Image Format Glossary
Plain-language definitions for image formats and conversion terms.
AVIF
A next-generation image format based on the AV1 video codec, offering up to 50% better compression than JPEG.
Alpha Channel
An extra image channel that stores transparency information per pixel.
BMP
An uncompressed Windows bitmap format with native support across Windows applications.
Color Depth
The number of bits used to represent the color of a single pixel.
GIF
A universally supported format for simple animation, limited to 256 colors per frame.
HEIC
Apple's High Efficiency Image Container, used by iPhones to store photos in about half the space of JPEG.
JPEG
The universal lossy photographic format, supported everywhere, with adjustable quality.
Lossless Compression
Compression that reduces file size while reconstructing the original image pixel-for-pixel.
Lossy Compression
Compression that discards some image detail to achieve much smaller files.
PNG
Portable Network Graphics — a lossless format with transparency support, ideal for logos, icons, and graphics.
Raster Image
An image made of a grid of pixels, as opposed to a vector image defined by mathematical paths.
TIFF
A lossless format used as the print and archival standard, supporting high color depth.
WebP
A modern image format by Google offering both lossy and lossless compression, typically 25–35% smaller than JPEG.