Use concrete format decision rules and repeatable checks for dimensions, transparency, compression, SVG traces, PDF pages, privacy, and browser limits.
The format guide explains transparency, compression, vector versus raster output, browser processing, and practical format choices.
PNG and WebP can store transparent pixels. JPG cannot and must flatten transparency onto a solid background.
JPG and WebP quality values are starting points, not universal measures. Reducing dimensions to the actual display size can save more than heavy compression.
Browser canvas exports normally remove EXIF and other metadata. Animated inputs are treated as a single still frame.
Large images, high PDF DPI, and big batches can exceed available memory. Less-common codecs can work differently between browsers.