Crosspost from Facebook to TikTok Automatically
Auto post Facebook to TikTok instantly — no downloads, no re-uploads, no manual work. Just publish on Facebook and your content appears on TikTok.
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Facebook to TikTok: no native bridge, real watermark problem
! TikTok and Facebook are owned by competing companies — no native integration exists
+ ! TikTok's API restricts most tools from directly publishing, requiring manual confirmation
+ ! Facebook Reels downloaded through the app carry a Facebook watermark that TikTok suppresses
+ ! Facebook video aspect ratios (especially horizontal) need editing for TikTok's 9:16 format
+ ! TikTok's algorithm detects and penalizes content with competitor watermarks
↓ There's an easier way
What You Need to Know
How creators move Facebook Reels to TikTok
If you have the original video file saved before uploading to Facebook, use that for TikTok.
If you only have what's on Facebook, use a third-party downloader that removes the watermark during the download process — not the in-app save function.
Once you have the clean MP4: upload to TikTok, write a new caption entirely (Facebook captions are too long and use different hashtags), and choose a starting frame that hooks immediately since TikTok is a pure scroll-feed.
Most scheduling tools for TikTok send a push notification to complete the post manually rather than publishing directly, due to TikTok's API limits.
Making Facebook content feel native on TikTok
TikTok's audience is younger and expects faster pacing, trending audio, and a hook in the first two seconds.
If your Facebook video starts with a logo intro or slow build, cut it before uploading to TikTok.
Add a trending sound even at low volume — TikTok's recommendation engine uses audio signals.
Captions should be short (one line) and provocative.
Facebook-style long captions with emoji paragraphs look out of place on TikTok.
Stick to three to five hashtags maximum, mixing trending and niche.
PostOnce moves Facebook content to TikTok without the manual steps
PostOnce grabs your original Facebook video file — pre-watermark — and publishes it to TikTok automatically when you post on Facebook.
Captions get reformatted for TikTok's style.
No downloading, no re-uploading, no watermark scrubbing needed.
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Features
How PostOnce Handles It
Set up Facebook to TikTok crossposting once. PostOnce automates the rest.
Easy Facebook Crossposting Setup
Connect your Facebook 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 Facebook to TikTok, PostOnce uploads the actual video file — not a link, not a preview.
Your Facebook content appears as a native TikTok post, indistinguishable from content uploaded directly.
Start your free trialCustom Crosspost Rules
Not every Facebook 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 Facebook to TikTok crossposting. Auto post your Facebook 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 Facebook account and automatically crossposts new content to TikTok.
No scheduling, no batching. Publish on Facebook and it appears on TikTok within minutes — fully automated Facebook to TikTok posting.
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Facebook vs TikTok at a Glance
| Spec | TikTok | |
|---|---|---|
| Caption Limit | 63,206 chars | 4,000 chars |
| Max Video Length | 4h | 10min |
| Preferred Aspect Ratio | 16:9 | 9:16 |
| Max Video File Size | 10GB | 4GB |
| Carousel Support | Up to 10 items | Up to 35 items |
| Hashtag Strategy | Unlimited | Unlimited |
| Link Support | Yes | No |
| Primary Audience | 25-54 | 16-34 |
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Under 60 seconds. Connect both your Facebook and TikTok accounts, choose your filter rules, and you're done. New Facebook posts will automatically appear on TikTok.
PostOnce automatically adapts your 16:9 Facebook 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 Facebook captions and only those posts will go to TikTok. Or exclude specific hashtags to skip certain content.
PostOnce intelligently adapts your captions from Facebook's 63,206 character limit to fit TikTok's 4,000 character limit, preserving your key message.
Start Crossposting Facebook to TikTok
Connect your Facebook and TikTok accounts and start crossposting in minutes. No technical setup required.
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