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Profile Picture - 180 x 180 pixels (minimum)
displays 170 x 170 pixels on desktops & 128 x 128 pixels on smartphones
photo thumbnail will appear across Facebook at 32 x 32 pixels
Cover Photo - 820 x 462 pixels
displays at 820 x 462 on desktops and 640 x 360 pixels on smartphones
Shared Image - 1200 x 630 pixels
shared images include images that appear on your timeline, news feeds, followers’ feeds
will appear in feed at a max width of 470 pixels
will appear on a page at a max width of 504 pixels
Highlighted Image - 1200 x 717 pixels
highlighted images include milestones, highlighted images/posts
will appear on your page at 843 x 504 pixels
Event Event Cover Image - 1920 x 1080 pixels
Facebook Video- 1280 x 720 pixels
Facebook Group Cover Image - 1640 x 922 pixels
Facebook Ads - 1200 x 628 pixels
minimum width & height: 600 x 600 pixels
video ad size: 1280 x 720 pixels
story ad size: 1080 x 1920 pixels
Profile Photo - 110 x 110 pixels
Photo Thumbnails - 161 x 161 pixels
Photo Size - 1080 x 1080 pixels (square), 1080 x 566 pixels (landscape), 1080 x 1350 pixels (portrait)
appears on feed at 510 x 510 pixels
Instagram Stories - 1080 x 1920 pixels (ratio 9:16)
minimum resolution: 600 x 1067 pixels
Instagram Ad - 1080 x 566 pixels (landscape), 1080 x 1080 pixels (square)
Instagram IGTV - 1080 x 1920 pixels
Profile Photo - 400 x 400 pixels
displays as 200 x 200 pixels
Header Photo - 1500 x 500 pixels
Feed Image - 1024 x 512 pixels
Twitter Ad - 800 x 428 pixels
Video: 720 x 720 (square), 1280 x 720 (landscape), 720 x 1280 (portrait)
Profile Picture
165 x 165 pixels on home page
32 x 32 pixels on the rest of Pinterest
Pin Sizes
standard pin size 1000 x 1500 pixels (vertical images)
pins on boards appears at 236 pixels
Board Display
222 x 150 pixels for large thumbnails
55 x 55 for smaller thumbnails
Profile Photo - 200 x 200 pixels
Video - 1080 x 1920 pixels
Channel Profile Image - 800 x 800 pixels
displays as 98 x 98 pixels
Channel Cover Photo - 2560 x 1440 pixels
best for mobile and web = 1546 x 423 pixels
Video Uploads - 1280 x 720 pixels (to qualify for HD)
all videos must maintain 16:9 aspect ratio