Image sizes for sharing app screenshots on social media

Updated October 30, 2026

For most feeds, a 4:5 portrait image at 1080 × 1350 pixels shows an app screenshot largest without cropping. Use 16:9 (1600 × 900) for X, 9:16 (1080 × 1920) for Stories, 1270 × 760 for a Product Hunt gallery, and 1200 × 630 for link previews. This guide covers each platform and how to fit a tall phone screenshot into these shapes.

Platforms change their layouts often, and not all of them publish official numbers. Where a platform documents a limit, this page links to it. Where it doesn’t, the sizes are the common recommendations that display correctly as of late 2026.

Quick reference

Where	Aspect ratio	Size (px)
Instagram feed	4:5 (or 1:1)	1080 × 1350 (1080 × 1080)
Instagram and Facebook Stories, Reels	9:16	1080 × 1920
X (Twitter) post	16:9	1600 × 900 or 1200 × 675
LinkedIn post	4:5, 1:1 or 1.91:1	1080 × 1350, 1080 × 1080, 1200 × 627
Threads	4:5 or 1:1	1080 × 1350 or 1080 × 1080
Bluesky	4:5, 1:1 or 16:9	Under 2 MB per image
Mastodon	Any; set a focal point	Up to 8.3 megapixels
Product Hunt gallery	about 5:3	1270 × 760
Link previews (Open Graph)	1.91:1	1200 × 630

Why phone screenshots get cropped

An iPhone screenshot is about 9:19.5, taller than any feed allows. Post it as it is and most platforms either crop the preview to the middle or shrink it into a narrow strip. Both make the interface hard to read.

The fix is to place the screenshot on a canvas in the shape the platform expects, usually with a device frame and some background around it. The screenshot keeps its full height, and the platform shows the whole image.

X (Twitter)

A single image shows in the timeline uncropped when it’s 16:9. Guides such as Metricool’s recommend 1600 × 900 or 1200 × 675, both 16:9. Taller images can be cropped in the timeline preview, so keep anything important near the center.

For app screenshots this means a landscape canvas. One phone in the middle of a 16:9 image leaves wide margins, so it works best for two or three screens side by side, or one phone with a headline beside it.

Instagram

Feed, portrait 4:5 at 1080 × 1350. This takes up the most screen space in the feed and suits a single phone screenshot well.
Feed, square 1:1 at 1080 × 1080. Use this when you mix the post into a grid or carousel with other square images.
Stories and Reels, 9:16 at 1080 × 1920. A phone screenshot fills most of a Story. Leave room at the top and bottom, where Instagram draws its own controls.

These are the sizes most guides agree on, including Hopper HQ’s 2026 reference. Instagram crops feed images taller than 4:5, so don’t go taller than 1080 × 1350 in the feed.

LinkedIn shows a 1.91:1 image at 1200 × 627 for link posts and wide images. For an image post, a 4:5 portrait at 1080 × 1350 or a 1080 × 1080 square takes more of the feed. SocialPilot’s guide lists the same sizes. For a product launch post, a 4:5 image with one framed screenshot and a short headline does well.

Threads

Meta doesn’t publish an image size table for Threads. The 4:5 and square sizes you’d use on Instagram, 1080 × 1350 and 1080 × 1080, display well in the Threads feed, so the same export works on both.

Bluesky

A Bluesky post can hold up to four images. The AT Protocol’s image embed definition caps each image at 2,000,000 bytes, about 2 MB; earlier versions allowed only 1 MB. A larger image has to be compressed before it goes up, by the app or your posting tool, so export a JPEG under that size if you want to control the quality yourself.

A single image shows close to its own shape, so 4:5 or 1:1 gives a phone screenshot the most room. For multi-image posts, use the same shape for every image so the grid lines up.

Mastodon

According to Mastodon’s documentation, you can attach up to four images of up to 16 MB each, and images are downscaled to 8.3 megapixels (enough for 3840 × 2160). Previews in the timeline can be cropped, so set a focal point with the Edit link on the attachment. The preview crop then keeps the part that matters, such as the phone rather than the background. Write a description there too, since many people on Mastodon rely on them.

Product Hunt

Product Hunt’s posting guide recommends 1270 × 760 for gallery images, a little squarer than 16:9. The first image also shows as a thumbnail, so make it your strongest screenshot, with the app clearly visible at a small size.

Blog posts and link previews

When someone shares a link to your site, most platforms show the page’s Open Graph image, set with the og:image tag. The usual size is 1200 × 630, which is 1.91:1. The Open Graph protocol itself doesn’t set a pixel size, but this one renders as a full-width card nearly everywhere. Keep text and the screenshot away from the edges, since some platforms trim the sides slightly.

Tips for app screenshots on social media

One idea per image. One screen, one short headline. A feed is scrolled fast.
Export at the platform’s size, not larger. A 4K image gets compressed hard on upload. Exporting at 1080 pixels on the short side gives the platform less to compress.
Use JPEG for social media. It’s smaller than PNG, survives platform compression better, and has no transparency to be flattened into a black border.
Frame the screenshot. A device frame tells people they’re looking at an app, not a photo of a screen. It also gives a tall screenshot a shape that fits the feed.
Mac windows: remove the shadow first. See how to take a Mac screenshot without the shadow, then add a background.

Making these sizes in FeatureFrame

FeatureFrame has a canvas preset for each of these shapes: 1:1, 4:5, 3:4, 2:3, 9:16, 4:3, 16:9 and 1.91:1. There’s also Fit, which wraps the canvas around the devices, and Custom for any other ratio, such as 127:76 for Product Hunt’s 1270 × 760. Export at 720p, 1080p or 4K. At 1080p, a 4:5 canvas gives 1080 × 1350, a square gives 1080 × 1080, and 16:9 gives 1920 × 1080. The Social Media setting exports a compact JPEG, and Studio exports PNG.

Drop in an iPhone or iPad screenshot and FeatureFrame finds the device from its size and frames it in a 3D model of that device. You can add up to three screenshots side by side for 16:9 posts. See every frame in the device frame library, and if you’re also preparing a store listing, the App Store screenshot sizes guide lists the exact sizes Apple accepts.