Threads post size: 1080 x 1350 and square images

The best Threads post size is 1080×1350 pixels, a 4:5 portrait frame, the same as an Instagram portrait post. Square images at 1080×1080 work just as well when the content suits a square. Threads displays images at their own proportions rather than cropping them to one shape, so a portrait image simply takes up more of the feed. If you already design for Instagram, your existing posts fit Threads without a single change.

Threads image sizes

Export PNG for text and flat colour, high quality JPEG for photos, and keep files in sRGB. Gradients and fine type suffer most from the app's compression, and a little grain on a gradient helps it survive, as explained in gradient banding.

How Threads carousels display

Attach more than one image and Threads lays them out in a horizontal row under the text. On a phone the first image shows large with the next peeking in from the right, inviting a swipe. The row looks tidiest when every image has the same proportions, so choose one size for the whole set before you start.

1. 1

   Choose one shape for the set

   Portrait for a story told across images, square for a set of equals such as products or quotes.

2. 2

   Make the first image answer the post

   Most readers see the first image and the peek of the second. If the first one only says "swipe", many won't.

3. 3

   Keep a visual thread

   The same background, type and margins on each image, so the row reads as one piece. Carousels that flow across slides shows how to run one design across every image.

4. 4

   End with something worth replying to

   Threads rewards conversation. A last image with a question or an opinion gives people a reason to answer.

Landscape images and vertical video are both allowed, and both have a place. A wide 1600×900 chart or screenshot reads fine when it is tapped open, but in the scrolling feed it is a thin strip, so set any words on it larger than feels natural. Vertical clips made for Reels at 1080×1920 play in the feed at a reduced height; keep their captions away from the very top and bottom, as you would in a story.

Matching Threads and Instagram

Threads is made by Instagram, most people use it with their Instagram account, and you can share a Threads post to your Instagram story. The sizes match, so the practical question is not resizing but tone. An Instagram post is often a finished picture with a caption. A Threads post is a thought with an image as evidence.

That changes what you put on the image. On Instagram a headline on the picture does the work, because many people never read captions. On Threads the post text is already saying it, so repeating it on the image wastes the space. Use the image for the thing words can't carry: the chart, the before and after, the quote card with your best line, the screenshot of the result.

What to post on Threads as a brand

• Quote cards pulled from your own writing, newsletter or talks. See quote card design.
• Behind the scenes photos with a sentence of context, more candid than your Instagram grid.
• Charts and lists that back up an opinion in the post.
• Announcements where the image is the clean, branded version of the news and the post explains it.
• Questions with an image that shows the options, so replies come easily.

Whatever you post, keep it recognisably yours. A consistent background and typeface turn a casual feed into a brand people remember. In Gradiently every design can wear your Mark, so a Threads quote card, an Instagram carousel and a story all share one look, and on Pro you can resize one design to every size in one step. The broader approach is in consistent branding across social media, and every format sits in social media image sizes.

Finally, write alt text. Threads lets you describe each image when you attach it, and on a feed built around reading, a short description of the chart or quote means everyone gets the point, including people using screen readers. Describe what the image says, not just what it looks like: "Bar chart: bookings tripled after Sunday opening" is more useful than "chart".