BMP (Bitmap) - Don't Use

TIFF (Targetted Image File Format) - Don't Use

GIF (Graphic Interchange Format)

256 Colors (35Kb)	64 Colors (22Kb)	16 Colors (13 Kb)
256 Colors (8Kb)	64 Colors (6Kb)	16 Colors (4 Kb)

JPEG (Joint Photographic Experts Group)

Maximum (68Kb)	High (20Kb)	Low (7Kb)
Maximum (18Kb)	High (9Kb)	Low (5Kb)

PNG (Portable Network Graphics)

24-Bit (97Kb)	8-Bit (30Kb)
24-Bit (18Kb)	8-Bit (5Kb)

Transparency

JPEG (12Kb)

GIF (5Kb)

PNG (7Kb)

Other:

JFIF (JPEG File Interchange Format)
AVIF (AV1 Image File Format, based on video)

Apple:
HEIF (High Efficiency Image File Format)
HEIC (High Efficiency Image Coding)

Google:
WebP

Scalable Vector Graphics

Raster X1 (2KB)	Raster X4 (2KB)
SVG X1 (113B)	SVG X4 (113B)