Preview your Instagram post before it goes live

We could not find a page where Meta says how much of an Instagram caption the feed shows before “more”. The figure people quote is 125 characters: Sprout Social’s character counter page, published on 26 July 2021, says Instagram captions are truncated at 125 characters. That is a third-party number from five years ago, so treat it as a rough guide.

A fixed count can’t be right everywhere. A caption with line breaks uses up its visible lines quickly, emoji are wider than letters, and a long username starts the first line further along. So the tool lets you choose the cut yourself: after a number of lines (it starts at 2) or after a number of characters (it starts at 125), and labels both as approximate. Open your own feed, compare, and move the setting until the preview matches.

Tip: Whatever the exact cut, the first sentence is the part everyone sees. Put the hook, the offer or the comment keyword there and leave the detail for after “more”.

The header shows your profile photo and username, with a location under it if you add one. Below the picture come the action icons, the like count, the caption and a “View all comments” line. Every icon is drawn from scratch, there are no Instagram logos, and a strip at the bottom of the picture says it is a mock-up. Fonts come from your device, so the spacing is close, not identical.

The shapes and the 1,080 pixel width come from Instagram’s Help Center article on the resolution of photos you share, which says photos are kept at up to 1,080 pixels wide and that shapes from 1.91:1 to 3:4 are kept while others are cropped. Our Instagram post size guide cites it too. Meta’s IG User Media reference (last updated 28 September 2026, opened 7 October 2026) says an image published through the API must be within 4:5 to 1.91:1, and that a caption can hold at most 2,200 characters, which the counter above the caption box uses. The preview crops every slide to the chosen shape from the middle, and tells you how much of your image that cuts.

• Show a client or a teammate what a post will look like and where the caption breaks, without publishing it.
• Test two openings of the same caption: change the first line and watch what stays above “more”.
• Check a carousel’s first slide as a feed post. The first slide is what people see before they swipe.
• Put a comment keyword in the first line so it is not hidden. If you answer those comments with DMFast, a commenter gets a DM asking them to reply, and the link follows when they do; the preview shows the line they will read first.

The tool can’t show your real profile picture, your real like counts or how Instagram will treat the post. For that, check the post in the app itself before you share it.

• Sprout Social, social media character counter (sproutsocial.com/insights/social-media-character-counter), published 26 July 2021, opened 7 October 2026: says Instagram captions are truncated at 125 characters.
• Meta for Developers, IG User Media reference (developers.facebook.com/docs/instagram-platform/instagram-graph-api/reference/ig-user/media), updated 28 September 2026, opened 7 October 2026: a caption holds at most 2,200 characters, and an image published by API must be within 4:5 to 1.91:1.
• Instagram Help Center, image resolution of photos you share (help.instagram.com/1631821640426723), opened 7 October 2026: photos upload at up to 1,080 px wide, and shapes from 1.91:1 to 3:4 are kept while others are cropped.

We found no Meta page that gives the point where the feed cuts a caption, so the cut-off is a setting and the 2-line starting value is our estimate. The layout, fonts and spacing are ours, drawn to look like a feed, and are not copied from Instagram.