Here in one place is all the ad specs, enjoy!:
Ad Specs:
File Type: JPG or PNG
Ratio: 1.91:1 to 1:1
Resolution: At least 1080 x 1080 pixels
Maximum File Size: 30MB
Minimum Width: 600 pixels
Minimum Height: 600 pixels
File Type: MP4, MOV or GIF
Ratio: 1:1 (for desktop or mobile) or 4:5 (for mobile only)
Video Settings: H.264 compression, square pixels, fixed frame rate, progressive scan and stereo AAC audio compression at 128kbps+
Resolution: At least 1080 x 1080 pixels
Image File Type: JPG or PNG
Video File Type: MP4, MOV or GIF
Ratio: 1:1 or 4:5
Resolution: At least 1080 x 1080 pixels
Number of Carousel Cards: 2 to 10
Image Maximum File Size: 30MB
Video Maximum File Size: 4GB
Video Duration: 1 second to 240 minutes
Google Display: Two main types of ads direct uploaded ads and responsive display ads:
Direct uploaded non-animated and animated (GIF) ads, see link here under the heading animated & non animated image ads. Notes:
Max file size must be less than 150 kb.
Of all of the 20+ sizes, the top 10 sizes are:
Square: 250×250
Half Page: 300×600
Large Rectangle: 336×280
Leaderboard: 728 × 90
Small Square: 200 × 200
Banner: 468 × 60
Inline Rectangle: 300 × 250
Skyscraper: 120 × 600
Wide Skyscraper: 160 × 600
Large Leaderboard: 970 × 90
Responsive display ads. Responsive display ads allow reaching all ad sizes using just two image sizes, rectangle and square plus a logo. Google will rearrange the ad to fit all sizes. Specs:
Landscape
1.91:1 1200 x 628 pixels
(min 600 x 314 pixels) 1-15 images
Recommended: 5 ✓
Logo
1:1 1200 x 1200 pixels
(min 128 x 128 pixels) 1-5 images
Recommended: 1 ✓
Logo
4:1 1200 x 300 pixels
(min 512 x 128 pixels) 1-5 images
Recommended: 1 ✕
Square
1:1 600 x 600 pixels
(min 300 x 300 pixels) 1-15 images
Recommended: 5
Responsive display ads:
Skippable ads:
Recommended video dimensions: 426 x 240 (240p), 640 x 360 (360p), 854 x 480 (480p),1280 x 720 (720p), 1920 x 1080 (1080p), 2560 x 1440 (1440p) and 3840 x 2160 (2160p)
Minimum dimensions: 426 x 240
Maximum dimensions: 3840 x 2160
Aspect ratio: 16:9
Maximum file size: 128GB or 12 hours, whichever is less
Accepted video formats: .MOV, .MPEG4, MP4, .AVI, .WMV, .FLV, 3GPP, and WebM
The skippable video length max is 6 minutes (skippable after 5 seconds)
Nonskippable ads:
Same as above but less than 15 seconds.
Bumper ads: 6 seconds or shorter, playing before, during, or after another video.
As an advertiser, you can choose when these videos appear. Plus, viewers don't have the option to skip the ad.
Remember: A 300 x 60 image will run with your video ad. Make sure your creative team delivers both your video and image assets.Recommended video dimensions: 426 x 240 (240p), 640 x 360 (360p), 854 x 480 (480p),1280 x 720 (720p), 1920 x 1080 (1080p), 2560 x 1440 (1440p) and 3840 x 2160 (2160p)
Minimum dimensions: 426 x 240, Maximum dimensions: 3840 x 2160
Aspect ratio: 16:9
Maximum file size: 128GB or 12 hours, whichever is lessAccepted video formats: .MOV, .MPEG4, MP4, .AVI, .WMV, .FLV, 3GPP, and WebM
The skippable video length max is 6 minutes (skippable after 5 seconds)
The recommended aspect ratio is 9:16, 1:1, or 16:9.
Resolution options include 720 x 1280 px, 640 x 640 px, and 1280 x 720 px.
You can use MP4, MPEG, MOV, or AVI files in your ads.
Video duration should be between 9 and 15 seconds.
The video file size should be less than 500 MB.