Bluesky

Overview

Bluesky supports images and videos with automatic compression for oversized files.

Image Requirements

Automatic Compression

Bluesky has a 1 MB blob limit. Late automatically compresses images that exceed this:

1. Quality reduction (maintaining visual quality)
2. Resolution scaling if needed
3. Original files preserved

You don't need to pre-compress - Late handles it automatically.

Image Example

{
  "content": "Beautiful sunset tonight! 🌅",
  "mediaItems": [
    { "url": "https://example.com/sunset.jpg" }
  ],
  "platforms": [
    { "platform": "bluesky", "accountId": "acc_123" }
  ]
}

Multi-Image Post

{
  "content": "Photo dump from my trip",
  "mediaItems": [
    { "url": "https://example.com/photo1.jpg" },
    { "url": "https://example.com/photo2.jpg" },
    { "url": "https://example.com/photo3.jpg" },
    { "url": "https://example.com/photo4.jpg" }
  ],
  "platforms": [
    { "platform": "bluesky", "accountId": "acc_123" }
  ]
}

Video Requirements

Video Example

{
  "content": "Quick tutorial on making coffee ☕",
  "mediaItems": [
    { "url": "https://example.com/coffee-tutorial.mp4" }
  ],
  "platforms": [
    { "platform": "bluesky", "accountId": "acc_123" }
  ]
}

Link Previews

When posting text with URLs and no media, Bluesky auto-generates link preview cards:

{
  "content": "Check out this article! https://example.com/article",
  "platforms": [
    { "platform": "bluesky", "accountId": "acc_123" }
  ]
}

The preview card shows:

• Page title
• Description
• Thumbnail image (from Open Graph tags)

Note: Link previews only appear when no media is attached.

Alt Text

Add accessibility descriptions to images:

{
  "mediaItems": [
    { 
      "url": "https://example.com/sunset.jpg",
      "altText": "Orange and pink sunset over the ocean with silhouetted palm trees"
    }
  ]
}

GIF Support

Bluesky supports animated GIFs:

• Auto-play in feed
• Compressed to ~1 MB if larger
• Counts toward 4-image limit

Text Limits

Note: Bluesky counts graphemes, not bytes. Emojis count as 1 character.

Common Issues

"Image too large"

Late auto-compresses, but extremely large images (>10 MB original) may fail. Pre-resize to under 4000 × 4000 px.

"Too many images"

Maximum 4 images per post. Split into multiple posts if needed.

Link preview not showing

• Preview only appears without media
• Ensure URL has Open Graph meta tags
• Some sites block preview generation

Video rejected

• Check duration (≤60 seconds)
• Use MP4 format
• Keep under 50 MB

Post text truncated

Bluesky has a 300 character limit. URLs count toward this limit. Consider:

• Shortening text
• Using link previews (no media) to show full URLs nicely