Automatically Post Facebook Reels To TikTok
PostOnce automatically converts and posts eligible Facebook Reels to TikTok—no downloading, re-uploading, or rebuilding required.
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Video Tutorial
Watch: How to Auto Post Facebook to TikTok
See how to connect Facebook as the source and TikTok as the destination, then create a PostOnce workflow that publishes compatible new and existing Facebook videos or Reels as native TikTok uploads automatically.
Setup at a glance
Your automated workflow in three steps
- 1Connect Facebook
- 2Connect TikTok
- 3Create the workflow
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Creator spotlight
One creator. Two audiences.
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Before you connect
The short answer
Yes, PostOnce can auto post eligible Facebook Reels to TikTok with a source-triggered workflow.
What manual work does this replace?+
- 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
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.
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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Direct answer
Can PostOnce automatically post from Facebook to TikTok?
Yes, PostOnce can auto post eligible Facebook Reels to TikTok with a source-triggered workflow. This is crossposting automation: you publish on Facebook, PostOnce watches for eligible Facebook Reels, and TikTok receives its own native post instead of a copied link preview.
Content types
Primary wording plus related formats
Facebook source formats
This workflow leads with Facebook Reels, and also covers related Facebook formats:
TikTok destination formats
The destination focus is TikTok, while also covering related TikTok surfaces:
Manual sharing
The manual route usually means sharing a link, sending to a Story, making a Feed post, or downloading the media and uploading it again.
- Link previews send traffic back to Facebook.
- Watermarks or source branding can hurt trust.
- Repeated downloads make daily posting hard to scale.
- Formats and captions often need cleanup.
Automatic workflow
PostOnce turns the same workflow into a repeatable rule: source account, destination account, filters, and automatic publishing.
- Connect Facebook as the source.
- Connect TikTok as the destination.
- Choose which posts should crosspost.
- Let PostOnce publish future matches automatically.
Alternatives and limits
IFTTT-style automations and native share buttons can be useful, but they often create status updates, links, or previews instead of native destination posts.
- Manual sharing is fine for one-off posts.
- Generic repurposing tools may require export first.
- Platform API limits still control what can publish.
- Music rights do not automatically transfer.
What gets adapted from Facebook to TikTok
Captions
Long captions may need shortening for TikTok.
Hashtags
TikTok: Hashtags boost discoverability via For You Page algorithm.
Aspect ratio
Video may need adaptation toward 9:16.
Destination format
Eligible media publishes as a native TikTok upload.
Watermark and metadata
PostOnce prepares media for the destination instead of reposting a link card.
Music and audio rights
Only reuse audio you have rights to publish on both platforms.
New posts and existing content
For new posts, PostOnce can watch your Facebook source and publish eligible Facebook Reels to TikTok after the workflow is created.
For existing or backlog content, use PostOnce to refill a workflow deliberately instead of dumping months of posts at once. Scheduled batches keep the destination account active without overwhelming followers.
If a video is longer than TikTok's destination limit, it needs trimming or review before publishing. TikTok supports videos up to 10 minutes.
Proof before you turn it on
Confirm the connected source account
Select the destination account or Page
Review filters and caption rules
Check the queue and destination post after publish
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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Yes. With PostOnce, you can connect Facebook as the source, choose TikTok as the destination, and create a workflow so new matching Facebook posts are crossposted to TikTok automatically.
Connect both accounts in PostOnce, create a Facebook to TikTok crossposting workflow, and choose your content filters. After setup, PostOnce can detect new eligible Facebook posts and publish them to TikTok without manual downloading or re-uploading.
Yes. PostOnce lets one eligible Facebook post trigger a matching TikTok post, so you can keep both platforms active without rebuilding the same content twice.
PostOnce preserves your media quality and adapts captions from Facebook's 63,206 character limit toward TikTok's 4,000 character limit. Media format, hashtags, and destination rules still depend on each platform's requirements.
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.
Related Crossposting Workflows
How to automatically post Facebook Reels to YouTube Shorts
Automatically post eligible Facebook Reels to YouTube Shorts as native short-form video uploads.
How to automatically post your Facebook Reels to Instagram Reels
Set up automatic crossposting from Facebook Reels to Instagram Reels.
How to automatically post your Facebook Reels to LinkedIn
Set up automatic crossposting from Facebook Reels to LinkedIn.
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Features
How PostOnce Handles It
Set up Facebook to TikTok crossposting once. PostOnce automates the rest, so one native Facebook post can trigger a matching TikTok upload automatically.
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.
Set Up Facebook to TikTokNative 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.
Publish Natively to TikTokCustom 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.
Choose What Reaches TikTok
Automatically Post Your Content to Multiple Platforms
Don't stop at Facebook to TikTok crossposting. Send eligible Facebook Reels to several connected destinations, including another account on the same platform where supported.
One post, everywhere. Each platform gets a native upload with adapted formatting.
Add More Destinations
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.
Automate TikTok Publishing
Start Crossposting Facebook to TikTok
Connect your Facebook and TikTok accounts and start crossposting in minutes. No technical setup required.
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