Bluesky Image Sizes, Video Limits and Post Length

Bluesky sets its limits in bytes, not pixels. A post holds up to 10 photos of 2 MB each, or one video of up to 10 minutes and 300 MB, plus 300 characters of text. Profile pictures and banners must be 1 MB or less.

Checked against each platform's help pages on 5 November 2026.

The short answer

Post text: 300 characters
Photos per post: Up to 10 (4 in apps that haven't updated)
Photo file size: 2 MB each, up to 4000 × 4000 px
Video: 1 per post, up to 10 minutes and 300 MB
Profile picture: Square, PNG or JPEG, up to 1 MB
Banner: 3:1 (1500 × 500 px), PNG or JPEG, up to 1 MB
Alt text: 2,000 characters

Bluesky image sizes and file limits

Bluesky publishes no pixel sizes. What it enforces is a file size: 2 MB for each photo in a post and 1 MB for a profile picture or banner. Since the April 2026 update the app keeps post photos up to 4000 pixels on the longest side; larger ones are scaled down and compressed until they fit.

A photo keeps its own shape in a post: the post stores each photo's aspect ratio, so portraits, squares and panoramas all work. Profile pictures are cropped square and shown as a circle; banners are cropped to 3:1.

Bluesky image limits
Image	Shape	File limit	Largest the app keeps
Post photo	Any	2 MB each	4000 px longest side
Profile picture	Square, shown as a circle	1 MB, PNG or JPEG	2000 px
Banner	3:1 (1500 × 500 px is common)	1 MB, PNG or JPEG	2000 px wide

File limits from Bluesky's lexicons (app.bsky.embed.images, app.bsky.actor.profile); pixel caps from the Bluesky app's source and its v1.121 release post. A file limit of 2 MB is 2,000,000 bytes.

Resize a photo to a custom size before postingResize one photo or a whole batch for any post, story, banner or profile picture, with crop, blur or border.

How many photos you can post

Since version 1.123 (8 June 2026) the Bluesky app lets you attach up to 10 photos to a post. Posts with 1 to 4 photos are saved the old way and shown as before; posts with 5 or more are saved in a newer "gallery" format and shown as a swipeable carousel.

Apps and scheduling tools that only know the older format still stop at 4 photos. Post Utils' own scheduler posts up to 4 for that reason. A post holds photos or a video, not both.

Bluesky profile picture and banner

Both must be PNG or JPEG and 1 MB or smaller. The app crops the banner to 3:1 and the profile picture to a square, and shrinks either to 2000 px if it's bigger. 1500 × 500 px is the banner size most people use; it is 3:1 and a JPEG of it fits under 1 MB easily.

The profile picture sits over the lower left of the banner, and the web profile shows a shorter strip of the banner than the app does, so keep text in the middle and to the right. Those positions aren't published; they're the Banner Maker's estimates from the current layouts.

Bluesky profile images
Image	Upload	Limit	How it's shown
Banner	1500 × 500 px	1 MB, PNG or JPEG	Cropped to 3:1 in the app; a shorter strip on the web
Profile picture	Any square, e.g. 1000 × 1000 px	1 MB, PNG or JPEG	Circle, over the lower left of the banner

Make a Bluesky banner that fits under 1 MBYouTube, Facebook, LinkedIn and X banners from your photo, with every device's crop and safe area marked.

Bluesky video length and file size

A post can carry one video of up to 10 minutes and 300 MB. Bluesky raised the file limit from 100 MB to 300 MB in June 2026 and the length from 3 to 10 minutes on 25 August 2026, so guides written before then still quote the old figures.

Bluesky also limits how many videos and how many bytes each account can upload per day. The app checks your remaining allowance before uploading; Bluesky doesn't publish the figures.

Bluesky video limits
Limit	Figure
Length	Up to 10 minutes
File size	Up to 300 MB
Videos per post	1, without photos
Files the app takes	MP4, MOV, WebM, MPEG or GIF (stored as MP4)
Captions	Up to 20 subtitle files (.vtt), 20 KB each
Daily uploads	Limited per account; the figure isn't published

From Bluesky's video lexicon (app.bsky.embed.video), the app's source, and @bsky.app's posts of 4 June and 25 August 2026.

Turn photos into an MP4 video for BlueskyTurn photos and a song into a 9:16 video for Reels, TikTok and Shorts, with captions, zoom and crossfades.

Post length and alt text

A Bluesky post holds 300 characters, counted as you see them: an emoji counts as one, however it's stored. For more, split the text into a thread. Names, bios and hashtags are in the Social media character limits guide.

Each photo and video can carry alt text of up to 2,000 characters in the Bluesky app.

Count a post against Bluesky's 300Live counts against every platform's limit: X, Instagram, TikTok, LinkedIn, YouTube and more.

What changed in 2026

22 April (app v1.121): photo limit doubled from 1 MB to 2 MB, and photos kept up to 4000 × 4000 px.
4 June: video file limit raised from 100 MB to 300 MB.
8 June (app v1.123): up to 10 photos per post, up from 4.
25 August: videos up to 10 minutes, up from 3, with faster uploads.

Frequently asked questions

What size should a Bluesky image be?

There is no required size. Any shape works, the file must be 2 MB or less, and the app keeps up to 4000 px on the longest side. A JPEG 1080 to 2000 px wide looks sharp on phones and stays well under the limit.

How many photos can you post on Bluesky?

Up to 10 in the Bluesky app since June 2026. Apps and schedulers that haven't adopted the newer gallery format still stop at 4.

How long can a Bluesky video be?

Up to 10 minutes and 300 MB, one per post. Older guides say 3 minutes and 100 MB, the limits before June and August 2026.

What is the Bluesky banner size?

Bluesky publishes no pixel size: the banner must be a PNG or JPEG of 1 MB or less, and the app crops it to 3:1. 1500 × 500 px is the usual choice.

Why does Bluesky say my image is too large?

The file is over the limit: 2 MB for a post photo, 1 MB for a profile picture or banner. The Bluesky app shrinks big photos itself, so the error mostly comes from other apps and tools. Save as JPEG rather than PNG, or make it smaller.

What is the Bluesky character limit?

300 characters per post, with each emoji counted as one. Bios hold 256 and display names 64.