Free Tool
Social media character limit checker
Paste your post text and instantly see whether it fits Instagram, TikTok, LinkedIn, Facebook, YouTube, Threads, and Reddit — including hashtag limits.
Instagram
2,200
Caption
TikTok
2,200
Caption
LinkedIn
3,000
Post text
Facebook
63,206
Post text
YouTube
5,000
Description
Threads
500
Post text
Reddit
40,000 / 300
Body / Title
0 characters0 hashtags0 words
Start typing above to see results for each major platform
Post to Instagram, Facebook, Threads, TikTok, LinkedIn, YouTube, and Google Business from one API call
Aether automatically validates character limits, hashtag counts, and platform rules before publishing. Platform-specific overrides let you tailor caption text per platform without maintaining 7 separate integrations.
Rate limit reference →
Post frequency limits, API quotas, and reset windows per platform API (connect availability varies)
Scheduling API →
Schedule posts to any platform with timezone support and queue management
Rate limiting explained →
How fixed-window and token-bucket algorithms work, and how to handle 429s