How many images can I post on Bluesky?

Up to 4 in one post, or one video — not both.

What is the Bluesky image size limit?

2 MB per image (it was 1 MB). The app shrinks larger images to 4,000 px on the long side.

What is the Bluesky character limit?

300 characters, counted as you see them — an emoji is one.

BLUESKY · SIZES AND SPECS

Bluesky sizes,
checked for 2026.

Four images or one video, never both. Images to 2 MB, video to 10 minutes and 300 MB, any shape, and 300 characters. Read from Bluesky's own code.

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

THE SHORT ANSWER

A Bluesky post takes up to 4 images or one video, not both. Images can be up to 2 MB each — the app shrinks larger ones to 4,000 px on the long side — and keep their own shape. Video can be MP4, MOV, WebM or MPEG, up to 10 minutes and 300 MB (raised from 3 minutes and 100 MB). Text is 300 characters, counted as you see them.

Images

Images in one post: Up to 4Or one video — not both.
File: Up to 2 MB eachIt was 1 MB. The app shrinks a larger image to 4,000 px on the long side.
Shape: AnyA post keeps the image's own shape.
Size we recommend: 1080 × 1350 (4:5)

Video

Limit: Up to 10 min · up to 300 MBRaised from 3 minutes and 100 MB. A scheduling tool's path may still lag behind the app.
File: MP4, MOV, WebM or MPEGStored as MP4.

Text

Post: 300 charactersCounted as you see them — an emoji is one.

What works on Bluesky.

Pick the best four slides of a carousel — that is all a post takes.
Save images as JPEG so they stay under 2 MB.
Write a 300-character version; don't let a long post be cut mid-thought.
Lead with the point and keep one link.

WITH PAPERFLIGHT

A Bluesky version of every post, inside 300.

PaperFlight draws feed posts at 1080 × 1350 (4:5) and full-screen video at 1080 × 1920 (9:16).
A slide post is cut to the four images Bluesky takes, in order.
The Writer writes Bluesky its own 300-character caption, your sign-off included.
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.

How many images can I post on Bluesky?: Up to 4 in one post, or one video — not both.
What is the Bluesky image size limit?: 2 MB per image (it was 1 MB). The app shrinks larger images to 4,000 px on the long side.
How long can a Bluesky video be?: Up to 10 minutes and 300 MB, raised from 3 minutes and 100 MB.
What is the Bluesky character limit?: 300 characters, counted as you see them — an emoji is one.

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 Bluesky 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.

Bluesky sizes,checked for 2026.