You should note that file sizes should be less than 150 KB. If you want to include stock photos, these can go over the file size limit. In this case, you might try resizing the images online. Consulting a graphic designer should give better results.

They can only accept PNG, JPG and GIF files. Due to limitations, JPG is the most commonly used file type.

Most Commoin Google display ad sizes: what are the most popular sizes?

Square and rectangle

200 × 200 – Small square (Most Common Google display ad size)

240 × 400 – Vertical rectangle

250 × 250 – Square (Most Common Google display ad size)

250 × 360 – Triple widescreen

300 × 250 – Inline rectangle (Most Common Google display ad size)

336 × 280 – Large rectangle (Most Common Google display ad size)

580 × 400 – Netboard

Skyscraper

120 × 600- size – Skyscraper (Most Common Google display ad size)

160 × 600- size – Wide skyscraper (Most Common Google display ad size)

300 × 600- size – Half-page ad

300 × 1050- size – Portrait

Leaderboard

468 × 60 size- Banner (Most Common Google display ad size)

728 × 90 size- Leaderboard (Most Common Google display ad size)

930 × 180 size – Top banner

970 × 90 size – Large leaderboard

970 × 250 size – Billboard

980 × 120 size – Panorama

Mobile

300 × 50- size – Mobile banner

320 × 50- size – Mobile banner

320 × 100 – size – Large mobile banner

In addition to that, you can also create animated ads. The accepted format for these is GIFs and they can be up to 30 seconds long.