Automatically Post Threads to Reddit: Complete Guide
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Threads reaches Instagram users looking for text-based discussion while Reddit connects with Young adults interested in niche communities, letting you expand to a new audience segment. Your Threads content format works on Reddit, 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 Reddit automation. Learn how to crosspost from Threads to Reddit or repurpose your content for maximum reach.
Threads to Reddit Content Compatibility
Video
Needs Adaptation
Images
Direct Transfer
Text/Captions
Direct Transfer
Threads vs Reddit: Platform Specs
| Spec | Threads | |
|---|---|---|
| Caption Limit | 500 chars | 40,000 chars |
| Max Video Length | 5min | 15min |
| Preferred Aspect Ratio | 9:16 | 16:9 |
| Max Video File Size | 1GB | 1GB |
| Carousel Support | Up to 20 items | Up to 20 items |
| Hashtag Strategy | Up to 1 | Not used |
| Link Support | Yes | Yes |
| Primary Audience | 18-34 | 18-39 |
Why Automate Threads to Reddit?
Expand short Threads clips into longer Reddit content for deeper audience engagement
Accompany your Threads visuals with text-driven posts on Reddit for storytelling
Build a consistent brand presence across Threads and Reddit with automated distribution
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Reddit after posting to Threads
- ✗Copy and reformat captions for each platform
- ✗Constantly context-switch between apps
- ✗Risk forgetting to post to Reddit
- ✗Spend 10-15 minutes per post managing distribution
- ✗Miss peak posting times on Reddit
PostOnce Automation
- ✓Post to Threads like normal—we handle Reddit
- ✓Captions automatically adapted for Reddit
- ✓Stay in your favorite platform's workflow
- ✓Every Threads post automatically appears on Reddit
- ✓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 Reddit Automation
Connect Threads and Reddit
Link both social accounts to PostOnce using secure OAuth authorization.
Threads uses standard OAuth and Reddit requires standard authorization. Both connect in seconds.
Configure your automation rules
Choose to crosspost everything or filter by hashtags, content type, or custom rules.
Your Threads captions fit within Reddit's limits, so default settings work great.
Post on Threads as usual
Create content on Threads and PostOnce handles Reddit distribution.
Your 9:16 Threads content is automatically reformatted to 16:9 for Reddit.
Flexible Automation Options
Control exactly how your Threads content gets distributed to Reddit with powerful automation rules.
Post Everything
Every Threads post automatically goes to Reddit
Filter by Hashtag
Use specific hashtags to control what gets crossposted to Reddit
Custom Rules
Set advanced filters based on your Threads to Reddit 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 Reddit, 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 Reddit, 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
- ✓Captions fit within the destination's character limit without truncation
- ✓Links in posts are supported on both platforms
Needs Adaptation
- ~Video aspect ratio needs to change from 9:16 to 16:9
- ~Hashtag strategy differs between Threads and Reddit
Doesn't Transfer
- ✗Most content elements transfer successfully
Known Limitations
- ⚠Reddit doesn't support hashtags—they'll be removed from captions
Frequently Asked Questions
Reddit supports videos up to 15 minutes long, 1GB file size, in 16:9, 1:1, 9:16 aspect ratios. Captions can be up to 40,000 characters. Your Threads videos will fit within these limits.
Yes. PostOnce works with both personal and business accounts on both Threads and Reddit. Connect via OAuth authorization—your credentials are never stored.
Threads's peak engagement is 7-9 AM, 12-2 PM, 6-9 PM, while Reddit's peak is 6-8 AM, 12-2 PM (US timezones). PostOnce can publish to Reddit at optimal times regardless of when you post on Threads.
Hashtag-like topics supported; one topic tag per post. For Reddit: Hashtags are not used on Reddit. 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 Reddit—no per-post limits on automation.
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