Most LinkedIn size guides still tell you to start with a wide 1200 × 627 image. That advice isn't wrong, but it's incomplete. The right LinkedIn post size depends on what you want the post to do, where people will see it, and how much of the feed your creative should occupy.
After publishing hundreds of LinkedIn posts, I've found that dimensions aren't a cosmetic decision. A horizontal graphic may suit an external link, while a 1080 × 1350 portrait image can create a stronger mobile-first presentation. Square visuals remain dependable for carousels and reusable templates. Video adds another layer, because LinkedIn accepts a broad technical range but only a narrower group of formats consistently makes practical sense.
This guide treats LinkedIn post sizes as a decision framework, not a list of isolated specifications. You'll learn which dimensions fit text posts, single images, carousels, videos, and different business goals, plus the publishing mistakes that create awkward crops, unreadable graphics, and wasted production time.
Table of Contents
- Why LinkedIn Post Size Decisions Matter More Than You Think
- Understanding Text Specs and Length Limits on LinkedIn
- Image Formats and Dimensions That Perform
- Video Upload Specs and Encoding Recommendations
- Choosing the Right Format for Your LinkedIn Goal
- Common LinkedIn Post Mistakes That Hurt Reach
- Next Steps to Publish Confidently on LinkedIn
Why LinkedIn Post Size Decisions Matter More Than You Think
The popular default creates a false sense of safety. A wide image may look polished on a desktop monitor, yet it can feel visually small in a phone feed. A portrait creative occupies more vertical space, giving your headline, diagram, or product screenshot more room to compete with surrounding posts.
That doesn't mean portrait always wins. A link preview, a presentation screenshot, or a visual designed around a wide timeline may need a wide canvas. The mistake is treating one format as a universal answer rather than matching the canvas to the job.
Practical rule: Choose the format before you design the asset. Otherwise, you'll spend time adapting a message to a shape that was never suited to it.
The current guidance is more varied than older LinkedIn posts sizes articles suggest. Sendible's LinkedIn post size coverage reflects that split, with older horizontal conventions appearing alongside square and portrait recommendations. That inconsistency matters because cropping can remove the very detail that earns a click or comment.
A mobile-first workflow starts with three questions:
- What must the viewer notice first? Use a shape that gives that element enough room.
- Where will the content be consumed? Portrait and square formats generally give mobile viewers more visual presence.
- What action should follow? A click-focused link image needs different composition from a discussion-led text post or a short demonstration video.
If you want the sizing decision to support a broader publishing system, this LinkedIn posting strategy guide is a useful companion. The core lesson is simple: pixels affect presentation, but the objective determines which pixels you should choose.
Understanding Text Specs and Length Limits on LinkedIn
Every LinkedIn post starts with the same constraint, whether it includes a graphic, video, document, or no media at all. LinkedIn's current standard post text limit is 3,000 characters, according to LinkedIn Help's official post guidance.
That ceiling gives creators room for short updates, moderate thought leadership, and text-heavy announcements. It doesn't mean every post should approach the limit. The visible preview often truncates much earlier, so the opening lines carry the burden of earning the reader's attention before the rest of the copy appears.
LinkedIn's expansion from 1,300 characters to 3,000 characters in June 2023, noted in the same guidance, changed what creators could publish. Longer narratives became possible, but the shift didn't remove the need for tight openings. A longer post with a weak first paragraph still loses readers before the extra space becomes useful.
Match length to the job
Short-form updates work well when the point is immediate. State the observation, give enough context to make it credible, and finish with a focused question or action.
Moderate-length thought leadership needs stronger structure. Use short paragraphs, deliberate line breaks, and a clear progression from problem to insight to implication. Keep the most valuable idea near the beginning rather than hiding it after several setup paragraphs.
Text-heavy announcements need practical details, but readers still need a reason to continue. Lead with the change, explain who it affects, and place the next step where it's easy to find.
A useful drafting sequence is:
- Write the complete argument.
- Move the main claim into the opening lines.
- Remove repeated context.
- Add line breaks where the reader needs a pause.
- Put the CTA after the value, not before it.
The LinkedIn post formatting guide can help turn that structure into a repeatable template. Treat 3,000 characters as an outer boundary, not a target. The best length is the amount of copy required to make the point clearly while preserving momentum.
Image Formats and Dimensions That Perform
The right image size depends on the job, not on a universal template. Square is the reliable all-rounder, horizontal suits link-oriented or wide compositions, and portrait usually gives mobile-first posts more space in the feed.
Sizing guidance places supported aspect ratios between 3:1 and 4:5, with a minimum image size of 552 × 276 pixels. Those limits describe what LinkedIn can accept, not what will present well. For professional creative, use a working canvas of at least 1080 pixels wide. 1080 × 1350 pixels is a strong choice for portrait feed content because it creates more vertical presence without making the design wider. The LinkedIn image size guidance from Jan van Musscher also supports that portrait-oriented approach.
| Format | Recommended Size | Aspect Ratio | Best For |
|---|---|---|---|
| Square | 1080 × 1080 px | 1:1 | Reusable graphics, carousels, balanced feed visuals |
| Wide | Around 1200 × 627 px | Wide format | Link previews and wide screenshots |
| Portrait | 1080 × 1350 px | 4:5 | Mobile-first posts, diagrams, text-led visuals |
Square is the safest production default
Choose 1080 × 1080 when one template needs to handle a quote card, checklist, product image, or multi-image sequence. Its balanced frame makes repurposing easier because the composition does not depend on a narrow crop.
Square also works well for carousels. Keeping every slide at the same dimensions gives the document a deliberate structure, particularly when slides contain text or interface screenshots. If you are adapting visuals from Instagram, RevelRaw's Instagram export tips offer useful guidance for preserving clarity during export. LinkedIn's final canvas should still determine the design.
Wide images still have a specific role
The familiar 1200 × 627 format remains useful for link previews and wide visual narratives. Use it when the source material is already horizontal, such as a website screenshot, dashboard, presentation slide, or timeline.
It is less effective as a universal mobile format. A wide frame gives the message less vertical room, and small type becomes harder to read while users scroll. Choose it because the content needs width, not because it is an old default.
Portrait earns attention through presence
A 1080 × 1350 portrait image is often the strongest starting point for a mobile-first feed post. The taller frame gives a headline, chart, or step-by-step visual more room before the viewer scrolls. Keep important text and logos away from the extreme edges, since LinkedIn may display assets differently across feed contexts.
Use the LinkedIn photo resizer when an existing asset needs a controlled conversion instead of an arbitrary crop. The goal is not the largest possible upload. Preserve the message hierarchy in the format your audience will see.
Video Upload Specs and Encoding Recommendations
LinkedIn's native video rules allow a wide technical envelope. Regular feed uploads can run from 3 seconds to 10 minutes on a Company Page, while desktop uploads from personal profiles can reach 15 minutes. Reported file sizes range from 75 KB to 5 GB, and supported resolutions range from 256 × 144 to 4096 × 2304 pixels, according to Moonb's LinkedIn video specifications.
Those are platform limits, not production targets. A file close to the maximum may upload successfully but still create slow processing, unnecessary compression, or a poor viewing experience on mobile networks.
Pick a practical resolution
For most feed videos, these three targets are reliable:
- 1080 × 1080, 1:1, for a balanced square presentation.
- 1920 × 1080, 16:9, for interviews, screen recordings, presentations, and other wide footage.
- 1080 × 1350, 4:5, for mobile-first videos that need more feed real estate.
Square and portrait formats make captions, faces, demonstrations, and product details easier to see in a scrolling feed. The horizontal format remains the better fit when cropping would damage the content, especially in screen recordings where the full width matters.
Compress for playback, not vanity
A larger file doesn't automatically produce a better post. Export a clean master, then create a feed-ready version that preserves readable text and stable motion without carrying unnecessary data. Keep the opening visually clear, because viewers may encounter the video while scrolling with sound disabled.
For a separate practical walkthrough on publishing native video, RemotionAI's LinkedIn video guide offers useful workflow context. If your footage starts as a vertical clip, the vertical video dimensions guide can help you decide whether to preserve a portrait frame or recompose it for 4:5.
Choosing the Right Format for Your LinkedIn Goal
The right LinkedIn posts sizes decision starts with the outcome, not the asset you happen to have on your laptop. A strong visual can still underperform when its shape makes the message difficult to scan or the CTA easy to miss.
For discovery and brand awareness
Choose a portrait image when the post depends on stopping a mobile scroll. This works especially well for a bold point, visual checklist, event announcement, or simple diagram. The taller canvas gives your brand and message more room without forcing tiny type.
Square is the better choice when the same creative needs to work across several platforms or become the first slide of a carousel. It gives you a predictable composition and fewer adaptation problems.
For thought leadership
Use text when the insight itself should drive the conversation. Add a document post when the idea benefits from sequence, examples, or visual explanation. A long-form text post can establish a point of view, while a document can turn that point of view into a framework readers can move through.
Human voice matters more than formatting polish. If AI assists with drafting, a proven LinkedIn humanizer workflow can help you review rhythm, specificity, and whether the post sounds like a person with firsthand experience.
For clicks and action
Use an image when the post supports an external link preview or a wide screenshot. Use video when demonstrating a product, explaining a process, or showing the outcome behind the CTA. In either case, make the first visual and opening sentence answer the same question: why should the viewer continue?
A simple decision shortcut works well:
- Need attention? Start with portrait.
- Need repeatable design? Start with square.
- Need context or a click? Consider a wider format.
- Need demonstration or personality? Use native video.
Common LinkedIn Post Mistakes That Hurt Reach
A technically valid post can still lose attention before the message is read. Older size advice often favors horizontal layouts, while current mobile-first practice gives square and 4:5 portrait formats more room in the feed. The format should follow the goal: use portrait for visibility, square for flexible reuse, and a wider canvas only when the content needs horizontal space.
Mistake one, designing for desktop first
A wide graphic can look polished in a design tool and still underperform in the feed when its type becomes unreadable on a phone. Correction: preview the post at mobile size, enlarge the central idea, and remove decorative elements that compete with it.
Mistake two, uploading the minimum
The minimum supported image size is not a reliable production target. An undersized file can lose sharpness when LinkedIn renders it in the feed. Correction: start with a high-resolution source. Expert guidance recommends 1080 pixels wide or higher, followed by an export that keeps text crisp and readable.
Mistake three, trusting the upload envelope
Passing LinkedIn's technical limits does not guarantee a good viewing experience. A large video may process slowly, while aggressive compression can soften text, faces, or product details. Correction: choose a practical square, 16:9, or 4:5 format, then watch the final export before publishing. Check the opening seconds and confirm that the main visual remains clear without sound.
Mistake four, hiding the value below the preview
The 3,000-character limit allows room for context, but the opening lines determine whether readers expand the post. Correction: define the takeaway first, write the hook around it, and place the useful point near the top. Background, qualifications, and supporting detail can follow after the reader has a reason to continue.
Pre-publish check
- Canvas: Does the format support the post's goal?
- Hierarchy: Is the main point clear at phone size?
- Crop: Are text and logos safely positioned?
- Playback: Does the video remain understandable without sound?
- Preview: Have you checked the final post on desktop and mobile?
Next Steps to Publish Confidently on LinkedIn
LinkedIn post sizing is now a mobile-first, goal-driven choice, not a universal rule. Use portrait when feed presence matters, square when flexibility matters, and wide format when the content itself depends on width. Treat the platform's technical limits as guardrails, then choose a smaller practical range that protects clarity and playback.
Audit your recent posts and note where the format helped or restricted the message. Pick one format to test next, prepare a reusable template, and use a workflow that lets you schedule posts on LinkedIn after previewing the final creative.
SleekPost lets you schedule and publish LinkedIn content from a single dashboard, with platform-specific copy and media customization for images, videos, carousels, and text updates. Visit SleekPost to streamline your sizing, batching, and publishing workflow without adding unnecessary complexity.