Automatically Post YouTube to Reddit: Complete Guide
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YouTube reaches Broad demographic, skews male 18-34 while Reddit connects with Young adults interested in niche communities, letting you expand to a new audience segment. While the content formats differ, repurposing YouTube content for Reddit helps you reach audiences who prefer a different medium. Whether you want to auto-post everything or filter by hashtag, this guide covers everything about YouTube to Reddit automation. Learn how to crosspost from YouTube to Reddit or repurpose your content for maximum reach.
YouTube to Reddit Content Compatibility
Video
Needs Adaptation
Images
Not Supported
Text/Captions
Direct Transfer
YouTube vs Reddit: Platform Specs
| Spec | YouTube | |
|---|---|---|
| Caption Limit | 5,000 chars | 40,000 chars |
| Max Video Length | 12h | 15min |
| Preferred Aspect Ratio | 16:9 | 16:9 |
| Max Video File Size | 256GB | 1GB |
| Carousel Support | No | Up to 20 items |
| Hashtag Strategy | Up to 60 | Not used |
| Link Support | Yes | Yes |
| Primary Audience | 18-49 | 18-39 |
Why Automate YouTube to Reddit?
Share your YouTube short videos on Reddit to double your video views without extra filming
Build a consistent brand presence across YouTube and Reddit with automated distribution
Grow your Reddit following by consistently sharing your best YouTube content
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Reddit after posting to YouTube
- ✗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 YouTube like normal—we handle Reddit
- ✓Captions automatically adapted for Reddit
- ✓Stay in your favorite platform's workflow
- ✓Every YouTube 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 YouTube to Reddit Automation
Connect YouTube and Reddit
Link both social accounts to PostOnce using secure OAuth authorization.
YouTube 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 YouTube captions fit within Reddit's limits, so default settings work great.
Post on YouTube as usual
Create content on YouTube and PostOnce handles Reddit distribution.
Both platforms use 16:9 format, so your content transfers seamlessly.
Flexible Automation Options
Control exactly how your YouTube content gets distributed to Reddit with powerful automation rules.
Post Everything
Every YouTube 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 YouTube to Reddit workflow needs
Most creators use hashtag filtering to maintain control over their crossposting workflow. For instance, you might want all your YouTube tutorials to go to Reddit, but keep personal content separate. Simply add a specific hashtag like #autopost to your YouTube caption, and only those posts will be distributed.
If you want to repurpose content from YouTube 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
- ✓Both platforms prefer 16:9 video, so no reformatting needed
- ✓Captions fit within the destination's character limit without truncation
- ✓Links in posts are supported on both platforms
Needs Adaptation
- ~Videos over 15 minutes need trimming for Reddit
- ~Hashtag strategy differs between YouTube and Reddit
Doesn't Transfer
- ✗Most content elements transfer successfully
Known Limitations
- ⚠YouTube videos longer than 15 minutes need to be trimmed for 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 YouTube allows up to 12 hours, longer videos will need trimming.
Yes. PostOnce works with both personal and business accounts on both YouTube and Reddit. Connect via OAuth authorization—your credentials are never stored.
YouTube's peak engagement is 12-4 PM, 8-11 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 YouTube.
Up to 60 hashtags allowed; 3-5 relevant hashtags recommended in description. 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 YouTube, it's automatically shared to Reddit—no per-post limits on automation.
Ready to Automate Your YouTube to Reddit?
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