jimp
An image processing library written entirely in JavaScript.
intrinsic-scale
Replicate background-size: cover/contain (scale+crop) for canvas/CSS/Node/… on any type of media.
v-viewer
Image viewer component for vue, supports rotation, scale, zoom and so on, based on viewer.js
pixel-scale
Get the pixel scale of an image, or scale it up or down without quality loss. Useful for pixel art!