds and a few dozen others are drawn by the game itself and have no model to show.
Can I link the view I set up?
Yes. The address bar is rewritten as you move the controls, so the page you are looking at is the link. Reload it, share it, paste it in a bug report.
Do I need an account to use the URL it builds?
No. There is no key and no signup. Put the URL in an img tag and it works.
Every parameter is documented in the parameter reference, and the examples page has recipes worth copying.