The Complete Guide to LinkedIn Ad Size and Specs for 2026

If you’re just looking for a quick answer, the most common LinkedIn ad size is 1080x1080 pixels—a perfect 1:1 square. This works great for a lot of single image and carousel ads. But if you really want to get the most out of your campaigns, you need to know the specific requirements for every format, from vertical video to those tiny message ad banners.

Getting these specs wrong can be incredibly frustrating. There's nothing worse than spending hours on the perfect ad creative, only to have LinkedIn’s uploader crop it awkwardly or compress it into a pixelated mess.

Your Quick Reference Table for All LinkedIn Ad Sizes

When you're up against a tight deadline, the last thing you want to do is hunt through LinkedIn's documentation for ad specs. To save you the headache and make sure your creatives always look sharp and professional, we've put together this simple "cheat sheet" for your entire creative workflow.

Think of this as your single source of truth. It’s designed to help you avoid common pitfalls like your call-to-action getting cut off or your brand logo looking blurry. Getting the LinkedIn ad size right from the start is the first and most important step to running a campaign that looks like it was built by a pro.

LinkedIn Ad Spec Quick Reference Table (2026)

Here’s a quick summary of the most critical dimensions and file size limits for the most popular LinkedIn ad formats. Use this to double-check your work and keep your production process moving. Keep in mind that every platform has its own rules, so if you're running campaigns elsewhere, you'll need different specs. For example, we've put together a similar resource in our complete guide to Meta ad sizes.

Ad Format	Recommended Dimensions (Pixels)	Aspect Ratio	Max File Size
Single Image Ad	1200 x 1200 (Desktop & Mobile)	1:1	5 MB
Video Ad	1080 x 1920 (Vertical)	9:16	200 MB
Carousel Ad Card	1080 x 1080	1:1	10 MB
Document Ad	N/A (Document Upload)	N/A	100 MB
Message Ad Banner	300 x 250	1.2:1	40 KB
Text Ad Logo	100 x 100	1:1	2 MB
Dynamic Ad Logo	100 x 100	1:1	2 MB

Bookmark this page and use it as your go-to reference. With these numbers handy, you can spend less time troubleshooting uploads and more time focusing on what really matters: crafting campaigns that drive results.

Why Getting LinkedIn Ad Specs Right Maximizes Your ROI

Getting your LinkedIn ad size and creative specs right isn't just about ticking a technical box—it's a critical part of maximizing your return on investment. On a platform packed with high-value professionals, every single ad impression is an opportunity you can't afford to waste. Submitting an ad with the wrong dimensions is one of the fastest ways to burn through your budget with nothing to show for it.

When an image or video doesn't fit the required specs, LinkedIn's platform has to force it. That means your carefully designed creative gets automatically cropped, stretched, or compressed. The result? Key parts of your message are cut off, your visuals turn blurry, and your brand looks unprofessional, causing prospects to scroll right on by. In a worst-case scenario, LinkedIn might reject the ad entirely, derailing your campaign schedule and killing your momentum.

Protect Your Ad Spend

Following the specs is a direct line of defense for your budget. It stops you from paying for ineffective impressions and ensures your message is delivered exactly as you intended. A pixel-perfect ad creative is the bedrock of any successful campaign, and nailing the technical details is the first step.

This is more important than ever, given how quickly the platform is growing. LinkedIn's audience is set to expand from 900 million users in 2023 to an estimated 1.2 billion users by January 2025. While that means more opportunities to connect with qualified professionals, it also means a lot more competition for their attention.

This infographic gives you a quick summary of the core creative formats.

As you can see, image, video, and carousel ads each have their own unique requirements. A one-size-fits-all approach just doesn't work here.

Align Your Creative with Your Strategy

Properly sized ads don't just look better; they perform better. Simple as that. When your creative is optimized for each ad placement, you’ll see better click-through rates, higher engagement, and ultimately, more conversions. This isn't just a technical chore; it's a fundamental part of a smart marketing strategy.

A pixel-perfect ad is your first handshake with a potential customer on LinkedIn. It signals professionalism and attention to detail before they even read a single word of your copy.

To make sure your sharp-looking ads are part of a winning game plan, take a look at these 10 High-Impact LinkedIn Marketing Strategies. Think of spec adherence as a strategic advantage. It’s what guarantees your budget is spent showing your ads at their absolute best to a valuable and growing audience of professionals.

Carousel and Document Ad Specifications

Single images and videos are the bread and butter of LinkedIn ads, but sometimes you need more room to tell your story. This is where Carousel and Document Ads come in—two of my favorite formats for driving real engagement.

These ad types let you go way beyond a single message, offering more value right in the feed. They're perfect for breaking down complex products or sharing high-value content. Getting the LinkedIn ad size and specs right for these multi-part ads is what separates a slick, professional experience from a clunky, amateur one.

Carousel Ad Specs

Carousel ads let you pack multiple images or videos into one interactive, swipeable unit. I love using them to show off different product features, walk through a step-by-step process, or feature a handful of killer testimonials. Each image or video in the carousel is called a "card."

Number of Cards: You'll need at least 2 cards to start, but you can go all the way up to 10 cards.
Introductory Text: Keep your intro text under 150 characters to avoid getting cut off. The absolute maximum is 255 characters, but trust me, shorter is better here.
Card File Type: Standard JPG, PNG, or non-animated GIF files work just fine for your cards.
Max File Size per Card: Each card has to be 10 MB or less.

Card Dimensions and Ratios

Consistency is everything for a clean, professional-looking carousel. You can technically mix and match aspect ratios between cards, but I strongly advise against it. It creates a jarring, unprofessional experience that pulls the user right out of your story.

A consistent aspect ratio across all cards creates a seamless swiping motion. The 1:1 square aspect ratio is the undisputed gold standard for LinkedIn carousels.

Recommended Size: Stick with 1080 x 1080 pixels for every single card.
Rich Media Support: You can also drop videos into your carousel cards. Just make sure they also follow the 1:1 aspect ratio and meet the standard video ad requirements.

This multi-card format is a winner on other platforms, too. If you want to see how it works elsewhere, take a look at our guide on creating compelling carousel ads for Instagram.

Document Ad Specs

Document Ads are one of LinkedIn’s best-kept secrets for lead generation. Seriously. This format lets you share chunky, high-value content like white papers, case studies, or ebooks directly in the feed as a previewable, downloadable file.

It’s a fantastic way to establish your brand as a thought leader and pull in high-intent leads. The ad shows up looking like a standard post but features a document preview that users can click through. The trick is to create a document so compelling that people are eager to download it, usually in exchange for their info via a Lead Gen Form.

Document File Requirements

Your document needs to look polished and ready for business. LinkedIn supports all the usual file formats you'd expect.

Supported File Types: PDF, DOC, DOCX, PPT, and PPTX.
Max File Size: The whole document needs to stay under 100 MB.
Page and Word Count: You've got a lot of room to work with—up to 300 pages or 1 million words.

For the ad creative itself, you'll supply the intro text and a headline for the post that holds your document.

Introductory Text: You can use up to 600 characters, but always focus on making your point in the first 150.
Document Title: The title displayed right on the ad can be up to 70 characters.

When you're designing your document, put extra love into the first page. It acts as the cover image for your ad and is your only shot to grab someone's attention. Make it visually appealing with a big, clear, benefit-driven title that makes them think, "I need to read this."

Message and Conversation Ad Creative Specs

Most LinkedIn ads fight for attention in a busy feed. Message and Conversation Ads play a different game entirely—they open a direct line to your prospect’s inbox. These formats are incredibly powerful for driving high-intent actions like event registrations or demo requests, but they demand a completely different creative mindset.

This isn't the place for flashy visuals; it's all about personalization and clarity. That’s why getting the specs right is non-negotiable. An incorrectly sized banner makes your message look spammy, and a confusing conversation flow will kill your chances before a prospect even sees your call to action. Let's dig into the requirements for both.

Message Ad Specs

Think of Message Ads as the simpler, more direct of the two inbox formats. You’re delivering a single, focused message straight to your target's LinkedIn inbox. The whole point is to feel like a personal, one-to-one outreach, not a generic email blast.

Banner Creative (Desktop Only): This little banner shows up in the inbox view on desktop. It must be exactly 300 x 250 pixels.
File Type: You can use JPG, PNG, or a non-animated GIF.
File Size: Keep it lightweight. The banner has to be under 40 KB.
Subject Line: You get up to 60 characters. Make them count. Be direct and give them a reason to open.
Body Text: While you have up to 1,500 characters, don't feel the need to use it all. The best-performing messages are short and scannable. Feel free to embed hyperlinks directly in your text.

A great Message Ad feels less like marketing and more like a helpful note from a real person. Use the recipient's name, reference their role or industry, and get straight to the point of why you're reaching out.

Conversation Ad Specs

Conversation Ads are where inbox marketing gets really interesting. Instead of just sending a message, you create an interactive, "choose-your-own-adventure" experience. You kick things off with an initial message and then give the user multiple CTA buttons, guiding them down different conversational paths based on their choices.

This format is fantastic for qualifying leads or pointing prospects to the most relevant resources on their own terms.

Core Creative Components

Banner Creative: The specs are the same as for Message Ads: 300 x 250 pixels and under 40 KB.
Intro Message: This is your opening line and can be up to 500 characters. It’s your one shot to set the stage and get them to engage.
Custom Terms & Conditions: If you have legal disclaimers, you have a generous 2,500 characters to include them.
Sender: You can choose a specific person from your company as the sender, which dramatically increases the personal feel of the ad.

Interactive Elements

The real magic of Conversation Ads is in the buttons and branching logic. You can build out some pretty sophisticated flows to serve different user needs all within one ad.

CTA Buttons: Each message in your flow can have between 2 and 5 buttons.
Button Text: Keep your button labels short and punchy. You only have a 25-character limit.
Next Message: Each button click can reveal another message of up to 500 characters, which can then present its own set of CTA buttons.

When you're mapping out these flows, your main job is to create clear and compelling calls to action on each button. For a deeper dive, our guide on how to write a call to action offers some great frameworks you can apply directly to your button copy. A well-designed conversation feels genuinely helpful, guiding the user to a solution instead of pushing them toward a sale.

Specs for Text, Dynamic, and Lead Gen Form Ads

While the main feed gets all the glory, some of LinkedIn's most potent ad formats live elsewhere. I'm talking about the specialized, high-intent formats: Text Ads, Dynamic Ads, and the powerful Lead Gen Forms. These aren't about broad awareness; they're designed for specific actions, from quick website clicks to capturing qualified leads right on the platform.

Getting these formats right is a game of precision. Unlike a big, visual feed ad, their success often comes down to nailing the tight character limits and using a perfectly crisp logo. Every single element has to work hard to build trust and get that click.

LinkedIn Text Ad Specs

Think of Text Ads as the original workhorse of LinkedIn PPC. They’re the simple, budget-friendly ads you see in the right-hand column or top banner on desktop. They might look basic, but for targeting a niche professional audience with a direct call to action, they are ruthlessly effective.

Because they're so compact, there's absolutely no room for error.

Company Logo/Image: You need a perfect square here, exactly 100 x 100 pixels.
File Size: Keep your logo image light, at 2 MB or smaller.
File Type: A standard JPG or PNG file works perfectly.

Your copy is just as constrained, so every word matters.

Headline: You get a mere 25 characters to grab their attention. Make it punchy.
Description: You have just 75 characters to state your case and earn the click.

Given how tight these limits are, you should always be A/B testing your headline and description. I've seen a tiny wording tweak completely change the click-through rates on these ads.

Dynamic Ad Specs (Follower and Spotlight)

Dynamic Ads are where things get personal. They automatically pull in a member’s profile photo and company details, creating a personalized ad on the fly. This touch of personalization makes them incredibly powerful for driving actions like getting new company page followers (Follower Ads) or sending traffic to your site (Spotlight Ads).

The creative pieces are minimal, but they demand precision.

Company Logo: Just like Text Ads, your logo needs to be 100 x 100 pixels and under 2 MB.
Custom Background Image (Optional): Spotlight Ads let you add a custom background image. If you use one, it should be 300 x 250 pixels.

The text is a blend of LinkedIn’s auto-generated magic and your own custom copy.

Main Ad Headline: This is your primary message, with a 50-character limit.
Call-to-Action (CTA): You have up to 18 characters for the text on your button.

Lead Gen Form Ads and Creative Requirements

Here’s a crucial point many marketers miss: LinkedIn Lead Gen Forms are not a standalone ad type. Think of them as a powerful add-on that attaches to your Sponsored Content (Single Image, Carousel, Video) or Message Ads. Their entire purpose is to capture leads without forcing someone to leave the LinkedIn app.

Because the form attaches to another ad, your creative simply has to follow the specs for that "parent" format. So, if you add a Lead Gen Form to a Single Image Ad, your image has to meet the 1:1 or 4:5 aspect ratio rules for Single Image Ads. Simple as that.

While the visual ad has its own specs, the form itself has critical character limits you need to know to create a smooth user experience.

Form Headline: Up to 60 characters.
Offer Headline: Up to 60 characters.
Offer Detail/Body Copy: Up to 160 characters.
Privacy Policy Text: A generous 2,000 characters.
Confirmation Message: Up to 300 characters.

Of course, getting the specs right is just the start. Digging into proven LinkedIn Lead Generation Strategies is what will truly elevate your campaign's ROI. A well-designed form, paired with a smart strategy, is easily one of the most effective tools in any B2B marketer's arsenal.

Even with the perfect cheat sheet, we've all been there. You spend hours crafting a brilliant ad creative, hit "launch," and... it gets rejected. Or worse, it goes live looking blurry, stretched, or with half your headline cut off. It’s incredibly frustrating, especially when you're up against a deadline.

This section is your go-to field guide for fixing those nagging technical problems. We'll move beyond generic error messages to get to the root of why these issues happen. Most of the time, it boils down to blurry images, incorrect aspect ratios, or text disappearing on mobile. Once you know what to look for, you can get your campaigns live faster and make sure your brand always looks sharp.

Solving Blurry or Pixelated Images

One of the most common complaints I hear is about images that look perfectly crisp in Figma or Photoshop but turn into a blurry mess on LinkedIn. This isn't your fault—it’s almost always a result of file resolution or over-compression.

To keep the platform speedy, LinkedIn compresses every image you upload. If your original image is too small (say, 600x600 pixels), the platform stretches it to fit the ad placement, causing that dreaded pixelation.

The Cause: You're likely uploading an image with dimensions smaller than what LinkedIn recommends (like 1200x1200 for a square ad) or saving your JPG/PNG with aggressive compression settings.
The Solution: Always export your creative assets at the exact recommended dimensions, or even slightly larger. When you export, aim for a high-quality setting—think 80% or higher for JPGs—to keep compression artifacts from ruining your design.

Fixing Ad Rejections from Wrong Aspect Ratios

If your ad gets flat-out rejected or shows up strangely cropped, the aspect ratio is the prime suspect. This happens when the shape of your creative doesn't match the ad slot's requirements. For instance, putting a wide 16:9 video into a vertical 9:16 placement will lead to ugly black bars or, more often, aggressive cropping that hides your key message.

Key Insight: LinkedIn’s system doesn't ask—it just tries to make your creative "fit." This usually means chopping off the sides or the top and bottom, which can make your logo or CTA vanish.

Before you even start designing, double-check the ratio for your chosen placement. For feed ads, a 1:1 square (like 1080x1080 pixels) is your most versatile bet, as it looks great on both desktop and mobile. If you're running into similar issues on other platforms, our guide on why your Facebook ads aren't delivering might offer some useful pointers.

Protecting Your Content in Mobile Views

Ever launched an ad that looked perfect on your desktop, only to check your phone and see the headline is awkwardly hidden behind the "See More" link? This is a classic mobile-view problem. Different devices have their own interface overlays—like profile info, CTA buttons, and other UI elements—that can cover parts of your ad.

The trick is to always design with "safe zones" in mind. A safe zone is simply the central part of your creative that's guaranteed to be visible everywhere.

Quick Safe Zone Template:

Picture a 10-15% margin around the entire border of your creative.
Place all your mission-critical elements—logos, text, product shots, and your main offer—inside this central box.
Use the outer edges for background colors, textures, or non-essential visual flair.

Following this simple rule ensures your message always gets through, no matter if someone's viewing your ad on a huge monitor or a small smartphone screen.

Frequently Asked Questions About LinkedIn Ad Specs

Even the most seasoned marketers run into questions when dealing with LinkedIn's creative specs. Getting the details right can feel like a moving target. This quick FAQ section cuts through the noise and gives you direct answers to the most common snags we see, helping you nail your creative and avoid costly mistakes.

What Is The Best LinkedIn Ad Size For Mobile?

On mobile, think vertical. Vertical aspect ratios are king. An ad sized to 4:5 or even 9:16 will dominate a smartphone screen, giving you the best possible chance to stop the scroll. It just takes up more real estate.

While a classic 1:1 square aspect ratio is a safe, versatile bet that works well on both desktop and mobile, a vertical creative is your secret weapon for the feed. That extra screen space can make all the difference between being seen and being ignored.

Can I Use Animated GIFs in LinkedIn Ads?

Yes, you can absolutely use animated GIFs for your Single Image Ads. Just make sure they stick to the same rules as any static image: keep the file size under 5 MB and follow the standard dimension specs.

GIFs are a fantastic way to inject a little motion and grab attention without committing to a full video production. Just make sure the animation has a purpose and isn't just a flashy distraction.

A subtle, well-designed GIF can really boost engagement. But an over-the-top, jerky one can look unprofessional and instantly damage your credibility on a platform like LinkedIn. Always preview it to make sure it feels on-brand.

How Do I Preview My Ad Before Launching?

LinkedIn Campaign Manager has a preview tool built right in. As you build out your ad, you can see exactly how it’s going to look on desktop, mobile, and even the LinkedIn Audience Network.

Don't skip this step. Ever. It's the only way to catch embarrassing problems like weird text wrapping, your logo getting cropped, or an overlay covering your CTA before you start spending money.

Why Does My LinkedIn Ad Image Look Blurry?

Nine times out of ten, a blurry ad image comes down to one of two culprits: low resolution or bad compression. If you upload an image that's smaller than the recommended dimensions, LinkedIn has to stretch it to fit, and that's when things get pixelated and fuzzy.

To fix it, always export your creative at the recommended LinkedIn ad size (like 1200 x 1200 pixels) or even a bit higher. When you save the file, use a high-quality setting. This prevents LinkedIn’s own compression from turning your sharp creative into a blurry mess.

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