For a photo post, LinkedIn Help recommends a width of 1080 pixels and accepts ratios from 3:1 to 4:5. For the picture on a post that carries a link, LinkedIn Help gives 1200 x 627 pixels at a 1.91:1 ratio. For carousel-style slides, upload a document post of up to 100 MB and 300 pages, and frame video so the subject still reads on a phone with the sound off.
Founders and solo B2B owners who handle branded social graphics well do three things. They pick one size per format. They build one template per format in their brand colors. They approve each post before the post goes out. The caption can come from whatever AI the founder already uses. The graphic is where most small firms lose the hour.
SocialPost.ai was built for that gap. Your ChatGPT, Claude or Grok writes the caption. SocialPost renders the brand-correct visual at the right size, formats the post for each platform and holds the post for your approval. The section near the end explains how. First, the specs.
The list below gives the figures LinkedIn publishes on its own help pages, with the format each figure applies to.
Two notes on the list. LinkedIn's Pages help says images in other ratios display in full with white padding. A square or portrait graphic will not be cut, but the white bars can make a branded graphic look like a mistake. Second, a document post cannot be edited after posting, so proofread every slide first. A typo on slide six stays on slide six.
The LinkedIn help pages we could verify cover images and documents. We checked those pages on October 9, 2026, and chose to print no video pixel figure we cannot link to LinkedIn itself. The practical rules still hold. Export at the highest resolution your camera or screen recorder gives you. Keep the speaker or the key text in the center of the frame, so a square or vertical version still works. Burn captions into the video, because a buyer scrolling on a train may have the sound off. Before you export a long recording, open the LinkedIn upload screen and read the current length and file size limits there.
Your buyers look you up before they talk to you. A SurveyMonkey and Reddit survey, published on March 10, 2026, asked 1,202 US business decision-makers how they research purchases. In that survey, 83% of decision-makers research on their own before speaking to sales. In the same survey, 70% of decision-makers have used social media at least once to research business purchases. The survey does not name LinkedIn specifically. For an owner-led B2B firm, LinkedIn is usually the social channel a buyer opens first.
A buyer who opens your company page sees the last few posts. A cropped headline, a blurry logo or a chart floating in white padding tells the buyer the firm is not paying attention. A clean, consistent set of graphics tells the buyer the firm is busy and still winning work. The size of the image is a small thing. The impression is not.
The fix is boring. Pick sizes once. Build templates once. Reuse the templates every week. Our post on five social media mistakes startup founders make covers the other habits that make a page look abandoned.
A founder with no marketing hire has four realistic routes. Each route suits a different kind of firm.
Use this decision rule. If you post less than once a week, a saved template in Canva or Adobe Express is enough. If you post every week and your captions already come from an AI assistant, your bottleneck is the graphic and the approval step, so pick a tool that takes the caption from your AI and returns a sized, branded visual for you to approve. If design quality is what you sell, pay a designer once to build the templates, then reuse the templates yourself.
One route to skip: engagement pods, bulk DM tools and anything that auto-likes or auto-comments. Those tactics are the thing not to do. A buyer judges the post on your page, and a person on your team should approve every post that appears there.
Take the PayScale average of $38.06 an hour. Assume a designer spends one hour a week on a single LinkedIn graphic, including revisions. That assumption is ours, not PayScale's. One hour a week for 52 weeks is $1,979.12 a year. At the PayScale 90th percentile of $85.11 an hour, the same hour a week costs $4,425.72 a year. Add a carousel each month and the hours climb.
Whichever route you choose, run the same checklist before each post:
Most founders reading this already have an assistant that writes well. Keep that assistant. The gap is turning the caption into a post that looks like a company shipped the post. SocialPost.ai is the operational layer between your AI and your social media. Your AI writes the caption. SocialPost renders the brand-correct visual at the right LinkedIn post size, formats the post for each platform you use, holds the post for your approval and schedules the post.
MCP is the front door. MCP, short for Model Context Protocol, is a standard way for an AI assistant to talk to another app. If you want to connect Claude to social media, or connect ChatGPT to social media, you add SocialPost to the assistant as an MCP connection. Grok works the same way. That is MCP social media posting in plain terms: you ask your assistant for a post, and the draft lands in SocialPost with the graphic already sized and on-brand.
You approve every post. Nothing publishes without your sign-off. For a wider look at the tools in this space, read our guide to the best AI social media tools.
Connect the AI you already use and start free on the Free plan.
For a photo post, LinkedIn Help recommends a width of 1080 pixels and accepts ratios from 3:1 to 4:5. For the picture on a post with a link, LinkedIn Help gives 1200 x 627 pixels at a 1.91:1 ratio.
LinkedIn's help page says a document post can be up to 100 MB and 300 pages. LinkedIn accepts PPT, PPTX, DOC, DOCX and PDF files. The document cannot be edited after posting, so proofread every slide first.
Yes. LinkedIn's photo help page says a member can select multiple images for one post. For slides that must read in a fixed order, a PDF document post keeps the sequence.
LinkedIn accepts landscape, square and vertical video. Export at the highest resolution you have, keep the subject centered, burn in captions, and check the LinkedIn upload screen for the current length and file size limits before you export.
Yes, through MCP. Add SocialPost to Claude, ChatGPT or Grok as an MCP connection. Your assistant writes the caption, and SocialPost renders the branded visual, formats the post and schedules the post. You approve every post. Nothing publishes without your sign-off.
Image: photo by Yan Krukau on Pexels.