400 Bad Request
LinkedIn could not parse or validate the request URL or body.
Fix: Check the JSON, URNs, required fields, and the current Posts API examples.
LinkedIn sizes, specs, and posting limits
LinkedIn accepts up to 20 photos or GIFs, or one MP4 video. An image must contain fewer than 36,152,320 pixels. PublishQ automatically resizes very high-resolution images to fit.
Updated July 2026
Recommended sizes
Good defaults for LinkedIn
Use these sizes when you need a sensible default. The tables below cover the limits enforced by the API.
Square image
1200×1200 (1:1)
A good size for profile and company-page image posts.
Official pixel ceiling
<36,152,320 pixels
Width multiplied by height must stay below this value.
Large images
Any resolution
PublishQ reduces larger static images before publishing.
API limits
LinkedIn API specifications
Check these values in your upload validator or before an agent submits a post.
Photo and GIF limits
LinkedIn image requirements for profiles and company pages.
- Formats
- JPEG, PNG, GIF
- Maximum file size
- 20 MB each
- Maximum per post
- 20 images or GIFs
- Maximum pixel count
- 36,152,319 pixels
Video and text limits
Constraints for LinkedIn video and copy.
- Video format
- MP4
- Video file size
- 75 KB–5 GB
- Video duration
- 3 seconds–30 minutes
- Post text
- 3,000 characters
Common publishing errors
LinkedIn publishing errors
Find the returned code or the closest matching failure below, then fix the cause before retrying the post.
401 Unauthorized
The OAuth token is missing, invalid, expired, or revoked.
Fix: Refresh or reconnect the LinkedIn account and send the token as a Bearer credential.
403 Access Denied
The token lacks a required scope or the member cannot administer the target page.
Fix: Request the publishing scope and verify access to the person or organization URN.
429 Rate Limit
LinkedIn’s resource-level throttle limit has been reached.
Fix: Reduce duplicate calls and retry after the rate window resets.
422 Duplicate Content
LinkedIn found the same or very similar content in an earlier post from this account.
Fix: Rewrite the post rather than making a small wording change. LinkedIn can reject lightly rephrased duplicates too.
Cannot mix media types (400)
The post combines images and video in a media arrangement LinkedIn does not accept.
Fix: Choose one media mode supported by PublishQ: an image set or one video.
PROCESSING_FAILED
LinkedIn accepted the video upload but could not finish processing it.
Fix: Re-encode the video as H.264 MP4 and check its duration, frame rate, and aspect ratio before uploading again.
Why LinkedIn uploads fail
- An image upload reports success, but an extreme pixel count prevents the post from appearing.
- A post mixes images with video instead of using one supported media mode.
- A video is not MP4 or falls outside the 75 KB, 3-second, or 30-minute bounds.
What PublishQ handles
- Prepares each image into the best version LinkedIn accepts, converting the format, resizing high-resolution photos that exceed LinkedIn’s limits, and compressing oversized images, so you never have to edit a photo first.
- Validates image/video exclusivity and LinkedIn file constraints.
- Supports both personal profiles and administered company pages through one posting API.
For developers and agents
Publish to LinkedIn through one API
Send PublishQ the post. We check it, prepare the media, and deliver it to LinkedIn. You can work in the dashboard or connect through the API, CLI, or MCP server.
Compare other platform limits
YouTube limits
TikTok limits
X (Twitter) limits
Instagram limits
Facebook limits
Threads limits
Bluesky limitsFrequently asked questions
Common questions about LinkedIn media sizes and API publishing limits.
What is LinkedIn’s maximum image resolution?
LinkedIn requires fewer than 36,152,320 total pixels. PublishQ automatically resizes very high-resolution images to fit.
How many images can a LinkedIn post contain?
A LinkedIn post can contain up to 20 JPEG, PNG, or GIF images, each up to 20 MB. Images cannot be mixed with video.
Can an AI agent publish LinkedIn posts with PublishQ?
Agents and scripts can send posts to profiles and company pages through the PublishQ API or MCP server. PublishQ prepares the media before delivery.
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