Instagram post preview
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Shows a post with its 4:5 image and the caption cut where Instagram cuts it — around 125 characters, after which everything is behind "more".
How to use the instagram post preview
The caption fold is the whole reason to preview a post. A caption can run to 2,200 characters, but only about the first 125 are read without a deliberate tap, so a post that opens with a greeting and gets to the point in the third line is throwing away its own first sentence. Line breaks count against the fold too, which is why a caption formatted with a blank line after the first sentence loses more of it than the character count suggests. Hashtags placed at the top consume the fold entirely, which is the argument for putting them at the end or in the first comment.
Questions
About 125 characters before "more". The full limit is 2,200 but almost nobody taps.
Yes, they are characters and they consume the fold faster than words do.
At the end or in the first comment. At the top they eat the visible part of the caption.
No, and it cannot be. Platforms cut by rendered pixel width, so a title in capitals or wide letters cuts earlier than a character count suggests. Treat the limit as a guide and leave a few characters of margin.
4:5 portrait, which uses the most feed height.