How big is too big for a modal dialog?

The size of modal window shouldn't be too large — the modal window shouldn't take the entire screen. Ideally, it shouldn't take more than 25% of the screen for the overlay.

1. How big should modals be?
2. How do I make modal dialog bigger?
3. What is the size of modal in Bootstrap 5?
4. How do I set modal popup height?

How big should modals be?

Don't make your modals too big

By restricting the size of your modals to 20-25% of the overall user interface, and by keeping what the user was doing previously behind a translucent background, you can keep the disruption to a minimum.

How do I make modal dialog bigger?

Modal Size

Change the size of the modal by adding the . modal-sm class for small modals, . modal-lg class for large modals, or . modal-xl for extra large modals.

What is the size of modal in Bootstrap 5?

Modal Size

Default is 500px max-width.

How do I set modal popup height?

modal-body use calc() function to calculate desired height. In above case we want to occupy 80vh of the viewport, reduced by the size of header + footer in pixels. This is around 140px together but you can measure it easily and apply your own custom values. For smaller/taller modal modify 80vh accordingly.