Automatically Post TikTok to Reddit: Complete Guide
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TikTok reaches Gen Z and young Millennials while Reddit connects with Young adults interested in niche communities, letting you expand to a new audience segment. Your TikTok 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 TikTok to Reddit automation. Learn how to crosspost from TikTok to Reddit or repurpose your content for maximum reach.
TikTok to Reddit Content Compatibility
Video
Needs Adaptation
Images
Direct Transfer
Text/Captions
Direct Transfer
TikTok vs Reddit: Platform Specs
| Spec | TikTok | |
|---|---|---|
| Caption Limit | 4,000 chars | 40,000 chars |
| Max Video Length | 10min | 15min |
| Preferred Aspect Ratio | 9:16 | 16:9 |
| Max Video File Size | 4GB | 1GB |
| Carousel Support | Up to 35 items | Up to 20 items |
| Hashtag Strategy | Unlimited | Not used |
| Link Support | No | Yes |
| Primary Audience | 16-34 | 18-39 |
Why Automate TikTok to Reddit?
Share your TikTok short videos on Reddit to double your video views without extra filming
Expand short TikTok clips into longer Reddit content for deeper audience engagement
Accompany your TikTok visuals with text-driven posts on Reddit for storytelling
Manual Posting vs Automated Distribution
Manual Method
- ✗Upload the same video to Reddit after posting to TikTok
- ✗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 TikTok like normal—we handle Reddit
- ✓Captions automatically adapted for Reddit
- ✓Stay in your favorite platform's workflow
- ✓Every TikTok 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 TikTok to Reddit Automation
Connect TikTok and Reddit
Link both social accounts to PostOnce using secure OAuth authorization.
TikTok uses platform-specific 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 TikTok captions fit within Reddit's limits, so default settings work great.
Post on TikTok as usual
Create content on TikTok and PostOnce handles Reddit distribution.
Your 9:16 TikTok content is automatically reformatted to 16:9 for Reddit.
Flexible Automation Options
Control exactly how your TikTok content gets distributed to Reddit with powerful automation rules.
Post Everything
Every TikTok 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 TikTok to Reddit workflow needs
Most creators use hashtag filtering to maintain control over their crossposting workflow. For instance, you might want all your TikTok tutorials to go to Reddit, but keep personal content separate. Simply add a specific hashtag like #autopost to your TikTok caption, and only those posts will be distributed.
If you want to repurpose content from TikTok 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
- ✓Captions fit within the destination's character limit without truncation
Needs Adaptation
- ~Video aspect ratio needs to change from 9:16 to 16:9
- ~Hashtag strategy differs between TikTok and Reddit
- ~Carousels may need to be trimmed from 35 to 20 items
Doesn't Transfer
- ✗Original music/audio from TikTok won't carry over
- ✗Duet/stitch features are TikTok-only
- ✗Stories format doesn't exist on Reddit
- ✗TikTok doesn't support caption links, so no links will transfer
Known Limitations
- ⚠Licensed music from TikTok cannot be transferred to Reddit
- ⚠Duet/stitch content is TikTok-specific and won't transfer
- ⚠TikTok Stories cannot be crossposted to Reddit
- ⚠Carousels with more than 20 items will be truncated on Reddit
- ⚠TikTok doesn't support caption links, so no links will be included in Reddit posts
- ⚠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 TikTok videos will fit within these limits.
Yes. PostOnce works with both personal and business accounts on both TikTok and Reddit. Connect via OAuth authorization—your credentials are never stored.
TikTok's peak engagement is 7-9 AM, 12-3 PM, 7-11 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 TikTok.
Hashtags boost discoverability via For You Page algorithm. 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 TikTok, it's automatically shared to Reddit—no per-post limits on automation.
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