Use an image editor’s resize or canvas size tool
Set the same width and height for every image
Keep the aspect ratio locked if you do not want distortion
Crop images to a uniform frame size
Add padding or borders to smaller images to match the target size
Batch process multiple images with the same dimensions
Export all images using the same resolution and file settings
Use an online bulk image resizer if needed
Check the final dimensions of each image before saving
Save all images in the same format and size preset