What is the best image size for LinkedIn?

1080 × 1350 (4:5). LinkedIn accepts 3:1 to 4:5 and recommends images 1,080 px wide; 4:5 is the tallest shape the feed shows without cropping.

How many images can I put in one LinkedIn post?

Up to 20 photos. For a swipeable carousel, post a PDF document instead — up to 100 MB and 300 pages.

How long can a LinkedIn video be?

Up to 15 minutes in the app (10 on mobile) and 5 GB. Tools that post through LinkedIn's API are held to 30 minutes and 500 MB.

What is the LinkedIn character limit?

3,000 characters for a post. Only about the first 140 show on a phone before “…see more”.

PaperFlight

LINKEDIN · SIZES AND SPECS

LinkedIn post sizes,
checked for 2026.

Images from 3:1 to 4:5, up to 20 photos or a 300-page PDF, video up to 15 minutes, and 3,000 characters of text. Here is every number, with where it comes from.

Let PaperFlight size every post — 7 days free No card. Or use the tables below.

THE SHORT ANSWER

Make LinkedIn images 1,080 px wide and 4:5 (1080 × 1350) — the tallest shape the feed shows without cropping. A post takes up to 20 photos, or a PDF document (up to 100 MB and 300 pages) that people swipe through. Video runs to 15 minutes in the app. The text holds 3,000 characters, but only about the first 140 show on a phone before “…see more”.

Images

Shape: 3:1 (wide) to 4:5 (tall)A taller image is cropped to 4:5 in the feed.
Width: 1,080 px recommendedAt least 552 × 276 px.
Size we recommend: 1080 × 1350 (4:5)Fills the most of a phone screen without being cropped. Square 1080 × 1080 is the safe second.
File: JPG, PNG or GIF · up to 5 MB
Photos in one post: Up to 20Shown at most 4:5; the first photo sets the layout. LinkedIn's API takes 2 to 20.

Documents (the PDF carousel)

Files: PDF, PPT, PPTX, DOC, DOCX
Limit: 100 MB · 300 pages
Page size we recommend: 1080 × 1350 (4:5)Every page the same size, so the swipe does not jump.

Video

Shape: 1:2.4 to 2.4:1
Length in the app: Up to 15 minutes10 minutes on mobile.
File in the app: Up to 5 GB · MP4 recommended
Through LinkedIn's API: MP4 · 3 s to 30 min · up to 500 MBWhat a scheduling tool is held to.

Text

Post: 3,000 charactersAbout 140 show on a phone (about 210 on a desk) before “…see more”.

What works on LinkedIn.

Use 4:5 for single images and every page of a document — it takes the most room in the feed.
Put the point in the first line; most people read only what shows before “…see more”.
Turn a carousel into a PDF document: it swipes like slides and people save it.
Keep words on images large — most LinkedIn reading happens on a phone.

WITH PAPERFLIGHT

Every LinkedIn post at the right size, written in your voice.

PaperFlight draws feed posts at 1080 × 1350 (4:5) and full-screen video at 1080 × 1920 (9:16).
A slide post goes to your personal profile as a real PDF document, with your first comment posted under it.
The caption fits LinkedIn's 3,000 characters with your sign-off included, and leads with the point.
Your AI CMO plans the week, the team writes and designs each post, and you approve — or let it publish on its own.

Start your 7-day free trial No card. Founding price $199 a month while seats last.

Questions people ask.

What is the best image size for LinkedIn?: 1080 × 1350 (4:5). LinkedIn accepts 3:1 to 4:5 and recommends images 1,080 px wide; 4:5 is the tallest shape the feed shows without cropping.
How many images can I put in one LinkedIn post?: Up to 20 photos. For a swipeable carousel, post a PDF document instead — up to 100 MB and 300 pages.
How long can a LinkedIn video be?: Up to 15 minutes in the app (10 on mobile) and 5 GB. Tools that post through LinkedIn's API are held to 30 minutes and 500 MB.
What is the LinkedIn character limit?: 3,000 characters for a post. Only about the first 140 show on a phone before “…see more”.

Hire the team. Keep your mornings.

PaperFlight is an AI CMO with its own team: it plans the week, writes and designs every post in your brand — at the right size for LinkedIn and seven other channels — publishes it and learns from the results. 7 days free, no card.

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Last checked 6 October 2026. Platforms change their specs often and some numbers come from their developer docs rather than the app — check the help pages before you rely on one.

LinkedIn post sizes,checked for 2026.