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Accepted Media Formats

  • Postly makes it simple to upload and manage your content with support for a wide range of media formats.
  • Postly automatically optimizes and formats images to meet platform-specific requirements.
  • Images (uploaded via files or URLs) must not exceed the platform image size requirement.

Supported Image Formats

  • JPEG (.jpeg, .jpg)
  • PNG (.png)
  • BMP (.bmp)
  • TIFF (.tif, .tiff)
  • WebP (.webp)
  • SVG (.svg)
  • RAW formats (.raw, .cr2, .nef, .orf, .arw, .rw2)
  • ICO (.ico)
  • HEIC (.heic)

Supported Video Formats

  • MP4 (.mp4)
  • WebM (.webm)
  • MOV (.mov)
  • 1. TikTok Publishing

    1. TikTok Post: video up to 4GB and 10 mins – MP4-recommended, WebM, Mov and 1080 x 1920 px.
    2. Important Note: When posting on TikTok, the platform only displays the content written in the title field. Include all necessary details in the title.
  • 2. YouTube Publishing

    1. YouTube Post: video up to 10GB.
    2. YouTube Shorts are automatically published. Shorts can be up to 60 seconds in length. Videos must have a vertical orientation with a 9:16 aspect ratio.
    3. Add 1st comment to YouTube posts (also known as Description).
  • 3. Facebook Publishing

    1. Facebook First Comment: Publish the First Comment on Facebook posts.
    2. Multiple Images & Videos, Links.
    3. Facebook Carousel Post supports up to 10 images and image links.
    4. Facebook Stories Post supports up to 10 images.
    5. Supports Image and Video upload via Links.
    6. Note: You cannot publish images and videos at the same time on Facebook. If combined, only the video will be published.

    Facebook Image Types:

    1. The image must be less than 8MB in size. Format: JPEG, PNG, GIF.
    2. Image formats: PNG, JPEG, GIFs, etc. Up to 10 images per post.
    3. Aspect ratio: Must be within a 4:5 to 1.91:1 range.
    4. For full specifications, check this: Facebook Image specification.

    Facebook Video:

    1. Facebook video post: Max size 10GB. Max length 4 hours.

    Facebook Reels:

    1. Facebook Reels: Max size 10GB. Max length 90 secs. Format 1080 x 1920 px.

    Facebook Stories:

    1. Facebook Stories: Max size 10GB. Max length 60 secs. Format 1080 x 1920 px.
    2. Facebook Stories Carousel: Up to 10 images can be published.

    Facebook Carousel:

    1. Publish up to 10 images with associated links.
  • Threads

    4. Threads Publishing

    Threads Posts and Replies

    1. Text posts are limited to 500 characters.
    2. The API posts all replies after 15–30 seconds of publishing the main content.

    Threads Image Posts:

    1. Format: JPEG and PNG are supported.
    2. File Size: 8 MB maximum.
    3. Aspect Ratio Limit: 10:1.

    Threads Video Posts:

    1. File Size: 1 GB maximum.
    2. Duration: 300 seconds (5 minutes) maximum.
  • 5. Instagram Publishing

    Instagram First Comment:

    • Publish First Comment on Instagram posts.

    Instagram Collaborator:

      1. Inviting a Collaborator: Create your Instagram Feed post or Reel, search and tag collaborators (up to 3), then share the post.

      2. Accepting a Collab Request: Collaborators receive a notification and tap Accept to have the post appear on their profile.

    Instagram Image Post:

    • For full specification, check the link: Instagram Content Specification
    • Instagram Carousel Post with up to 10 images.
    • Format: Standard image formats accepted.
    • File Size: 8 MB maximum.

    Instagram Video Post:

    • Instagram Video Post: Max size 1GB, min length 3 secs, max length 15 mins. Format 1080 x 1080 px.

    Instagram Reels:

    • Instagram Reels: Max size 10GB, max length 90 secs. Format 1080 x 1920 px.

    Instagram Stories Image:

    • Format: Standard image formats accepted.
    • File Size: 8 MB maximum.

    Instagram Stories Video:

    • Instagram Stories Video: Max size 100MB, max length 60 secs. Format 1080 x 1920 px.
  • 6. Twitter Publishing

    • Twitter Post: video up to 512MB, min 0.5 secs, max 140 secs.
    • Images up to 5MB.
    • Up to 4 images per tweet; Threads: each tweet can contain 4 images.
    • Publish Single Tweets and Threads. Threads are automatically generated; user can edit on Preview page.
    • Publish Twitter Polls.
  • Bluesky

    7. Bluesky Publishing

    • Bluesky Post: text, images and videos.
    • Text content limit: 300 characters.
    • Tag users by adding their usernanme in the posts (e.g., @postlysocial.bsky.social).
    • Add hashtags.
  • 8. LinkedIn Publishing

    • LinkedIn Post: video up to 5GB.
    • Up to 9 images per post.
    • Images up to 5MB.
    • Publish Polls.
  • 9. Google Business Profile Publishing

    • Publish only one image at a time.
    • Video posts are not allowed due to API restrictions.
  • 10. Pinterest Publishing

    Publish Images and Videos.
    Supported media formats: MP4-recommended, WebM, Mov.

  • 11. Reddit Publishing

    • Publish Images and Videos.
    • Reddit will publish a post description message if only a text post is made.
    • If you make a text and image or video post, Reddit will remove the text and publish the image or video.
    • Supported media formats: MP4-recommended, WebM, Mov.
  • 12. Telegram Publishing

    • Publish Images (max 5MB) and Videos (max 20MB).
    • Up to 9 images per post.
    • Supported media formats: MP4-recommended, WebM, Mov.
    • Publish content via the default @postly_bot.
    • Publish content via a customized Telegram Bot.
  • 13. Blogger Publishing

    • Publish Text, Images and Videos.
    • Supported media formats: MP4-recommended, WebM, Mov.
  • 14. RSS Feed Publishing

    • Publish RSS Feed content.
  • 15. WordPress Publishing

    • Publish blog posts to wordpress.com and hosted WordPress sites.
  • 16. Recommended Post Lengths

    • Facebook:
    • Post Length: Ideal: 40–80 characters. Maximum: 63,206 characters.
    • Hashtags: Optimal: 1–2 hashtags. Maximum: Unlimited (best practice is to keep it minimal).
    • Instagram:
    • Post Length: Ideal: 138–150 characters. Maximum: 2,200 characters.
    • Hashtags: Optimal: 5–10 hashtags. Maximum: 30 hashtags per post.
    • For a comprehensive list, read our blog post: Comprehensive Guide to Post Lengths on Popular Social Media Platforms.

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