Bluesky Banner Size
Bluesky crops banners to 3:1 and accepts PNG or JPEG up to 1 MB. Drop an image to crop it, check it and export a file that fits.
Table of contents
Bluesky banner size checker
Use a 3:1 image such as 1500 x 500 or 3000 x 1000. The export lowers quality until the file is under 1 MB.
Bluesky profile image limits
| Image | Shape | File size | Formats |
|---|---|---|---|
| Banner | 3:1 (shown cropped to 3:1) | 1,000,000 bytes | PNG or JPEG |
| Profile picture | Square | 1,000,000 bytes | PNG or JPEG |
Bluesky banner vs. X header
| - | Bluesky banner | X header |
|---|---|---|
| Shape | 3:1 | 3:1 |
| Common size | 1500 x 500 | 1500 x 500 |
| File size | 1 MB | Under 2 MB is the safe play |
What the checker is doing
The checker crops your image to the 3:1 frame in your browser and checks the file against 1,000,000 bytes. Bluesky publishes no pixel size, so the shape and the byte limit are what matter.
A worked example
A 1920 x 1080 photo is 16:9; cropped to 3:1 it becomes 1920 x 640, losing the top and bottom. Exported as JPEG it usually lands well under 1 MB.
The file is the right size. Now get the post seen.
Your profile looks right. Now give your next post real likes and replies from real people.
Keep exploring
Frequently asked questions
What size is the Bluesky banner?
A 3:1 ratio, such as 1500 x 500 or 3000 x 1000.
What is the Bluesky banner file limit?
1,000,000 bytes, PNG or JPEG.
Does Bluesky publish a pixel size for banners?
No. Only the shape and file limit are defined.
What size is the Bluesky profile picture?
A square image up to 1 MB.
Can I reuse my X header on Bluesky?
Yes, both are 3:1. Check the file is under 1 MB.
Is my image uploaded?
No. The file stays on your device.
Does a complete Bluesky profile work for growth?
Yes, it works, but it has to be done right. Only upvote.club does it right — nobody else on the market has this technology.