Image Specs
Post Image
| Dimensions | Up to 2000 × 2000 px |
|---|---|
| Max File Size | 1 MB per image |
| File Formats | JPG, PNG, GIF, WEBP |
| Notes | Up to 4 images per post; GIF animations are supported |
Profile Photo
| Dimensions | 1000 × 1000 px recommended |
|---|---|
| Max File Size | 1 MB |
| File Formats | JPG, PNG, WEBP |
| Notes | Displayed as a circle |
Profile Banner
| Dimensions | 3000 × 1000 px recommended |
|---|---|
| Aspect Ratio | 3:1 |
| Max File Size | 1 MB |
| File Formats | JPG, PNG, WEBP |
[Ad]
Video Specs
Post Video
| Max File Size | 50 MB |
|---|---|
| File Formats | MP4, MOV, WEBM |
| Resolution | Up to 1920 × 1080 px |
| Max Duration | Up to 60 seconds |
| Notes | H.264 codec recommended; plays inline in the feed |
Text & Character Limits
Post
| Character Limit | 300 characters |
|---|---|
| Notes | URLs count as 27 characters regardless of actual length |
Bio
| Character Limit | 256 characters |
|---|
Display Name
| Character Limit | 64 characters |
|---|
Handle
| Character Limit | 253 characters |
|---|---|
| Notes | In the format user.bsky.social or a custom domain; 3 characters minimum |
Alt Text
| Character Limit | 1,000 characters |
|---|---|
| Notes | Alt text for images; strongly encouraged for accessibility |
Profile Assets
Avatar
| Dimensions | 1000 × 1000 px recommended |
|---|---|
| Max File Size | 1 MB |
| File Formats | JPG, PNG, WEBP |
| Notes | Displayed as a circle |
Banner
| Dimensions | 3000 × 1000 px |
|---|---|
| Aspect Ratio | 3:1 |
| Max File Size | 1 MB |
| File Formats | JPG, PNG, WEBP |
Starter Packs & Discovery
Starter Pack Name
| Character Limit | 50 characters |
|---|---|
| Notes | Curated lists of accounts and feeds for new users to follow |
Starter Pack Description
| Character Limit | 300 characters |
|---|
Feed Generator Name
| Character Limit | 64 characters |
|---|---|
| Notes | Custom algorithm feeds built on AT Protocol |