Ever noticed how some ads on Reddit look perfectly at home in the feed while others feel clumsy or out of sync? The difference often comes down to something small but critical: the dimensions. Getting the size right isn’t just about fitting content neatly within a frame; it’s about aligning with Reddit’s native experience and preserving user trust.

If your ad looks cropped or cluttered, it instantly breaks immersion. And on a platform where authenticity rules, poor presentation can mean losing both clicks and credibility. So, what are the right Reddit ad sizes, and why do they matter so much? Let’s explore.

The Best Reddit Ad Dimensions

Here are Reddit’s recommended ad sizes across major formats:

• Image Ad: 1200 × 628 pixels (16:9 ratio)
• Video Ad: 1080 × 1080 (1:1) or 1200 × 628 (16:9)
• Carousel Ad: 1080 × 1080 pixels per image
• Banner Ad (Desktop): 300 × 250 pixels
• Link Preview: Minimum 120 × 120 pixels

These dimensions ensure your ads look clean, load fast, and stay visually consistent across devices.

Why Ad Sizing Matters More Than You Think

Reddit is unlike most social platforms. It’s built on conversation, community, and credibility. Users value organic interaction, and anything that looks overtly “advertising” often gets ignored or downvoted. Correct sizing helps your ads blend naturally into this environment, keeping them visually balanced and engaging.

A well-sized ad feels professional and intentional. It loads quickly, fits neatly within Reddit’s layout, and doesn’t interrupt the user experience. In short, proper formatting isn’t just aesthetic; it’s strategic.

The Main Reddit Ad Formats Explained

Image Ads (Promoted Posts)

Image ads resemble regular Reddit posts but carry a small “Promoted” tag. The recommended size is 1200 × 628 pixels in JPG or PNG format. Keeping the file under 3 MB ensures fast loading.

They’re best for awareness campaigns or conversation-driven promotions. In digital display advertising, simplicity works best: clear visuals, brief headlines, and content that feels native to each subreddit.

Video Ads

Video ads bring motion and storytelling to Reddit’s static feed. Use 1080 × 1080 px for square or 1200 × 628 px for landscape layouts, preferably under 1 GB. Short videos, ideally under 15 seconds, perform best, as users scroll fast.

The key is immediacy: capture attention within the first few seconds and communicate your message even without sound.

Carousel Ads

Carousel ads allow multiple images in one post, each 1080 × 1080 px. They’re great for product showcases, tutorials, or storytelling sequences. With up to six slides available, you can guide users through a mini-narrative or highlight different product features without overwhelming them.

Banner Ads (Sidebar Placement)

Banner ads appear only on Reddit’s desktop sidebar. The ideal size is 300 × 250 px. Though smaller and static, they offer consistent visibility, making them valuable for brand recall or retargeting campaigns.

Designing for Reddit’s Unique Audience

Sizing is only half the story; design and tone complete it. In product advertising, Reddit users prefer ads that feel genuine, not overly polished or sales-driven. The best-performing creatives look like part of the conversation, not an interruption.

Use clean visuals, minimal text, and natural colours that blend with Reddit’s simple layout. Avoid heavy branding or loud graphics. Always preview your ads on both desktop and mobile; what fits one screen may appear awkward on another.

Common Mistakes to Avoid

Poor formatting, low-resolution images, or ignoring mobile optimization are frequent pitfalls. Since most users browse on phones, your design must adapt smoothly across devices. Over-branding is another turnoff; subtle, community-aware messaging works far better. Consistency in style and size across ads also reinforces trust and recognition.

How Proper Sizing Boosts Results

Correct dimensions improve both look and performance. Well-sized visuals load faster, display accurately, and often achieve better engagement. Reddit’s system favours ads that meet quality standards, so precise formatting can enhance delivery and ROI. In short, the right size doesn’t just make your ad look good; it helps it perform better.

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Summary

Perfecting Reddit ad sizes is one of the simplest ways to elevate your campaign’s professionalism and impact. Accurate dimensions make your ads look natural, load quickly, and blend seamlessly with Reddit’s user-driven ecosystem. Whether you’re promoting a single image, a video, or a carousel, consistency and authenticity remain the keys to better engagement.

By focusing on size, tone, and presentation, advertisers can transform generic posts into meaningful interactions, not by standing out loudly, but by fitting in intelligently.

FAQs

What’s the best Reddit ad size for mobile users?

A square 1080 × 1080 px layout works best across both desktop and mobile.

Can I reuse ads from other platforms?

Yes, but resizing is crucial to prevent cropping or distortion.

Do Reddit video ads autoplay?

They do, but only when in view. Keep them short and attention-grabbing.