Automatically Post Threads to Bluesky: Complete Guide
Set up once and automatically upload, share, and post your Threads content to Bluesky forever.
Stop manually posting to multiple platforms. Let automation handle your Bluesky distribution while you focus on creating great content.
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Threads reaches Instagram users looking for text-based discussion while Bluesky connects with Tech enthusiasts and early adopters, letting you expand to a new audience segment. Your Threads content format works on Bluesky, so you can share without creating entirely new content. Whether you want to auto-post everything or filter by hashtag, this guide covers everything about Threads to Bluesky automation. Learn how to crosspost from Threads to Bluesky or repurpose your content for maximum reach.
Threads to Bluesky Content Compatibility
Video
Needs Adaptation
Images
Direct Transfer
Text/Captions
Needs Adaptation
Threads vs Bluesky: Platform Specs
| Spec | Threads | Bluesky |
|---|---|---|
| Caption Limit | 500 chars | 300 chars |
| Max Video Length | 5min | 1min |
| Preferred Aspect Ratio | 9:16 | 16:9 |
| Max Video File Size | 1GB | 50MB |
| Carousel Support | Up to 20 items | Up to 4 items |
| Hashtag Strategy | Up to 1 | Unlimited |
| Link Support | Yes | Yes |
| Primary Audience | 18-34 | 20-40 |
Why Automate Threads to Bluesky?
Accompany your Threads visuals with text-driven posts on Bluesky for storytelling
Build a consistent brand presence across Threads and Bluesky with automated distribution
Grow your Bluesky following by consistently sharing your best Threads content
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Bluesky after posting to Threads
- ✗Copy and reformat captions for each platform
- ✗Constantly context-switch between apps
- ✗Risk forgetting to post to Bluesky
- ✗Spend 10-15 minutes per post managing distribution
- ✗Miss peak posting times on Bluesky
PostOnce Automation
- ✓Post to Threads like normal—we handle Bluesky
- ✓Captions automatically adapted for Bluesky
- ✓Stay in your favorite platform's workflow
- ✓Every Threads post automatically appears on Bluesky
- ✓Set up once in under 60 seconds
- ✓Consistent posting schedule maintained automatically
Manual posting might work when you're just starting out, but as your content volume grows, automation becomes essential. The difference isn't just time saved—it's the ability to maintain a consistent multi-platform presence without burning out.
How to Set Up Threads to Bluesky Automation
Connect Threads and Bluesky
Link both social accounts to PostOnce using secure OAuth authorization.
Threads uses standard OAuth and Bluesky requires standard authorization. Both connect in seconds.
Configure your automation rules
Choose to crosspost everything or filter by hashtags, content type, or custom rules.
Since Threads allows longer captions (500 chars) than Bluesky (300 chars), you may want to review caption truncation settings.
Post on Threads as usual
Create content on Threads and PostOnce handles Bluesky distribution.
Your 9:16 Threads content is automatically reformatted to 16:9 for Bluesky.
Flexible Automation Options
Control exactly how your Threads content gets distributed to Bluesky with powerful automation rules.
Post Everything
Every Threads post automatically goes to Bluesky
Filter by Hashtag
Use specific hashtags to control what gets crossposted to Bluesky
Custom Rules
Set advanced filters based on your Threads to Bluesky workflow needs
Most creators use hashtag filtering to maintain control over their crossposting workflow. For instance, you might want all your Threads tutorials to go to Bluesky, but keep personal content separate. Simply add a specific hashtag like #autopost to your Threads caption, and only those posts will be distributed.
If you want to repurpose content from Threads to Bluesky, you can also customize how captions, formats, and media are adapted for each platform's unique audience and requirements.
What to Expect
Works Well
- ✓Photos and images work well on both platforms
- ✓Text-based posts work natively on both platforms
- ✓Links in posts are supported on both platforms
Needs Adaptation
- ~Video aspect ratio needs to change from 9:16 to 16:9
- ~Captions may need shortening (500 chars to 300 chars)
- ~Videos over 1 minutes need trimming for Bluesky
- ~Hashtag strategy differs between Threads and Bluesky
- ~Carousels may need to be trimmed from 20 to 4 items
Doesn't Transfer
- ✗Polls cannot be recreated on Bluesky
Known Limitations
- ⚠Threads videos longer than 1 minutes need to be trimmed for Bluesky
- ⚠Captions over 300 characters will be shortened for Bluesky
- ⚠Carousels with more than 4 items will be truncated on Bluesky
Frequently Asked Questions
Bluesky supports videos up to 1 minutes long, 50MB file size, in 16:9, 1:1 aspect ratios. Captions can be up to 300 characters. Since Threads allows up to 5 minutes, longer videos will need trimming.
Yes. PostOnce works with both personal and business accounts on both Threads and Bluesky. Connect via OAuth authorization—your credentials are never stored.
Threads's peak engagement is 7-9 AM, 12-2 PM, 6-9 PM, while Bluesky's peak is 9-11 AM, 4-7 PM. PostOnce can publish to Bluesky at optimal times regardless of when you post on Threads.
Hashtag-like topics supported; one topic tag per post. For Bluesky: Hashtags are clickable but not algorithmically weighted. PostOnce lets you customize hashtag handling—keep them, remove them, or set platform-specific hashtag strategies.
PostOnce handles unlimited crossposting within your plan's limits. Every time you post on Threads, it's automatically shared to Bluesky—no per-post limits on automation.
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