LinkedIn
Image:
Images with less than 36152320 pixels
JPG, GIF, and PNG formats
GIF format supports up to 250 frames
Vid:
200mb
Twitter
Image:
Supported image media types: JPG, PNG, GIF, WEBP
Image size <= 5 MB, animated GIF size <= 15 MB
GIF: Number of frames <= 350
Vid:
File size must not exceed 512mb
Duration must be between 0.5 seconds and 140 seconds
Aspect ratio must be between 1:3 and 3:1
Recommended Frame Rates: 30 FPS, 60 FPS
Recommended Video Resolution: 1280x720 (landscape), 720x1280 (portrait), 720x720 (square)
Facebook
Image:
The minimum allowed image dimension is 200 x 200 pixels.
The size of the image file must not exceed 8 MB.
Use images that are at least 1200 x 630 pixels for the best display on high resolution devices. At the minimum, you should use images that are 600 x 315 pixels to display link page posts with larger images.
Vid:
Aspect Ratio: 9x16, 16x9
Image:
Format: JPEG
File size: 8 MB maximum.
Aspect ratio: Must be within a 4:5 to 1.91:1 range
Minimum width: 320 (will be scaled up to the minimum if necessary)
Maximum width: 1440 (will be scaled down to the maximum if necessary)
Height: Varies, depending on width and aspect ratio
Color Space: sRGB. Images using other color spaces will have their color spaces converted to sRGB.
Vid:
Container: MOV or MP4 (MPEG-4 Part 14), no edit lists, moov atom at the front of the file.
Audio codec: AAC, 48khz sample rate maximum, 1 or 2 channels (mono or stereo).
Video codec: HEVC or H264, progressive scan, closed GOP, 4:2:0 chroma subsampling.
Frame rate: 23-60 FPS.
Picture size:
Maximum columns (horizontal pixels): 1920
Minimum aspect ratio [cols / rows]: 4 / 5
Maximum aspect ratio [cols / rows]: 16 / 9
Video bitrate: VBR, 5Mbps maximum
Audio bitrate: 128kbps
Duration: 60 seconds maximum, 3 seconds minimum
File size: 100MB maximum