Instagram Post Size: Complete Guide to Image Dimensions (2026)

Instagram post size is the pixel width and height of an image you upload to your feed. The standard is 1080 pixels wide, with height varying by format — square (1080 × 1080 px), landscape (1080 × 566 px), or vertical (1080 × 1350 px).

What Is Instagram Post Size and Why Does It Matter?

Get the size wrong and Instagram either crops your image automatically or compresses it into something blurry. Neither is ideal — especially if you're posting branded content or anything where composition matters.

What's often overlooked is that Instagram actually supports a range of sizes, not just one. The platform accepts images anywhere between a 1.91:1 and 4:5 aspect ratio. Anything outside that range gets cropped without asking you first.

In practice, most creators and social media teams default to vertical (4:5) for feed posts because it takes up the most screen space on mobile. That's where the majority of Instagram scrolling happens.

Instagram Feed Post Sizes — Quick Reference

The 1080px width rule applies across all three. Go wider and Instagram resizes it down. Go narrower than 320px and it gets upscaled — which usually looks bad.

Instagram Post Size by Format

Square Posts — 1080 × 1080 px

The original Instagram format. Still works well. Square posts sit cleanly on the profile grid without much cropping, which makes them a safe choice if your grid's visual consistency matters to you. Good for product shots, quote cards, and centered compositions.

Landscape Posts — 1080 × 566 px

The widest format Instagram allows. Useful for architecture, scenery, or anything with a strong horizontal element. The trade-off: on your profile grid, landscape posts lose the most from the sides because the grid crops everything to a vertical ratio. Worth knowing before you commit to the format.

Vertical Posts — 1080 × 1350 px

This is the 4:5 ratio — the tallest format Instagram supports for feed posts. It fills more of a viewer's phone screen as they scroll, which is why teams commonly report better visibility with vertical posts compared to square or landscape. It's not a dramatic difference, but more screen space generally means more attention.

Carousel Posts

Same rules as single posts. Recommended size: 1080 × 1350 px. One thing that catches people out — all slides in a carousel must use the same aspect ratio. If they don't, Instagram crops the others to match the first slide. Set your ratio before you start, not after.

Video Posts (Feed)

Feed videos follow the same aspect ratio range as image posts (1.91:1 to 4:5). Recommended dimensions are identical to the image formats above. Max file size is 4 GB, and standard feed videos can run up to 60 seconds.

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Stories, Reels, and Profile Photo Sizes

Instagram Stories Size

Full-screen vertical at 1080 × 1920 px (9:16 ratio). Both photos and videos use this format. The safe area — the part of the frame that won't be covered by Instagram's UI elements — is 1080 × 1610 px. Keep text, faces, and key visuals inside that zone.

Instagram Reels Size

Reels display differently depending on where they're viewed:

• In the feed / full screen: 1080 × 1920 px (9:16)
• On the profile grid: 1080 × 1440 px (3:4)

Anything near the top or bottom of your Reel may be cut off in the grid thumbnail. Frame your key content in the middle third of the frame to stay safe across both views.

Profile Photo Size

• Upload at: 320 × 320 px minimum
• Displayed at: 110 × 110 px
• Shape: Cropped to a circle

Keep your subject centered. The circular crop removes the corners, so anything important pushed to the edges will disappear.

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Feed Display vs. Grid Display — Not the Same Thing

This is where a lot of people get confused. And honestly, Instagram doesn't make it obvious.

In the feed, your image shows in its native ratio — vertical looks tall, landscape looks wide, square looks square. Exactly what you uploaded.

On your profile grid, Instagram forces every post into the same vertical crop. Landscape images lose their sides. Square images lose their top and bottom slightly. Only vertical (4:5) posts come through the grid crop relatively intact.

Feed vs. Grid Display

If your grid's visual appearance matters — for a brand account or a curated aesthetic — vertical posts are the most predictable choice.

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Which Instagram Post Size Should You Actually Use?

Depends on what you're posting. There's no single right answer, but there are logical defaults.

Format Decision Guide

At first glance the choice seems arbitrary, but vertical posts consistently occupy more screen real estate on mobile — and most Instagram users are on mobile. That's the practical reason most accounts have shifted toward 4:5 as a default.

As noted by The Verge, mobile-first vertical formats have become the dominant standard across major social platforms as smartphone usage continues to shape how content is designed and consumed.

How Instagram Handles the Wrong Size

Instagram doesn't reject out-of-spec images. It just fixes them — on its terms, not yours.

• Wider than 1080px: Resized down to 1080px. No quality gain from uploading larger.
• Narrower than 320px: Resized up. Expect visible blur or pixelation.
• Between 320px and 1080px: Kept as-is, provided the aspect ratio is within range.
• Aspect ratio outside 1.91:1 to 4:5: Auto-cropped. You don't get to choose where.
• Minimum practical width: 500px for clean display.

Uploading at exactly 1080px wide in JPG or PNG format avoids all of the above.

Instagram Image File Requirements

Recommended formats:

• JPG — best for photos and gradient-heavy images. Smaller file size.
• PNG — best for graphics, text, logos, or transparent backgrounds.
• WEBP / HEIC — accepted from mobile uploads (iPhone, Android). Auto-converted on upload.

Instagram doesn't publish a hard file size limit for standard posts. Large files get compressed automatically. Starting at 1080px wide means you're not giving Instagram anything extra to strip out.

One thing worth noting: uploading a 4000px wide image will not make your post look sharper. Instagram renders everything at 1080px maximum. The extra resolution gets discarded during upload processing.

Instagram also allows alt text under Advanced Settings before you post. It's indexed internally and improves accessibility. Most accounts skip it — which is a missed opportunity, particularly for brands.

As reported by Wired, accessibility features across social media platforms have become an increasingly important consideration for creators and brands building inclusive digital presences.

Instagram Ad Image Sizes

Standard post sizes and ad sizes are not always the same. If you're running paid placements, use these dimensions.

Instagram Ad Image Sizes

For Stories and Reels ads, keep the top 14% and bottom 20% of the frame clear of text, logos, or key visuals. Instagram's interface overlays cover those areas.

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Full Instagram Size Reference (2026)

All Instagram Image Sizes at a Glance

Conclusion

Upload at 1080px wide. Use vertical (4:5) for maximum feed visibility. Know that the grid crops everything — landscape and square posts lose the most. For Stories and Reels, 1080 × 1920 px is the standard. File format: JPG for photos, PNG for graphics.

Frequently Asked Questions

What is the ideal Instagram post size in 2026?

1080 × 1350 px (4:5 vertical) fills the most screen space in the feed and loses the least in the grid crop. Square (1080 × 1080 px) is a reliable alternative for centered compositions.

What happens if I upload the wrong image size?

Instagram auto-corrects it — resizing oversized images down, upscaling undersized ones, and cropping anything with an unsupported aspect ratio. You don't get to choose where it crops.

Does a higher resolution improve Instagram image quality?

No. Instagram caps display at 1080px wide and compresses everything larger. Uploading at 1080px is sufficient — going higher adds no visible quality benefit.

What is the difference between post size and Stories size?

Feed posts range from 1080 × 566 px to 1080 × 1350 px. Stories are full-screen at 1080 × 1920 px (9:16). Stories fill the entire phone screen; feed posts appear within a scrollable timeline.

What file format should I use for Instagram posts?

JPG for photographs, PNG for graphics or anything with text and transparency. Mobile uploads in HEIC or WEBP are accepted and converted automatically.