Automatically Post Facebook to Reddit: Complete Guide
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Facebook reaches Millennials and Gen X while Reddit connects with Young adults interested in niche communities, letting you expand to a new audience segment. Your Facebook 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 Facebook to Reddit automation. Learn how to crosspost from Facebook to Reddit or repurpose your content for maximum reach.
Facebook to Reddit Content Compatibility
Video
Needs Adaptation
Images
Direct Transfer
Text/Captions
Needs Adaptation
Facebook vs Reddit: Platform Specs
| Spec | ||
|---|---|---|
| Caption Limit | 63,206 chars | 40,000 chars |
| Max Video Length | 4h | 15min |
| Preferred Aspect Ratio | 16:9 | 16:9 |
| Max Video File Size | 10GB | 1GB |
| Carousel Support | Up to 10 items | Up to 20 items |
| Hashtag Strategy | Unlimited | Not used |
| Link Support | Yes | Yes |
| Primary Audience | 25-54 | 18-39 |
Why Automate Facebook to Reddit?
Accompany your Facebook visuals with text-driven posts on Reddit for storytelling
Build a consistent brand presence across Facebook and Reddit with automated distribution
Grow your Reddit following by consistently sharing your best Facebook content
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Reddit after posting to Facebook
- ✗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 Facebook like normal—we handle Reddit
- ✓Captions automatically adapted for Reddit
- ✓Stay in your favorite platform's workflow
- ✓Every Facebook 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 Facebook to Reddit Automation
Connect Facebook and Reddit
Link both social accounts to PostOnce using secure OAuth authorization.
Facebook 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.
Since Facebook allows longer captions (63,206 chars) than Reddit (40,000 chars), you may want to review caption truncation settings.
Post on Facebook as usual
Create content on Facebook and PostOnce handles Reddit distribution.
Both platforms use 16:9 format, so your content transfers seamlessly.
Flexible Automation Options
Control exactly how your Facebook content gets distributed to Reddit with powerful automation rules.
Post Everything
Every Facebook 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 Facebook to Reddit workflow needs
Most creators use hashtag filtering to maintain control over their crossposting workflow. For instance, you might want all your Facebook tutorials to go to Reddit, but keep personal content separate. Simply add a specific hashtag like #autopost to your Facebook caption, and only those posts will be distributed.
If you want to repurpose content from Facebook 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
- ✓Both platforms prefer 16:9 video, so no reformatting needed
- ✓Links in posts are supported on both platforms
Needs Adaptation
- ~Captions may need shortening (63,206 chars to 40,000 chars)
- ~Videos over 15 minutes need trimming for Reddit
- ~Hashtag strategy differs between Facebook and Reddit
Doesn't Transfer
- ✗Stories format doesn't exist on Reddit
Known Limitations
- ⚠Facebook videos longer than 15 minutes need to be trimmed for Reddit
- ⚠Captions over 40,000 characters will be shortened for Reddit
- ⚠Facebook Stories cannot be crossposted to Reddit
- ⚠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. Since Facebook allows up to 4 hours, longer videos will need trimming.
Yes. PostOnce works with both personal and business accounts on both Facebook and Reddit. Connect via OAuth authorization—your credentials are never stored.
Facebook's peak engagement is 1-4 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 Facebook.
Hashtags have minimal impact; 1-2 relevant hashtags max. 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 Facebook, it's automatically shared to Reddit—no per-post limits on automation.
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