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Last updated: 2026/5/29

Content you can post

Supported Social Platforms
X (Twitter)InstagramThreadsFacebook
Supported Plans
FreePersonalProfessionalBusinessEnterprise

This section describes the types of content that can be posted on each social media platform, along with their image and video file formats and size limitations.

Submitting content in formats other than those specified may result in an error. Even if images and videos are created in the specified formats and sizes, social media platforms may convert or compress the formats, which can lead to a decrease in image quality.

All Social Media Platforms​

Text​

  • Emojis can be used.

X (formerly Twitter)​

Text​

  • Posts up to 140 characters
  • Long-form posts over 140 characters
    • Japanese: up to 12,500 characters
    • English: up to 25,000 characters
    • Only available to X Premium (formerly Twitter Blue) subscribers.

Images​

  • Formats: JPG, PNG, GIF, WebP, BMP
    • If a WebP image exceeding 5MB is uploaded, SocialDog will compress and convert it to JPEG format.
    • BMP images will be converted to JPEG format.
  • Size: Up to 5MB (per image)
    • If the browser supports image compression, images exceeding this size will be automatically compressed to a postable size.
  • Up to 4 images can be attached.

Animated GIFs​

  • Format: GIF
  • Size: Up to 15MB
  • Resolution: 1280x1080 or less
  • Frame Count: 350 or less
  • Pixel Count (product of height, width, and frame count): Up to 300 million

Videos​

  • Size: Up to 512MB

Recommended video formats published by X (formerly Twitter) are as follows:

Recommendations​

  • Recommended Video Codec: H264 High Profile
  • Recommended Frame Rate: 30 FPS, 60 FPS
  • Recommended Video Resolution: 1280x720 (landscape), 720x1280 (portrait), 720x720 (square)
  • Recommended Minimum Video Bitrate: 5,000kbps
  • Recommended Minimum Audio Bitrate: 128kbps
  • Recommended Audio Codec: AAC LC
  • Recommended Aspect Ratio: 16:9 (landscape or portrait), 1:1 (square)

Advanced Specifications​

  • Frame Rate: 60 FPS or less
  • Dimensions: 32x32 to 1280x1024
  • File Size: Up to 512MB
  • Playback Duration: 0.5 to 140 seconds
  • Aspect Ratio: 1:3 to 3:1
  • Pixel Aspect Ratio is 1:1
  • Supports only YUV 4:2:0 pixel format
  • Audio
  • Do not include Open GOP
  • Always use progressive scan

Threads (Tree format)​

Polls​

Voting duration can also be set.

Accounts that can reply​

The following can be set:

  • Everyone
  • Accounts you follow
  • Verified Accounts
  • Accounts you @mentioned in the post

Daily Post Limit​

  • Verified Accounts (X Premium subscribers): 2,400 posts
  • Unverified Accounts: 50 standard posts / 200 replies

Unsupported Content​

  • Bold/italic text
  • Post-submission editing

Instagram​

On Instagram, the formats for images and videos that can be posted differ between Feed/Reel posts and Stories posts.

Feed & Reels​

If one video is attached, it will be posted as a Reel.

Text​

  • Up to 2,200 characters
    • For Reels: Up to 733 characters for Japanese

Images​

  • Formats: JPEG, PNG, WebP, BMP
    • If an image in a format other than JPEG is uploaded, it will be converted to JPEG format.
  • Size: Up to 8MB
    • Images exceeding this size cannot be uploaded.
    • Images posted to Instagram are not compressed by SocialDog.
  • Aspect Ratio: Ranging from 4:5 to 1.91:1
  • Up to 10 images can be attached.

Videos​

  • Formats: MP4, MOV, QuickTime
  • Size: Up to 300MB
  • Video Length:
    • Feed: 3 to 90 seconds
    • Reels: 3 seconds to 15 minutes
  • Aspect Ratio: 4:5 to 16:9
  • Audio: 1 or 2 channels (mono or stereo)

Stories​

Mentions​

Images​

  • Formats: JPEG, PNG
    • If an image in a format other than JPEG is uploaded, it will be converted to JPEG format.
  • Size: Up to 8MB
    • Images exceeding this size cannot be uploaded.
    • Images posted to Instagram are not compressed by SocialDog.
  • Aspect Ratio: 9:16 (recommended)
    • If media with an aspect ratio different from the recommended 9:16 is posted, Instagram may add borders or crop parts of the image.

Videos​

  • Formats: MP4, MOV
  • Size: Up to 100MB
  • Video Length: 3 to 60 seconds
  • Aspect Ratio: 9:16 (recommended)
    • If media with an aspect ratio different from the recommended 9:16 is posted, Instagram may add borders or crop parts of the video.
  • Audio: AAC, up to 2 channels

Unsupported Content​

  • Stories & Reels
    • Adding music
    • Adding text
    • Adding stickers (polls, questions, emojis, links, hashtags, mentions, locations)
    • Simultaneous posting to multiple social media accounts
  • Reels
    • Specifying cover (thumbnail)

Daily Post Limit​

100 posts

Facebook​

Text​

  • Up to 60,000 characters

Images​

  • Formats: JPEG, PNG, WebP, BMP, TIFF
    • WebP images will be converted to JPEG format.
    • If a BMP image exceeding 4MB is uploaded, SocialDog will compress and convert it to JPEG format.
  • Size: Up to 4MB (up to 1MB for PNG)
    • If the browser supports image compression, images exceeding this size will be automatically compressed to a postable size. However, TIFF images cannot be compressed.
  • Up to 10 images can be attached.

Videos​

  • Size: Up to 100MB
  • Formats: MP4, MOV, GIF
  • Aspect Ratio: Ranging from 9:16 to 16:9

Threads​

Text​

  • Posts up to 500 characters are allowed.

Images​

  • Formats: JPEG, PNG
  • Size: Up to 8MB (per image)
  • Maximum number of images per post: 20
  • Aspect Ratio: Ranging from 0.01:1 to 10:1
  • Color Space: sRGB (Images using other color spaces will be converted to sRGB)

Videos​

  • Formats: MOV or MP4
  • Size: Up to 1GB
  • Length: Up to 300 seconds
  • Audio: AAC, maximum sample rate 48 kHz, 1 or 2 channels (mono or stereo)
  • Video Codec: HEVC or H264

Daily Post Limit​

250 posts