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
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
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
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
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
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
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
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
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
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
- 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.
- 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.
- 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).
- 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.
- 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
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
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
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
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