Instagram Carousel Size Guide: Dimensions, Specs & Best Practices

Why Carousel Dimensions Matter

Getting your carousel dimensions wrong leads to cropped text, blurry images, and unprofessional-looking posts. Instagram and TikTok each have specific requirements, and the platform will automatically resize or crop your content if it does not meet them.

This guide covers every technical specification you need, along with practical recommendations for maximizing visual impact.

Instagram Carousel Specifications (2025)

Supported Aspect Ratios

Instagram allows three aspect ratios for carousel posts. All slides within a single carousel must use the same aspect ratio — you cannot mix square and portrait slides.

Aspect Ratio	Pixel Dimensions	Use Case
1:1 (Square)	1080 x 1080 px	Classic format, works well for text-heavy content
4:5 (Portrait)	1080 x 1350 px	Recommended. Maximum feed space, best engagement
16:9 (Landscape)	1080 x 608 px	Rarely used. Wastes vertical feed space

Why 4:5 Is the Best Ratio

The 4:5 portrait ratio occupies 78% more vertical screen space than the 16:9 landscape ratio. On a mobile device, a 4:5 carousel post fills nearly the entire screen, leaving almost no room for competing content.

According to Hootsuite's 2024 analysis, carousels using the 4:5 ratio achieve 12–15% higher engagement than those using 1:1, simply because they dominate more visual real estate in the feed.

Image Specifications

Specification	Requirement
Minimum resolution	600 x 600 px (will be upscaled, looks blurry)
Recommended resolution	1080 x 1350 px (4:5) or 1080 x 1080 px (1:1)
Maximum resolution	1936 x 1936 px (Instagram downscales beyond this)
File formats	JPEG, PNG
Maximum file size	30 MB per image
Color space	sRGB (Instagram converts other color spaces)
DPI	72 DPI (screen resolution; higher DPI adds file size without benefit)

Video Slide Specifications

Carousels can mix images and video slides. Here are the video requirements:

Specification	Requirement
File format	MP4 (H.264 codec recommended)
Maximum file size	4 GB per video
Maximum duration	60 seconds per video slide
Minimum duration	3 seconds
Frame rate	30 fps recommended
Audio	AAC, 128 kbps+ recommended
Aspect ratio	Must match other slides in the carousel

Number of Slides

• Minimum: 2 slides
• Maximum: 20 slides (increased from 10 in a 2024 update)
• Recommended: 7–10 slides for optimal engagement

Caption and Hashtag Specs

Element	Limit
Caption length	2,200 characters
Hashtags	30 maximum (5–15 recommended)
Mentions	20 maximum per post
Alt text	100 characters per slide

TikTok Carousel Specifications (2025)

TikTok's carousel format (called "Photo Mode" or "Photo Post") has different specs:

Specification	Requirement
Aspect ratio	9:16 (vertical, 1080 x 1920 px) recommended
Alternative ratios	1:1 (1080 x 1080 px) supported
Number of slides	2–35 slides
File formats	JPEG, PNG
Maximum file size	20 MB per image
Caption length	4,000 characters
Hashtags	No hard limit, but 3–5 recommended

Key Differences: Instagram vs. TikTok Carousels

Feature	Instagram	TikTok
Best aspect ratio	4:5 (1080x1350)	9:16 (1080x1920)
Max slides	20	35
Video in carousels	Yes	No (photos only)
Music/audio	No	Yes (add music)
Swipe direction	Horizontal (left)	Horizontal (left)
Auto-advance	No	Optional (timed slideshow)
Discovery	Feed, Explore	For You Page

The most significant difference is the aspect ratio. Instagram favors 4:5 (portrait but not full-screen), while TikTok favors 9:16 (full-screen vertical). If you are creating carousels for both platforms, you will need to adjust your layouts.

Safe Zones: Where to Place Text

Not all areas of a carousel slide are equally visible. Platform UI elements (profile picture, likes, captions) overlap certain areas.

Instagram Safe Zones (4:5 / 1080x1350)

• Top 80px: Avoid placing critical text here. The username and "..." menu may overlap.
• Bottom 200px: The caption preview, like/comment/share buttons overlap this area on mobile.
• Left/right 40px: Keep text away from edges. Some devices crop slightly.
• Effective safe area: 1000 x 1070 px centered within the 1080 x 1350 frame.

TikTok Safe Zones (9:16 / 1080x1920)

• Top 150px: Status bar and navigation overlap.
• Bottom 350px: Caption, music info, and engagement buttons overlap this area.
• Right 100px: Like, comment, share, and bookmark icons sit here.
• Effective safe area: 940 x 1420 px, shifted slightly left of center.

Pro tip: Always preview your carousel on a mobile device before publishing. Desktop previews do not show UI overlaps accurately.

Typography Size Recommendations

Text readability is critical, especially on mobile. Here are minimum and recommended font sizes:

Text Element	Minimum Size	Recommended Size
Headline / Hook	36px	48–72px
Subheading	24px	28–36px
Body text	18px	20–28px
Caption / source	14px	16–20px
Slide number	12px	14–16px

These sizes assume a 1080px-wide canvas. If your canvas is smaller, scale proportionally.

Accessibility Considerations

• Contrast ratio: Minimum 4.5:1 for body text, 3:1 for large text (WCAG AA standard)
• Line spacing: 1.4–1.6x the font size
• Maximum characters per line: 35–40 for carousel slides (much shorter than web or print)
• Avoid all-caps for body text. It is harder to read. Reserve caps for short headlines only.

File Format Best Practices

JPEG vs. PNG

Factor	JPEG	PNG
File size	Smaller (100–500 KB typical)	Larger (500 KB–5 MB typical)
Compression	Lossy (some quality loss)	Lossless (no quality loss)
Best for	Photos, gradients, complex images	Text-heavy slides, sharp graphics, logos
Transparency	Not supported	Supported

Recommendation: Use PNG for text-heavy carousel slides. JPEG compression can make text look fuzzy, especially at smaller font sizes. Use JPEG for photo-based slides where file size matters.

Export Settings

When exporting from design tools:

• PNG: 8-bit, sRGB color space, no interlacing
• JPEG: 85–95% quality, sRGB color space, progressive encoding
• Resolution: Exactly 1080 x 1350 px (4:5) — do not rely on Instagram to resize

Common Dimension Mistakes

Mistake 1: Using landscape (16:9) ratio. Landscape carousels occupy minimal feed space and get scrolled past. Unless you have a specific reason, always use 4:5 or 1:1.

Mistake 2: Designing at low resolution. If you design at 540 x 675 and upscale to 1080 x 1350, the result will be blurry. Always design at the target resolution or higher.

Mistake 3: Placing text in unsafe zones. Critical text in the bottom 200px of an Instagram slide will be covered by the caption preview. Always test on mobile.

Mistake 4: Mixing aspect ratios across slides. Instagram forces all slides to the same ratio. If you upload a mix, the platform will crop them — often cutting off your text.

Mistake 5: Ignoring TikTok's different specs. A 4:5 carousel designed for Instagram will have black bars on TikTok (which expects 9:16). Resize for each platform.

Quick-Reference Cheat Sheet

For fast reference, here are the specs you need most often:

Instagram (recommended):

• 1080 x 1350 px (4:5 portrait)
• PNG for text slides, JPEG for photos
• 7–10 slides
• 30 MB max per image

TikTok (recommended):

• 1080 x 1920 px (9:16 full vertical)
• PNG or JPEG
• 2–35 slides
• 20 MB max per image

Skip the Specs — Let AI Handle It

Remembering dimensions, safe zones, and export settings for every platform is tedious. With Caroubolt, every carousel is automatically generated at the correct dimensions for your target platform. The AI places text within safe zones, uses readable font sizes, and exports at the optimal resolution.

Describe your idea, pick your platform (Instagram or TikTok), and Caroubolt handles the technical specs. Try it free — no card required.