Social Media Specs
LinkedIn Image Sizes and Video Specs (2026)
The LinkedIn specs that matter when you post: post text up to 3,000 characters, multi-image post up to 20 images in Markaestro, and a 1080 x 1080 (1:1) feed square as a safe size. Every figure below comes from LinkedIn's own documentation, checked September 2026.
Updated
LinkedIn Image and Video Sizes
| Format | Size (px) | Ratio | Note |
|---|---|---|---|
| Feed square | 1080 x 1080 | 1:1 | Markaestro suggestion within the limits. Well under LinkedIn's pixel cap; the same file works on Instagram. |
| Feed portrait | 1080 x 1350 | 4:5 | Markaestro suggestion within the limits. Also valid on Instagram, so one export covers both. |
LinkedIn Text Limits
| Spec | Limit |
|---|---|
| Post text | 3,000 characters |
LinkedIn Image Requirements
| Spec | Limit |
|---|---|
| Formats | JPG, GIF, and PNG (GIF up to 250 frames) |
| Size | Under 36,152,320 pixels |
LinkedIn Video Requirements
| Spec | Limit |
|---|---|
| Format | MP4 |
| Length | 3 seconds to 30 minutes |
| File size | 75 KB to 500 MB |
Multiple Images and Carousels
| Spec | Limit |
|---|---|
| Multi-image post | Up to 20 images in Markaestro |
How Markaestro Handles These Limits
The Markaestro composer checks LinkedIn posts against a 3,000-character caption limit and up to 20 media items while you write, and the media library accepts images up to 10 MB and video up to 250 MB. See scheduling LinkedIn posts.
Frequently Asked Questions
What size should LinkedIn posts be?
1080 x 1080 pixels (1:1) for a feed square. Well under LinkedIn's pixel cap; the same file works on Instagram.
What is the LinkedIn character limit?
Post text: 3,000 characters.
How long can a LinkedIn video be?
3 seconds to 30 minutes.
What is the LinkedIn file size limit?
75 KB to 500 MB.