![LinkedIn Single Image Ads Specs: Complete Specifications Guide [2026]](/_next/image?url=https%3A%2F%2Fwp.zenabm.com%2Fwp-content%2Fuploads%2F2026%2F01%2FLinkedIn-Single-Image-Ads-Specs.png&w=1920&q=75)
Getting LinkedIn single image ads specs right is critical – I’ve seen campaigns underperform simply because the image was cropped wrong or the text got truncated. After running hundreds of single image ads over the past 16 months, I’ve learned exactly which specs matter and where teams commonly make mistakes.
Quick answer: The recommended image size for LinkedIn single image ads is 1200 x 1200 pixels (1:1 ratio) for delivery across both desktop and mobile. File size maximum is 5 MB. Supported formats are JPG, PNG, and GIF.
This guide covers every specification you need – image dimensions, aspect ratios, text limits, file requirements, and device delivery – based on my real experience running these ads.
Best image size: 1200 × 1200 px
Aspect ratio: 1:1 (square)
Devices: Desktop + mobile
Max file size: 5 MB (≤2 MB recommended)
Formats: JPG, PNG, GIF
Square (1:1)
Horizontal / Landscape (1.91:1)
Vertical / Portrait (1:1.91 or 4:5)
Default choice: Square (1:1)
Maximum reach across devices
Consistent appearance
More mobile feed real estate
1:1.91 adds borders
4:5 avoids borders
Mobile-only delivery limits reach
PNG (preferred)
JPG
GIF (limited use)
Max: 5 MB
Recommended: under 2 MB
Images are auto-scaled
Start with high resolution
Avoid scaling up low-res assets
300 DPI source recommended
Introductory Text
Max allowed: 600 characters
Recommended: ≤150 characters
Above 150 → “Read more” truncation
“Read more” clicks count as paid clicks
Headline
Max allowed: 200 characters
Recommended: ≤70 characters
Mobile truncates aggressively above ~70
Description (LAN only)
Max allowed: 300 characters
Recommended: 70 characters
Required only if LinkedIn Audience Network is enabled
Text truncation triggers “Read more”
“Read more” clicks are paid clicks
15–20% of clicks can be wasted
Front-load key value
~80% of traffic is mobile
Mobile truncates text earlier
Square & vertical images dominate feed
Design mobile-first
HTTPS required
Max length: 2000 characters
UTMs supported
Mobile-optimized landing pages required
Apply
Download
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Learn More
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47% of top performers include CTA in-image
Use high-contrast colors
Make the action visually obvious
Square: 1200 × 1200 px
Horizontal: 1200 × 628 px
Format: PNG or JPG
File size: ≤5 MB (≤2 MB ideal)
Intro text: ≤150 characters
Headline: ≤70 characters
LAN description: ≤70 characters
Low-resolution images
Wrong aspect ratios
Vertical images killing desktop reach
Intro text over 150 characters
Large file sizes
Too much text in images
Supports square + horizontal
No vertical delivery
Larger display area
Supports all orientations
Earlier text truncation
Primary optimization target
High contrast wins
Dark backgrounds + bright text perform best
<20% of image area
Large, readable fonts
One core message
In-image CTAs outperform
Real photos beat stock
Diagrams & flowcharts perform well
Default to 1200 × 1200 px (1:1)
Keep intro text under 150 characters
Keep headlines under 70 characters
Optimize for mobile first
Specs compliance = performance lever
LinkedIn supports three image orientations. I’ve tested all of them, and here’s what you need to know:
| Orientation | Aspect Ratio | Minimum Size | Maximum Size | Recommended Size | Delivery |
|---|---|---|---|---|---|
| Horizontal (Landscape) | 1.91:1 | 640 x 360 px | 7680 x 4320 px | 1200 x 628 px | Desktop + Mobile |
| Square | 1:1 | 360 x 360 px | 4320 x 4320 px | 1200 x 1200 px | Desktop + Mobile |
| Vertical (Portrait) | 1:1.91 or 4:5 | 360 x 640 px | 2430 x 4320 px | 628 x 1200 px or 720 x 900 px | Mobile Only |
I almost always use square (1:1) images. Here’s why:
Critical point: Vertical images (1:1.91 or 4:5) only serve on mobile devices. If you use vertical images, desktop users won’t see your ads at all. I made this mistake early on – wondered why my reach was so low, then realized half my audience never saw the ad.
If you do use vertical orientation:
| Format | Extension | Best For |
|---|---|---|
| JPEG | .jpg, .jpeg | Photos, complex images with gradients |
| PNG | .png | Graphics, logos, text overlays, transparency |
| GIF | .gif | Simple animations (note: limited use) |
In practice, I use PNG for almost everything. It handles text overlays crisply and supports transparency for layered designs. JPEG works fine for photo-heavy ads, but PNG gives me more flexibility.
Large files slow down ad loading, especially on mobile connections. I compress all my images to under 2 MB – there’s no visible quality difference, and load times improve.
This is where I see the most mistakes. LinkedIn’s character limits are generous, but what actually displays is much shorter.
| Element | Maximum Characters | Recommended Characters | Notes |
|---|---|---|---|
| Ad name | 255 | N/A | Internal only – not shown to users |
| Introductory text | 600 | 150 | Truncates above 150 chars with “Read more” |
| Headline | 200 | 70 | May truncate on mobile above 70 chars |
| Description (LAN) | 300 | 70 | Only for LinkedIn Audience Network |
This is a costly mistake I see constantly. Although LinkedIn allows 600 characters for introductory text, anything above 150 characters gets truncated with a “Read more” link.
The problem: Every click on “Read more” counts as a charged click. You’re paying for curiosity, not intent.
I analyzed my campaigns and found that 15-20% of clicks were going to text expansion, not to my landing page. That’s wasted budget. Now I keep every intro text under 150 characters – front-load the important information, don’t bury the lead.
Headlines display differently across devices:
Since 80% of LinkedIn traffic is mobile, I design for mobile first. If my headline works on mobile, it works everywhere.
| Specification | Requirement |
|---|---|
| URL prefix | http:// or https:// (required) |
| Maximum length | 2000 characters |
| Tracking parameters | Supported (UTM, etc.) |
I always test my landing pages on mobile before launching any campaign. A slow or broken mobile experience wastes your entire ad budget.
LinkedIn provides predefined CTA buttons. Available options vary by campaign objective:
| CTA Button | Best For |
|---|---|
| Apply | Job applications |
| Download | Ebooks, whitepapers, resources |
| Get Quote | Services, custom pricing |
| Learn More | General awareness, education |
| Register | Events, webinars |
| Request Demo | SaaS, product demonstrations |
| Sign Up | Free trials, accounts |
| Subscribe | Newsletters, updates |
| View Jobs | Recruitment campaigns |
Here’s something I learned from analyzing our 2026 LinkedIn ABM Benchmarks Report: 47% of top-performing ads include a CTA button within the image itself – not just LinkedIn’s default button.
I now add a high-contrast CTA button (neon green, yellow, or blue) directly into my ad images. It makes the action obvious and increases clicks.
Quick reference for all LinkedIn single image ads specs:
| Specification | Recommended |
|---|---|
| Dimensions (Square) | 1200 x 1200 px |
| Dimensions (Horizontal) | 1200 x 628 px |
| File format | JPG or PNG |
| File size | Under 5 MB (2 MB recommended) |
| Aspect ratio | 1:1 (square) or 1.91:1 (horizontal) |
| Element | Recommended Length |
|---|---|
| Introductory text | 150 characters (max 600) |
| Headline | 70 characters (max 200) |
| Description (LAN) | 70 characters (max 300) |
Let me save you some budget by sharing the mistakes I made early on:
I started with small images that got scaled up – result was blurry, pixelated ads that looked unprofessional. Always use the recommended dimensions or larger.
Fix: Use 1200 x 1200 px or 1200 x 628 px minimum. No exceptions.
Images that don’t match LinkedIn’s aspect ratios get cropped automatically – often cutting off important elements like CTAs or headlines in the image.
Fix: Design to exact aspect ratios (1:1, 1.91:1, or 4:5 for mobile-only). I use templates in Figma with the exact dimensions.
I ran a campaign with beautiful vertical images – then wondered why reach was so low. Turns out, desktop users (roughly 20% of my audience) never saw them.
Fix: Use square (1:1) for maximum reach across all devices.
My early ads had 400+ character intros with all the details. Great content, but truncated to “Read more” – and those clicks cost money without driving conversions.
Fix: Keep intro text under 150 characters. Front-load key information.
I uploaded 4 MB images without compression. Ads loaded slowly, especially on mobile.
Fix: Compress images to under 2 MB while maintaining quality. Tools like TinyPNG work great.
I tried cramming paragraphs of text into ad images. They looked cluttered and performed poorly.
Fix: Keep text to less than 20% of the image area. LinkedIn’s feed is already text-friendly – let your intro text do the talking.
If enabling LinkedIn Audience Network for extended reach (but I do NOT recommend it!) :
I don’t use LAN for ABM campaigns – it extends beyond your target accounts. But for broader demand gen, it can be useful.
Beyond just meeting specs, here are design recommendations based on analyzing high-performing ads:
Here are the essential LinkedIn single image ads specs to remember:
Ready to launch LinkedIn single image ads? Start with ZenABM to track which accounts engage with your campaigns.
1200 x 1200 pixels (1:1 square ratio) is what I recommend for delivery across both desktop and mobile. For horizontal images, use 1200 x 628 pixels (1.91:1 ratio).
LinkedIn accepts JPG, PNG, and GIF files. Maximum file size is 5 MB. I use PNG for most ads because it handles text overlays crisply.
Maximum is 200 characters, but 70 characters is recommended to avoid truncation on mobile devices. I never go above 70.
Introductory text above 150 characters gets truncated with a “Read more” link. Clicks on “Read more” count as charged clicks – you’re paying for text expansion, not landing page visits. Keep intro text under 150 characters.
Yes, but vertical images (1:1.91 or 4:5 ratio) only serve on mobile devices. For maximum reach across desktop and mobile, use square (1:1) or horizontal (1.91:1) images. I avoid vertical for this reason.
Three aspect ratios are supported: 1:1 (square) and 1.91:1 (horizontal) deliver to both desktop and mobile. 1:1.91 and 4:5 (vertical) deliver to mobile only.
