Social Media Format Guide

Optimize your content with Postly's seamless support for platform-specific media formats. Automatically adapt images, videos, and text to meet each platform's requirements, with premium plans offering unmatched upload capabilities.

Important Notes:

1. Platform-Specific Requirements: Postly ensures compliance with each platform's unique media specifications, including aspect ratios and file sizes.

2. API-Driven Specs: Media formats are governed by platform APIs, which may differ from native app capabilities.

3. Multi-platform Publishing: We do the grunt work of image auto-fixing, video validation, and general content processing to ensure your content is successfully published on all platforms. If we detect issues we can't auto-resolve, you'll be notified immediately with guidance.

TikTok Publishing

Video Specs

• Max size: 4GB

• Duration: Up to 10 minutes

• Formats: MP4, MOV, WebM

• Resolution: 1080x1920px (9:16)

• Frame rate: 23.976–60 fps

• Premium plans: Unlimited high-quality uploads

Text Specs

• Caption: 150 characters max

• Only the Title is displayed in feed

Image Specs

• We don't support direct posting of images at the moment

TikTok prioritizes vertical video content. Ensure videos meet aspect ratio and resolution requirements for optimal performance.

YouTube Publishing

Video Specs

• Max size: 128GB

• Duration: Up to 12 hours

• Formats: MP4, MOV, AVI, WMV, MPEGPS, FLV, 3GPP, WebM

• Resolution: 240p to 4K (recommended 1080p or higher)

• Aspect ratio: 16:9 (standard), 9:16 (Shorts)

• Frame rate: 24–60 fps

• Premium plans: No throttling for long-form content

Text Specs

• Title: 100 characters max

• Description: 5,000 characters max

• Tags: 500 characters total

• First comment support in description

Image Specs

• Thumbnail: 1280x720px, 2MB max

• Formats: JPG, PNG, BMP, GIF

Shorts Specs

• Duration: Up to 60 seconds

• Resolution: 1080x1920px (9:16)

• Auto-published as Shorts if criteria met

YouTube supports a wide range of video formats. Use high-resolution thumbnails for better engagement.

Facebook Publishing

Image Specs

• Max size: 8MB

• Formats: JPEG, PNG, GIF

• Resolution: 1080x1080px (recommended)

• Carousels: Up to 10 images

• Stories: 1080x1920px (9:16)

Video Specs

• Max size: 10GB

• Duration: Up to 4 hours

• Formats: MP4, MOV

• Resolution: 1080p (recommended)

• Aspect ratio: 16:9, 1:1, 4:5, 9:16

• Frame rate: 30 fps max

• Premium plans: High-quality uploads without limits

Reels Specs

• Max size: 4GB

• Duration: Up to 90 seconds

• Resolution: 1080x1920px (9:16)

• Formats: MP4, MOV

Stories Specs

• Max size: 4GB

• Duration: Up to 60 seconds

• Resolution: 1080x1920px (9:16)

• Formats: MP4, MOV

Text Specs

• Post: 63,206 characters max

• Stories: Limited text overlay support

Cannot mix images and videos in the same post. Reels and Stories require vertical formats.

Threads Publishing

Text Specs

• Max length: 500 characters

• Replies delayed 15–30 seconds

Image Specs

• Max size: 8MB

• Formats: JPEG, PNG

• Resolution: 1080x1080px (recommended)

• Up to 10 images per post

Video Specs

• Max size: 1GB

• Duration: Up to 5 minutes

• Formats: MP4, MOV

• Resolution: 1080x1920px (recommended)

• Premium plans: Enhanced video upload capacity

Threads supports limited media types. Ensure content aligns with platform guidelines.

Instagram Publishing

Image Specs

• Max size: 8MB

• Formats: JPEG, PNG

• Resolution: 1080x1080px (1:1), 1080x1350px (4:5), 1080x1920px (9:16)

• Carousels: Up to 10 images

Video Post Specs

• Max size: 4GB

• Duration: 3 seconds to 15 minutes

• Formats: MP4, MOV

• Resolution: 1080x1080px (1:1)

• Frame rate: 23–60 fps

• Premium plans: Seamless high-quality uploads

Reels Specs

• Max size: 4GB

• Duration: Up to 90 seconds

• Formats: MP4, MOV

• Resolution: 1080x1920px (9:16)

• Frame rate: 23–60 fps

Stories Specs

• Max size: 100MB

• Duration: Up to 60 seconds

• Formats: MP4, MOV

• Resolution: 1080x1920px (9:16)

• Frame rate: 23–60 fps

Text Specs

• Caption: 2,200 characters max

• Hashtags: Up to 30

• Stories: Limited text overlay support

Instagram enforces strict aspect ratios for Reels and Stories. Optimize media for vertical display.

Twitter Publishing

Image Specs

• Max size: 5MB

• Formats: JPEG, PNG, GIF

• Resolution: 1200x675px (recommended)

• Up to 4 images per post

Video Specs

• Max size: 512MB

• Duration: Up to 140 seconds

• Formats: MP4, MOV

• Resolution: 1280x720px (recommended)

• Frame rate: 24–60 fps

• Premium plans: Optimized video uploads

Text Specs

• Max length: 280 characters

• Thread support

• Poll creation

Twitter’s API enforces strict media limits. Premium plans enhance video upload capabilities.

LinkedIn Publishing

Image Specs

• Max size: 8MB

• Formats: JPEG, PNG, GIF

• Resolution: 1200x627px (recommended)

• Up to 9 images per post

Video Specs

• Max size: 5GB

• Duration: 3 seconds to 10 minutes

• Formats: MP4

• Resolution: 1080p (recommended)

• Frame rate: 23–60 fps

Text Specs

• Post: 3,000 characters max

• Article: 125,000 characters max

• Poll support

LinkedIn prioritizes professional content. Ensure media aligns with platform guidelines.

Google Business Profile

Image Specs

• Max size: 5MB

• Formats: JPEG, PNG

• Resolution: 720x720px (minimum)

• One image at a time

Video Specs

• Not supported via API

Text Specs

• Post: 1,500 characters max

Google Business Profile has limited API support for media. Use native options for videos.

Pinterest Publishing

Image Specs

• Max size: 32MB

• Formats: JPEG, PNG

• Resolution: 1000x1500px (recommended, 2:3)

• Aspect ratio: 2:3 or 1:1

Video Specs

• Max size: 2GB

• Duration: 4 seconds to 15 minutes

• Formats: MP4, MOV

• Resolution: 1080x1920px (recommended, 9:16)

• Frame rate: 24–60 fps

• Premium plans: Enhanced video upload limits

Text Specs

• Title: 100 characters max

• Description: 500 characters max

Pinterest Pins require high-quality, vertical visuals for optimal engagement.

Reddit Publishing

Image Specs

• Max size: 5MB

• Formats: JPEG, PNG

• Resolution: 1080x1080px (recommended)

Video Specs

• Max size: 1GB

• Duration: Up to 15 minutes

• Formats: MP4, MOV

• Resolution: 1080p (recommended)

• Premium plans: High-quality video support

Text Specs

• Title: 300 characters max

• Text with media ignored via API

Reddit's publishing flow is distinct compared to other social platforms. Their API strictly separates media posts (images, videos, or links) from text posts. This means:
  • If you attach an image, video, or link, any text or message will be discarded. Reddit renders only the media and the post title.
  • If you want to include a descriptive message or call-to-action, choose a text-only post, and embed your media (e.g., image URL or link) directly inside the post body.
  • Reddit does not allow hybrid media + message posts unless published manually through the web interface. This is an API limitation.
Handling Multiple Reddit Accounts:
Reddit enforces session-based authentication, meaning only one account can be connected per browser session. To add multiple Reddit accounts to Postly:
  • If you need to log in to multiple Reddit accounts, use different browsers (e.g., Chrome, Firefox, Edge) to log in to additional accounts.
  • Once connected in Postly, accounts remain active and don't require repeated login.
Profile vs Community Posting:
Postly supports posting to both user profiles and subreddits you moderate. If you're posting to a subreddit, make sure:
  • You are a moderator with posting permissions.
  • The subreddit allows the type of content you're publishing (e.g., some subreddits restrict link or video posts).
Technical Notes:
  • Reddit has strict API rate limits. If you're posting in bulk across multiple communities, allow a short delay between actions to avoid throttling.
  • Post previews in Postly may differ slightly from Reddit's final rendering. Always test across different post types.
  • We use Reddit's official API for all integrations — secure, up-to-date, and in compliance with platform rules.
Tip: For posts that require both visuals and commentary, use a text post format and embed media links directly into the body content. This ensures your message is retained.
How do I set up Mod Approval for every Reddit post?
  • Set your community's spam filter level to all in Mod Tools > Posts & Comments > Spam filter strength. Refer to Reddit's Mod Approval for details.

Telegram Publishing

Image Specs

• Max size: 10MB

• Formats: JPEG, PNG

• Resolution: 1080x1080px (recommended)

• Up to 9 images per post

Video Specs

• Max size: 20MB

• Duration: Up to 60 seconds

• Formats: MP4, MOV

• Resolution: 1080p (recommended)

Text Specs

• Caption: 4,096 characters max

• Custom bot support

Telegram supports bot-driven publishing. Configure bot permissions correctly.

Blogger Publishing

Image Specs

• Max size: 15MB

• Formats: JPEG, PNG, GIF

• Resolution: 1600x900px (recommended)

Video Specs

• Max size: 100MB

• Formats: MP4, MOV, AVI

• Resolution: 1080p (recommended)

• Premium plans: High-quality video uploads

Text Specs

• No strict character limit

• Supports HTML formatting

Blogger supports rich media content. Ensure video sizes comply with platform limits.

RSS Feed Publishing

Text Specs

• Title: 255 characters max

• Description: No strict limit

• Supports HTML

Media Specs

• Images: JPEG, PNG (via enclosure)

• Videos: MP4 (via enclosure)

• No strict size limits

RSS feeds require valid feed URLs for automatic publishing.

WordPress Publishing

Image Specs

• Max size: 25MB

• Formats: JPEG, PNG, GIF

• Resolution: 1920x1080px (recommended)

Video Specs

• Max size: 100MB

• Formats: MP4, MOV

• Resolution: 1080p (recommended)

• Premium plans: Enhanced video integration

Text Specs

• No strict character limit

• Supports HTML and categories/tags

WordPress supports self-hosted sites. Ensure API access is configured.

Bluesky Publishing

Image Specs

• Max size: 1MB

• Formats: JPEG, PNG

• Resolution: 1080x1080px (recommended)

• Up to 4 images per post

Video Specs

• Max size: 50MB

• Duration: Up to 60 seconds

• Formats: MP4

• Resolution: 1080p (recommended)

• 25 uploads per day

Text Specs

• Max length: 300 characters

• Supports user tagging

Bluesky enforces strict daily upload limits. Plan content accordingly.
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