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 all 7 platforms
Post to all 7 platforms 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.