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Format guide · 2026
The complete Bluesky video format and upload specification guide for 2026.
| Quality | Dimensions | |
|---|---|---|
| Landscape HD | 1920×1080 | Recommended |
| Vertical | 1080×1920 | Recommended |
| Square | 1080×1080 |
| Recommended container | MP4 |
| Video codecs | H.264 |
| Audio codecs | AAC |
| Aspect ratios | 16:9 (landscape), 1:1 (square), 9:16 (vertical) |
| Frame rates | Up to 60 fps |
| Minimum resolution | 1080×1920 or 1920×1080 recommended |
| Recommended resolution | 1920×1080 (16:9) or 1080×1920 (9:16) |
| Maximum file size | 50 MB |
| Maximum duration | Up to 60 seconds |
50 MB is a tight file size limit — export at a lower bitrate (around 4–8 Mbps) to stay under it
Short clips (under 30 seconds) are most common on Bluesky and perform well in the feed
Bluesky's decentralized community skews toward tech, journalism, and creator-economy niches — content that performs there differs from TikTok or Instagram
Synchro is one of the few tools with native Bluesky video upload support via the AT Protocol API
What is the best video format for Bluesky?
MP4 with H.264 codec is the recommended format for Bluesky video. Keep file size under 50 MB (Bluesky has a strict limit) and video length under 60 seconds. Export at a lower bitrate (4–8 Mbps for 1080p) to meet the size limit.
What is the maximum video size on Bluesky?
Bluesky has a 50 MB file size limit for video uploads. This is significantly lower than other platforms. To stay within the limit, compress your video before uploading — aim for 4–8 Mbps bitrate at 1080p resolution.
How do I upload a video to Bluesky automatically?
Bluesky uses the AT Protocol API for video uploads. Synchro connects directly to this API, letting you upload your video once and publish to Bluesky alongside YouTube, TikTok, Instagram, and other platforms simultaneously.
Synchro uploads your video to Bluesky and up to 7 other platforms simultaneously — free to start, no credit card required.
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