Crosspost from Reddit to TikTok Automatically
Auto post Reddit to TikTok instantly — no downloads, no re-uploads, no manual work. Just publish on Reddit and your content appears on TikTok.
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Reddit posts and TikToks are not the same kind of content
! Reddit is text-first; TikTok is video-only — fundamentally different formats
+ ! Reddit story TikToks are a massive genre, but they use Reddit content, not link sharing
+ ! Direct cross-posting from Reddit to TikTok is not a native feature on either platform
+ ! Reddit's self-promotion rules limit how aggressively you can use it to promote TikTok content
↓ There's an easier way
What You Need to Know
How creators turn Reddit posts into TikTok content
The Reddit-to-TikTok pipeline is real and huge.
The workflow: find a compelling post or comment from a subreddit, screenshot it, add an AI voice reading the text, layer it over a gameplay video like Minecraft or Subway Surfers, and publish.
If you are the original poster, you can do this with your own content.
Tools like Kapwing and Bolta.ai are built specifically for this.
For promoting your own subreddit or Reddit page on TikTok: post a TikTok describing a trending discussion in your community, then link back in the bio or caption.
Making Reddit content land on TikTok
TikTok's hook matters most — you have 1-3 seconds.
Start with the most shocking line from the Reddit post, not the setup.
Keep the voiceover fast and the text readable but not overwhelming.
The thumbnail should show the post title clearly.
Keep these videos under 60 seconds.
The best-performing Reddit story TikToks use the text as a script but deliver it at TikTok pace — snappy, cliffhanger-driven, with edits and cuts.
PostOnce automates your Reddit-to-TikTok distribution
Post on Reddit and PostOnce handles pushing your content across to TikTok.
Set up the connection once and your Reddit posts automatically reach your TikTok audience.
Stop switching between apps — let PostOnce handle the cross-platform publishing while you focus on creating.
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Features
How PostOnce Handles It
Set up Reddit to TikTok crossposting once. PostOnce automates the rest.
Easy Reddit Crossposting Setup
Connect your Reddit and TikTok accounts, choose your crosspost rules, and you're done.
Setup takes under 60 seconds. After that, everything runs automatically in the background.
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Native Video Upload to TikTok
When you crosspost Reddit to TikTok, PostOnce uploads the actual video file — not a link, not a preview.
Your Reddit content appears as a native TikTok post, indistinguishable from content uploaded directly.
Start your free trialCustom Crosspost Rules
Not every Reddit post belongs on TikTok. Set hashtag filters, content type rules, or account-level controls to choose what gets crossposted.
Only the content you want on TikTok ends up there.
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Auto Post to Multiple Platforms
Don't stop at Reddit to TikTok crossposting. Auto post your Reddit content to YouTube Shorts, Facebook, LinkedIn, Threads, and more — all at once.
One post, everywhere. Each platform gets a native upload with adapted formatting.
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Real-Time Automation
PostOnce monitors your Reddit account and automatically crossposts new content to TikTok.
No scheduling, no batching. Publish on Reddit and it appears on TikTok within minutes — fully automated Reddit to TikTok posting.
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Reddit vs TikTok at a Glance
| Spec | TikTok | |
|---|---|---|
| Caption Limit | 40,000 chars | 4,000 chars |
| Max Video Length | 15min | 10min |
| Preferred Aspect Ratio | 16:9 | 9:16 |
| Max Video File Size | 1GB | 4GB |
| Carousel Support | Up to 20 items | Up to 35 items |
| Hashtag Strategy | Not used | Unlimited |
| Link Support | Yes | No |
| Primary Audience | 18-39 | 16-34 |
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Under 60 seconds. Connect both your Reddit and TikTok accounts, choose your filter rules, and you're done. New Reddit posts will automatically appear on TikTok.
PostOnce automatically adapts your 16:9 Reddit videos to TikTok's preferred 9:16 format, ensuring they look native.
Yes. Use hashtag filters to control which posts crosspost. For example, add #crosspost to Reddit captions and only those posts will go to TikTok. Or exclude specific hashtags to skip certain content.
PostOnce intelligently adapts your captions from Reddit's 40,000 character limit to fit TikTok's 4,000 character limit, preserving your key message.
Start Crossposting Reddit to TikTok
Connect your Reddit and TikTok accounts and start crossposting in minutes. No technical setup required.
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