Channel limits and formats
Caption limits, media rules, per-channel fields and design sizes for Instagram, Facebook, LinkedIn and YouTube.
Updated November 10, 2026
Use this page to check what each channel accepts before you schedule a post. The composer checks these rules for you and shows an error when a post breaks one.
Business or creator accounts. Captions up to 2,200 characters, with up to 30 hashtags and 20 mentions.
Post / carousel: up to 20 images or videos. Media is required.
Reel: one video, 3 seconds to 15 minutes.
Story: one image or video, video 3 to 60 seconds. No caption. Stories disappear after 24 hours.
Extra fields: Collaborators (up to 3, who must accept on Instagram), Location, Tag people (up to 20), Alt text (up to 1,000 characters), First comment (up to 2,200 characters). Reels also have a cover image or frame, Also show in the feed, and trial reel options.
Pages. Captions up to 63,206 characters.
Post: up to 10 images, or one video. Media is optional.
Reel: one video, 3 to 90 seconds. Up to 30 reels per Page in 24 hours.
Story: one image or video, video 3 to 60 seconds. No caption.
Extra fields: Location, First comment (up to 8,000 characters), Reel title (up to 255 characters).
Company pages. Captions up to 3,000 characters.
Post: up to 20 images, or one video (3 seconds to 30 minutes), or one document. Media is optional.
Extra fields: Document title (required for a document, up to 400 characters), Alt text (up to 4,086 characters), First comment (up to 1,250 characters).
YouTube
Channels. Descriptions up to 5,000 characters. YouTube may keep uploads private until Praisma's app passes Google's API audit; you can make them public in YouTube Studio.
Video: one video.
Short: one vertical video, up to 3 minutes.
Fields: Title (required, up to 100 characters), Visibility (Public, Unlisted or Private), Is this video made for kids? (required), Altered or synthetic content, Category, Tags (500 characters in total), Add to playlist, and Custom thumbnail for videos (needs a verified channel; JPG or PNG, 1280×720, under 2 MB). More options include Notify subscribers, License and Allow embedding.
Comments and messages
Instagram: reply, hide or delete comments. Direct messages. Replies up to 2,200 characters.
Facebook: reply, hide, delete or like comments. Direct messages. Replies up to 8,000 characters.
LinkedIn: reply, delete or like comments. No direct messages. Replies up to 1,250 characters.
YouTube: reply, hide or delete comments. No direct messages. Replies up to 10,000 characters.
Instagram and Facebook accept a reply to a direct message for 24 hours after the customer's last message. A person on your team can still reply for up to 7 days. See The inbox.
Design sizes
These format sizes are available in the Praisma Editor, in pixels (width × height).
Instagram: Post 1080×1080, Portrait 1080×1350, Story 1080×1920, Landscape 1080×566.
Facebook: Post 1200×628, Portrait 1080×1350, Square 1080×1080, Story 1080×1920, Cover 820×312.
LinkedIn: Post 1200×627, Portrait 1080×1350, Story 1080×1920.
YouTube: Thumbnail 1280×720, Shorts 1080×1920.
TikTok
Accounts: personal and business.
Video: one file, at least 3 seconds, caption up to 2,200 characters.
Photo post: up to 35 images, caption up to 4,000 characters, title up to 90 characters.
Fields: who can view the post (required), comments, Duet and Stitch, commercial disclosure and AI-generated content.
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