Automatically Post Reddit to Instagram: Complete Guide
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Reddit reaches Young adults interested in niche communities while Instagram connects with Millennials and Gen Z, letting you expand to a new audience segment. Your Reddit content format works on Instagram, 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 Instagram automation. Learn how to crosspost from Reddit to Instagram or repurpose your content for maximum reach.
Reddit to Instagram Content Compatibility
Video
Needs Adaptation
Images
Needs Adaptation
Text/Captions
Truncated
Reddit vs Instagram: Platform Specs
| Spec | ||
|---|---|---|
| Caption Limit | 40,000 chars | 2,200 chars |
| Max Video Length | 15min | 1h |
| Preferred Aspect Ratio | 16:9 | 9:16 |
| Max Video File Size | 1GB | 4GB |
| Carousel Support | Up to 20 items | Up to 10 items |
| Hashtag Strategy | Not used | Up to 30 |
| Link Support | Yes | No |
| Primary Audience | 18-39 | 18-34 |
Why Automate Reddit to Instagram?
Clip highlights from long-form Reddit content into short Instagram posts
Build a consistent brand presence across Reddit and Instagram with automated distribution
Grow your Instagram following by consistently sharing your best Reddit content
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Instagram after posting to Reddit
- ✗Copy and reformat captions for each platform
- ✗Constantly context-switch between apps
- ✗Risk forgetting to post to Instagram
- ✗Spend 10-15 minutes per post managing distribution
- ✗Miss peak posting times on Instagram
PostOnce Automation
- ✓Post to Reddit like normal—we handle Instagram
- ✓Captions automatically adapted for Instagram
- ✓Stay in your favorite platform's workflow
- ✓Every Reddit post automatically appears on Instagram
- ✓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 Instagram Automation
Connect Reddit and Instagram
Link both social accounts to PostOnce using secure OAuth authorization.
Reddit uses standard OAuth and Instagram requires platform-specific 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 Instagram (2,200 chars), you may want to review caption truncation settings.
Post on Reddit as usual
Create content on Reddit and PostOnce handles Instagram distribution.
Your 16:9 Reddit content is automatically reformatted to 9:16 for Instagram.
Flexible Automation Options
Control exactly how your Reddit content gets distributed to Instagram with powerful automation rules.
Post Everything
Every Reddit post automatically goes to Instagram
Filter by Hashtag
Use specific hashtags to control what gets crossposted to Instagram
Custom Rules
Set advanced filters based on your Reddit to Instagram 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 Instagram, 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 Instagram, 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
Needs Adaptation
- ~Video aspect ratio needs to change from 16:9 to 9:16
- ~Captions may need shortening (40,000 chars to 2,200 chars)
- ~Hashtag strategy differs between Reddit and Instagram
- ~Carousels may need to be trimmed from 20 to 10 items
Doesn't Transfer
- ✗Clickable links in captions are not supported on Instagram
Known Limitations
- ⚠Captions over 2,200 characters will be shortened for Instagram
- ⚠Carousels with more than 10 items will be truncated on Instagram
Frequently Asked Questions
Instagram supports videos up to 1 hours long, 4GB file size, in 9:16, 1:1, 4:5, 16:9 aspect ratios. Captions can be up to 2,200 characters. Your Reddit videos will fit within these limits.
Yes. PostOnce works with both personal and business accounts on both Reddit and Instagram. Connect via OAuth authorization—your credentials are never stored.
Reddit's peak engagement is 6-8 AM, 12-2 PM (US timezones), while Instagram's peak is 11 AM-1 PM, 7-9 PM. PostOnce can publish to Instagram at optimal times regardless of when you post on Reddit.
Hashtags are not used on Reddit. For Instagram: Up to 30 hashtags allowed; 3-5 targeted hashtags recommended. 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 Instagram—no per-post limits on automation.
Ready to Automate Your Reddit to Instagram?
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