Yes, many blinds (especially faux wood and aluminum) can be cut down. Measure carefully and use a hacksaw for metal blinds or a fine-tooth saw for wood/faux wood blinds.

Measure the height from top to bottom of the window opening. For width, divide the total window width by 2 (for paired shutters).

Tighten loose hinges or screws. If the shutter itself is warped, replace individual slats or panels if possible.