Instagram Image Size Guide + Free Resizer (2026)

Instagram post size: the 3 ratios to know

Instagram supports three feed-post aspect ratios in 2026:

**Square (1:1) — 1080×1080 px**. Default since 2012. Still the most-used post format. Best when content has equal vertical and horizontal weight (product shots, single-person portraits, food photography).

**Portrait (4:5) — 1080×1350 px**. Takes up the most vertical real estate in the feed without being cropped. Best for engagement-driving posts — text-heavy posts, multi-element graphics, vertical photos. Most growth-focused creators use this ratio by default.

**Landscape (1.91:1) — 1080×566 px**. Used for landscape photography, sports, group shots. The least-used of the three. Often crops to a smaller display area than portrait or square.

When in doubt, 4:5 portrait. It uses the most feed space and respects most original photo compositions.

Instagram story + reel size (9:16 vertical)

Stories and reels both use 9:16 vertical aspect ratio at **1080×1920 px**. Same dimensions, different intent.

**Stories** — disappear after 24 hours unless saved to Highlights. Keep important text in the middle 80% — the top and bottom 10% get covered by your profile pic and the reply bar.

**Reels** — permanent on your profile. Same 9:16 ratio. Reels render slightly differently in the feed (cropped to 4:5 in the home feed, full 9:16 in the Reels tab). Design assuming feed-crop will cover the top 20%.

The resizer has 9:16 presets for both. Pick 'Story' if you'll add interactive stickers; 'Reel' if it's a recorded video thumbnail.

Instagram carousel size: the multi-image rule

Carousels (the swipe posts) accept all three feed-post ratios — square, portrait, landscape — but **every slide in a carousel must use the same aspect ratio**. Mix ratios and Instagram crops the inconsistent slides to match the first slide's ratio.

Most-recommended setup: 4:5 portrait (1080×1350) for the whole carousel. Maximizes feed real estate and gives more room for text overlays per slide.

Maximum 10 slides per carousel. Each individual slide should be optimized like a standalone post — first slide is the hook, slide 10 is the CTA. The resizer handles carousel-batch with the 4:5 preset.

Instagram profile photo + bio image sizes

**Profile photo**: 320×320 px display size, but Instagram stores it at higher resolution. Upload at 1080×1080 minimum so it stays sharp when zoomed.

**Profile bio image (if you use a hero card)**: any size works since it's hosted off-Instagram, but 4:5 portrait (1080×1350) is the standard.

**Highlight cover icons**: 1080×1920 px (same as stories), but only the center circle is visible. Design assuming a circular crop — center the icon, leave margin around the edges.

Instagram ad image sizes

Meta's ad platform supports more formats than organic Instagram. Common ones:

**Feed ads (single image)**: 1080×1080 (square) or 1080×1350 (portrait). **Story ads**: 1080×1920 (9:16). **Reels ads**: 1080×1920 (9:16). **Carousel ads**: 1080×1080, all slides same ratio. **Explore ads**: 1080×1080 (square only).

Meta auto-crops if you upload other dimensions, but the result is unpredictable. The resizer has Meta-ad-spec presets — pick the placement before resizing.

What happens when you upload the wrong size

Three failure modes. (1) Instagram crops your image — typically cuts the top and bottom (for square uploads in portrait slots) or the sides (for portrait uploads in square slots). (2) Black bars get added — happens with extremely wide or tall images that don't fit any supported ratio. (3) Compression artifacts — Instagram compresses every image but compresses harder on images that don't match its target dimensions. The result: blocky, blurry, low-quality posts.

Use the resizer above before uploading. Two clicks, no quality loss, perfect dimensions.