Automatically Post Reddit to Threads: Complete Guide
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Reddit reaches Young adults interested in niche communities while Threads connects with Instagram users looking for text-based discussion, letting you expand to a new audience segment. Your Reddit content format works on Threads, 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 Reddit to Threads automation. Learn how to crosspost from Reddit to Threads or repurpose your content for maximum reach.
Reddit to Threads Content Compatibility
Video
Needs Adaptation
Images
Needs Adaptation
Text/Captions
Truncated
Reddit vs Threads: Platform Specs
| Spec | Threads | |
|---|---|---|
| Caption Limit | 40,000 chars | 500 chars |
| Max Video Length | 15min | 5min |
| Preferred Aspect Ratio | 16:9 | 9:16 |
| Max Video File Size | 1GB | 1GB |
| Carousel Support | Up to 20 items | Up to 20 items |
| Hashtag Strategy | Not used | Up to 1 |
| Link Support | Yes | Yes |
| Primary Audience | 18-39 | 18-34 |
Why Automate Reddit to Threads?
Clip highlights from long-form Reddit content into short Threads posts
Accompany your Reddit visuals with text-driven posts on Threads for storytelling
Build a consistent brand presence across Reddit and Threads with automated distribution
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Threads after posting to Reddit
- ✗Copy and reformat captions for each platform
- ✗Constantly context-switch between apps
- ✗Risk forgetting to post to Threads
- ✗Spend 10-15 minutes per post managing distribution
- ✗Miss peak posting times on Threads
PostOnce Automation
- ✓Post to Reddit like normal—we handle Threads
- ✓Captions automatically adapted for Threads
- ✓Stay in your favorite platform's workflow
- ✓Every Reddit post automatically appears on Threads
- ✓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 Reddit to Threads Automation
Connect Reddit and Threads
Link both social accounts to PostOnce using secure OAuth authorization.
Reddit uses standard OAuth and Threads 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 Reddit allows longer captions (40,000 chars) than Threads (500 chars), you may want to review caption truncation settings.
Post on Reddit as usual
Create content on Reddit and PostOnce handles Threads distribution.
Your 16:9 Reddit content is automatically reformatted to 9:16 for Threads.
Flexible Automation Options
Control exactly how your Reddit content gets distributed to Threads with powerful automation rules.
Post Everything
Every Reddit post automatically goes to Threads
Filter by Hashtag
Use specific hashtags to control what gets crossposted to Threads
Custom Rules
Set advanced filters based on your Reddit to Threads workflow needs
Most creators use hashtag filtering to maintain control over their crossposting workflow. For instance, you might want all your Reddit tutorials to go to Threads, but keep personal content separate. Simply add a specific hashtag like #autopost to your Reddit caption, and only those posts will be distributed.
If you want to repurpose content from Reddit to Threads, 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 16:9 to 9:16
- ~Captions may need shortening (40,000 chars to 500 chars)
- ~Videos over 5 minutes need trimming for Threads
- ~Hashtag strategy differs between Reddit and Threads
Doesn't Transfer
- ✗Most content elements transfer successfully
Known Limitations
- ⚠Reddit videos longer than 5 minutes need to be trimmed for Threads
- ⚠Captions over 500 characters will be shortened for Threads
Frequently Asked Questions
Threads supports videos up to 5 minutes long, 1GB file size, in 9:16, 1:1, 16:9 aspect ratios. Captions can be up to 500 characters. Since Reddit allows up to 15 minutes, longer videos will need trimming.
Yes. PostOnce works with both personal and business accounts on both Reddit and Threads. Connect via OAuth authorization—your credentials are never stored.
Reddit's peak engagement is 6-8 AM, 12-2 PM (US timezones), while Threads's peak is 7-9 AM, 12-2 PM, 6-9 PM. PostOnce can publish to Threads at optimal times regardless of when you post on Reddit.
Hashtags are not used on Reddit. For Threads: Hashtag-like topics supported; one topic tag per post. 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 Reddit, it's automatically shared to Threads—no per-post limits on automation.
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