Why your captions are tanking your reach (even when the reel is strong)
The caption mistakes that signal "low value" to the algorithm.
Captions are doing more algorithmic work than most creators realize.
The Instagram algorithm reads captions. It analyzes them. It looks at length, language patterns, hashtag use, link presence, edit history. Then it uses what it finds to make decisions about distribution.
A great reel can be tanked by a bad caption. I see this in client accounts constantly.
The fix is understanding what the algorithm is reading for. There are four signals.
Free preview: two of them.
Signal 1: Caption length.
Instagram is currently favoring captions between 125 and 400 characters. Too short and the algorithm reads "low effort." Too long and the algorithm reads "trying to game the system." The sweet spot has shifted from the old "long captions win" advice to a tighter range.
If your captions are 30 words, lengthen them. If they're 300 words, cut them.
Signal 2: AI patterns.
Meta's classifiers are flagging AI-written captions. If your caption uses "in today's fast-paced world" or "let's dive into" or any of the AI tells most creators don't realize they're using, the algorithm reads it as inauthentic content and reduces reach.
If you've been using AI for captions, this is part of why your reach has dropped.
