Reference

Platform limits: captions, titles, covers, video

Caption and title limits for all twelve platforms, which ones take a custom video cover, and the video ceiling that applies everywhere. Read from the product config.

Twelve platforms, twelve sets of limits. The composer enforces these as you type, so you find out before a post is scheduled rather than after it fails. The numbers below are read straight from the same configuration the publisher uses.

Caption and title limits

Platform	Caption limit	Title limit
Instagram	2,200 characters	No title
Facebook	63,206 characters	No title
TikTok	2,200 characters	90 characters
YouTube	5,000 characters	100 characters
LinkedIn	3,000 characters	No title
X	280 characters	No title
Pinterest	800 characters	100 characters
Threads	500 characters	No title
Bluesky	300 characters	No title
Mastodon	500 characters	No title
Telegram	4,096 characters (1,024 with media)	No title
Google Business Profile	1,500 characters	No title

Mastodon's limit belongs to your server

Mastodon is federated and each server sets its own cap. 500 is only the common default; some servers allow 1,000 or more. Schedchie reads the real number from your instance when you connect and counts against that, so the figure in your composer may be higher than the one here.

The limit counts your hashtags too

Caption limits are measured across the text and the hashtags together, the way the platform counts them. A 280-character X post with six hashtags has fewer than 280 characters of sentence in it.

Titles exist on YouTube and Pinterest only. On the rest, the caption is the whole post. In a CSV import, the title column feeds exactly those two.

Video, everywhere

Limit	Value
Maximum file size	200 MB
Maximum duration	15 minutes

These apply on every platform, not per platform. Anything over them is stopped before it enters the queue rather than failing at publish time. Video uploads run in the background over a resumable connection, so a large file does not lock the composer.

Each platform adds its own rules per post type: a Reel and a long-form upload differ on Instagram. When a platform refuses a file, its reason is shown on the post; see why a post failed.

Post types, covers and alt text

Platform	Post types	Video cover	Alt text
Instagram	Reel, feed post, carousel, Story	Upload one, or pick a frame	No
Facebook	Text, image, video, Reel, link, carousel	Upload one, or pick a frame	No
TikTok	Video, photo post	Pick a frame, or upload one on accounts connected through TikTok’s business sign-in	No
YouTube	Video (Shorts by format)	Upload one, or pick a frame	No
LinkedIn	Text, image, video, link, article, poll, document	Upload one	Yes, on images
X	Text, image, video. Posting to X is a €4.99 add-on per 30 posts.	Set by the platform	No
Pinterest	Image and video pins	Upload one, or pick a frame	Yes
Threads	Text, image, video, carousel	Set by the platform	No
Bluesky	Text, image, video	Set by the platform	Yes, on images
Mastodon	Text, image, video, poll	Set by the platform	Yes, on images
Telegram	Text, photo, video, album	Set by the platform	No
Google Business Profile	What’s New, Event, Offer (photos only)	No video	No

Reading the cover column

Upload one: attach your own image as the cover or thumbnail.
Pick a frame: scrub the video and choose the frame to freeze on.
Set by the platform: Threads, Bluesky, Mastodon, Telegram and X generate the still themselves, and Schedchie leaves the still to the platform.

Pinterest video pins require a cover, so one is always set. Everywhere else it is optional and falls back to the platform default.

Images

Instagram is the one platform with an aspect-ratio rule: images must sit between 0.8 and 1.91, roughly 4:5 portrait through 1.91:1 landscape. Schedchie warns in the composer and pads out-of-ratio images automatically (blurred edges, never cropped) so the post still publishes. That happens only on Instagram; other platforms get the file exactly as you uploaded it.

Alt text is offered on LinkedIn, Pinterest, Bluesky and Mastodon, where Schedchie sends it with a scheduled post.

What each platform can do beyond the numbers (the settings, the extras, the connection details) is on its own page: Instagram, Facebook, TikTok, YouTube, LinkedIn, X, Pinterest, Threads, Bluesky, Mastodon, Telegram, Google Business Profile.

Write to support

Write with the account name and the post’s scheduled time, and a person writes back about that post.

support@schedchie.com

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