Here are the image and video specifications for Facebook and YouTube ads:

Facebook:

Facebook Reach Ads - Static Image:

• File Type: JPG or PNG
• Ratio: 1.91:1 to 1:1
• Resolution: At least 1080 x 1080 pixels

Facebook Reach Ads - Carousel:

• Image File Type: JPG or PNG
• Video File Type: MP4 or MOV
• Ratio: 1:1
• 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

Facebook Reach Ads - Video:

• File Type: MP4 or MOV
• 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
• Video Duration: 1 second to 241 minutes
• Maximum File Size: 4GB
• Minimum Width: 120 pixels
• Minimum Height: 120 pixels

For more info on Facebook ad formats, follow this link.

YouTube:

YouTube Bumper Ads:

• Height: 360 px
• Width: 480 px or 640 px for aspect ratios of 4:3 and 16:9, respectively
• Supported Formats: AVI, ASF, MOV, MP4, MPEG
• Maximum File Size: 1 GB

For more info on YouTube ad formats, follow this link.