The reason captions are hard is that they are doing two jobs at once. They have to be short enough to be read on a phone, and they have to say something rather than filling space. Most of the time people spend on captions is really time spent avoiding the second problem.
Start from a topic, not a template
The useful way to think about a caption is that it is a sentence with a point. Most weak captions are weak because they describe the post instead of adding to it. “Another day at the gym” tells the reader nothing they cannot see from the picture. “Leg day, and I was wrong about the weights” gives them a reason to keep reading.
Generated captions work best when you treat them as that first sentence rather than as the finished thing. Take the angle, write it in your own words, and add the detail only you have.
What actually performs
The captions that work tend to do one of a few things. They name something specific rather than something general. They ask a question worth answering. Or they make a claim the reader might disagree with, which is uncomfortable but effective because disagreement gets a response.
Length helps more than people expect, because most people stop reading at the first line. Writing three or four lines means the interesting part can land on the second or third rather than being front-loaded into a space that gets truncated.
Emojis, used deliberately
Emojis work when they carry meaning rather than decorating. One at the end of a line works as a full stop you did not have to type. A row of fifteen between every sentence does the opposite and makes the text harder to scan on a small screen.
The exception is when the emoji is the content, particularly for food, travel and fitness, where a single relevant emoji says more than a paragraph.
Do not post them unchanged
This is the important caveat. A caption with no specific detail in it performs badly because it tells the audience nothing, and the reason it feels thin is that no detail was available. Generated captions describe a category of post rather than your actual post.
Two minutes of editing is what turns a usable starting point into a caption that sounds like you. Without it you are posting something generic and it will show.
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Adapting one caption to several platforms
The same words rarely work everywhere, because the platforms reward different things and punish different habits. Instagram rewards length and rewards a strong first line, since a caption can be as long as you like and the first line is all that shows before someone taps through.
TikTok is the opposite. A long caption is largely ignored, so the caption there does a different job: it is a short searchable sentence describing the video, useful because TikTok is used like a search engine far more than Instagram is.
LinkedIn rewards plain professional language and punishes anything that reads like a marketing caption, so the same enthusiasm that works on Instagram makes a post perform badly there. What works instead is a straight account of something you did and what you learned from it.
Writing each one separately is the only way to get this right, and it takes about ten minutes when you have already worked out the point of the post. Rewriting a caption to fit a platform is much faster than writing four captions and much faster than watching one of them underperform.
The practical habit worth keeping is to decide the single point before writing anything, then express it four ways. Posts that work usually have one clear idea, and captions that flounder are usually trying to carry three at once.