Standard logo size
300px x 300px should be the maximum size of a social media logo design
500px by 500px is usually the size of a logo design artboard.
200KB should be the file size of your logo if you're posting it online.
20px to 30px should be the minimum height of a logo for a website
Logos placed on shirts or jackets in a left chest position should not exceed 3.75" x 3.75" in size.Logos are usually sized to fit within 3 to 3 1/2" wide.
For a standard-sized letterhead, you'll want to choose an 8½ x 11 document
AI, primary source file, use multiple artboards for variants.
EPS, universal format for programs aside from Illustrator and other Versions.
PNG web format.
SVG web format for responsive design.