Bluesky Image Sizes 2026
All the image sizes you need for Bluesky, updated for 2026.
Last updated: April 2026
Size Reference
| Usage | Dimensions | Aspect Ratio | Category |
|---|---|---|---|
| Post | 1200 x 675 | 16:9 | Post |
| Profile | 400 x 400 | 1:1 | Profile |
| Banner | 1500 x 500 | 3:1 | Cover |
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Resize for BlueskyDetailed Guide for Each Size
Post
- Recommended size:
- 1200 x 675 px
- Aspect Ratio:
- 16:9
- Max file size:
- 1MB
- Supported formats:
- JPEG, PNG, WebP
Tips: Use high-resolution images for Bluesky feed posts to maintain clarity after compression. Upload at or above the recommended size for best results.
Profile
- Recommended size:
- 400 x 400 px
- Aspect Ratio:
- 1:1
- Max file size:
- 1MB
- Supported formats:
- JPEG, PNG, WebP
Tips: Profile images are often cropped to a circle. Center your subject and upload a square image for best results.
Banner
- Recommended size:
- 1500 x 500 px
- Aspect Ratio:
- 3:1
- Max file size:
- 1MB
- Supported formats:
- JPEG, PNG, WebP
Tips: Cover images display differently across devices. Keep important elements toward the center to ensure they are visible on all screen sizes.
Frequently Asked Questions
What are the recommended image sizes for Bluesky?
Bluesky image sizes vary by usage. See the size reference table above for recommended dimensions for posts, stories, profiles, and more.
Why do my Bluesky images lose quality after uploading?
Bluesky automatically compresses images on upload. Use high-resolution images at or above the recommended size and set JPEG quality to high to minimize quality loss.
Can I resize images for Bluesky for free?
Yes, ShareMint lets you resize to all Bluesky sizes for free. Everything runs in your browser — your images are never sent to a server.
What image format should I use for Bluesky?
JPEG is the most common and widely compatible format. Use PNG if you need transparency. WebP offers smaller file sizes with good quality but may not be supported everywhere.