What is the recommended banner size for Bluesky?

1500 × 500 pixels, a 3:1 ratio. Bluesky publishes no pixel size, but the app crops banners to 3:1 and keeps the file under 1 MB, so any 3:1 PNG or JPEG of that size or larger works.

What image size is best for Bluesky?

There is no single size: Bluesky shows photos in their own shape. Keep them under 2 MB and 4000 × 4000 px. For one photo, 4:5 portrait such as 1600 × 2000 takes the most room in the phone feed.

How many images per post on Bluesky?

Up to 10 photos since June 2026, up from 4. Posts with 5 or more show as a carousel. A post holds photos or one video, not both.

What is the Bluesky profile picture size?

Bluesky publishes no size. The photo shows as a circle and must be a PNG or JPEG under 1 MB; 1000 × 1000 pixels is plenty, and the app shrinks bigger files.

What is the Bluesky image file size limit?

2 MB per photo in posts since April 2026, up from 1 MB. Profile photos, banners and link card images are still capped at 1 MB.

Why does Bluesky crop my photo?

Photos taller than 1:2 are cropped in the feed, posts with 2 to 4 photos show cropped tiles, and carousel photos are kept between 2:3 and 3:2. Opening the photo shows it whole.

What aspect ratio does Bluesky use?

None is required. Single photos keep their own ratio up to 1:2 tall. The banner is 3:1, the profile photo 1:1, and link cards 1.91:1.

What size is a Bluesky link preview image?

Bluesky shows link cards at 1200:630, about 1.91:1, so a 1200 × 630 og:image fits. The card image is capped at 1 MB.

Can OmniSocials post 10 photos to Bluesky?

Yes. OmniSocials posts up to 10 photos per Bluesky post: 1 to 4 as a grid and 5 to 10 as a gallery. It compresses each one to fit the 2 MB limit and keeps its shape.

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Bluesky image sizes and banner size for 2026

Bluesky shows photos in their own shape, up to 2 MB and 4000 × 4000 px, and up to 10 in a post. The banner is 3:1, 1500 × 500 works well, and both profile images stay under 1 MB.

Start Free Trial Read the short answer

Checked on October 17, 2026 against 8 sources.

In a 2-photo post, the feed shows the center square

Portrait 4:5

Use it for: Single photos
In the app: Shows whole, up to 2 MB
Via schedulers: Yes, 2 MB cap
Note: Fills the most of a phone screen

The short answer

Any shape works. Keep photos under 2 MB and 4000 × 4000 px.

Bluesky publishes no pixel size for posts. Since April 2026 a photo can be up to 2 MB and 4000 × 4000 px, and since June 2026 a post can hold up to 10 photos. A single photo shows in its own shape, from wide panoramas up to 1:2 tall; taller ones are cropped in the feed. For one photo, 4:5 portrait fills the most of a phone screen.

Posts with 2 photos show two squares, 4 photos show 3:2 tiles, and 5 or more scroll as a carousel. The banner is 3:1, and 1500 × 500 is the size most guides use; the profile photo shows as a circle. Both are capped at 1 MB. Schedulers send photos through the same post format, so the 2 MB cap applies to them too.

Photo file: 2 MB; Up to 4000 × 4000 px, since April 2026
Banner: 1500 × 500; 3:1, up to 1 MB
Photos per post: 10; Since June 2026; 4 before

Every size

Every Bluesky size in one table. In pixels, width × height.

Bluesky image and video sizes in pixels with aspect ratios and file limits, October 2026
Format	Size (px)	Aspect ratio	Notes
Portrait photo	1600 × 2000	4:5	Our pick for a single photo; up to 2 MB
Square photo	2000 × 2000	1:1	Shows whole in every layout
Landscape photo	2000 × 1125	16:9	4-photo posts crop each to 3:2
Tall photo	1000 × 2000	1:2	The tallest the feed shows uncropped
Banner	1500 × 500	3:1	PNG or JPEG, up to 1 MB
Profile photo	1000 × 1000	1:1	Shows as a circle; PNG or JPEG, up to 1 MB
Link card image	1200 × 630	1.91:1	Up to 1 MB
Video	1080 × 1920	Any, 9:16 shown	Up to 10 minutes and 300 MB

Pixel sizes are our picks: Bluesky publishes none for posts, the banner or the profile photo. The limits come from Bluesky's announcements, its post format and its open-source app, read on October 17, 2026.

App vs schedulers

What the app allows, and what a scheduled post must fit. Schedulers post through Bluesky's API.

Bluesky image and video limits in the Bluesky app compared with the post format that scheduling tools publish through
Limit	Bluesky app	Schedulers (the API)
Photos per post	Up to 10	10 in the gallery format, 4 in the older images format
Photo file	2 MB; bigger photos are compressed	2 MB; bigger files are rejected
Photo size	Up to 4000 × 4000 px	No pixel limit in the format; the 2 MB cap still applies
Banner and profile photo	Cropped, kept under 1 MB	PNG or JPEG, up to 1 MB
Alt text	2,000 characters	No cap in the post format
Video	10 minutes, 300 MB	300 MB in the post format

Every scheduler, OmniSocials included, publishes through Bluesky's API, so the right column is what a scheduled post must fit. OmniSocials posts up to 10 photos per Bluesky post (5 or more as a gallery), compresses each one under 2 MB and sends its shape, and takes video up to 10 minutes and 300 MB.

What changed

What changed for image sizes. Bigger photos, more of them.

Jun 2026
Up to 10 photos per post
Version 1.123 raised the limit from 4 to 10 photos. Posts with 5 or more photos show as a carousel. Source
Jun 2026
Video files up to 300 MB
Bluesky "bumped the video upload limit from 100MB to 300MB". Source
Apr 2026
2 MB photos at up to 4000 px
Version 1.121 doubled the photo file limit to 2 MB and raised the resolution limit to 4000 × 4000. Source

Tips

Size it once, post it anywhere. Six rules that cover most posts.

Keep each photo under 2 MB
The app compresses bigger photos; through the API they are rejected. A JPEG of 2,000 px on the long side usually fits well under.
Use 4:5 for a single photo
It shows whole and takes more of a phone screen than a square or a wide photo.
Use squares for 2 or 3 photos
The feed crops a 2-photo post to two squares and a 3-photo post to a square plus two smaller tiles. Square photos lose nothing.
Stay at 1:2 or wider
The feed crops anything taller than 1:2. Opened, a post shows up to 1:4, but most people see the feed version.
Export banners at 3:1
The app crops the banner to 3:1 and keeps it under 1 MB. Start from 1500 × 500 or larger so the crop does not surprise you.
Add alt text to every photo
Bluesky shows an ALT badge on described photos, and the app takes up to 2,000 characters per image.

Publishing

Upload any photo. OmniSocials compresses it to fit Bluesky's 2 MB and keeps its shape.

Compress to 2 MB
Shape Kept
Alt Text

Link Cards
Threads
and more

Other platforms

The same guide for every network. Each one has its own rules.

Sources

How we built this guide. Checked on October 17, 2026.

Every limit on this page comes from Bluesky's own announcements, its post format (the app.bsky lexicons) or its open-source app, read on October 17, 2026. Bluesky publishes no pixel sizes, so the frame sizes are our picks and labelled as such. How the feed crops photos comes from the app's code. Bluesky's developer docs still list 4 images and 1 MB per image, older than the current format.

@bsky.app on Bluesky: Version 1.121: 2 MB photos and 4000 × 4000Apr 22, 2026
@bsky.app on Bluesky: Version 1.123: up to 10 photos in postsJun 8, 2026
@bsky.app on Bluesky: Video upload limit raised to 300 MBJun 4, 2026
Bluesky on GitHub: app.bsky.embed.images and app.bsky.embed.gallery lexiconsRead Oct 20264 images or a gallery of up to 20 (10 in apps), 2,000,000 bytes per image.
Bluesky on GitHub: app.bsky.actor.profile lexiconRead Oct 2026Avatar and banner: PNG or JPEG, up to 1,000,000 bytes.
Bluesky social-app on GitHub: AutoSizedImage and ImageLayoutGrid (feed photo layout)Read Oct 20261:2 crop in feeds, 1:4 in threads, square and 3:2 tiles, 2:3 to 3:2 carousel.
Bluesky social-app on GitHub: UserBanner (3:1 banner crop) and constants (image size config)Read Oct 2026
Bluesky developer docs: Posts in-depthRead Oct 2026Still says up to 4 images of 1,000,000 bytes.

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Last updated: October 18, 2026

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Bluesky image sizes and banner size for 2026

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