Multiposter
Multiposter posts your YouTube Shorts to TikTok automatically: connect your Google account through the official OAuth screen, connect TikTok the same way, and from then on one upload publishes to both platforms at once. Your original file goes to TikTok through its official Content Posting API — full quality, no watermark, no re-uploading in the app.
Skip the download-and-re-upload routine. Re-downloaded copies are re-compressed, and videos carrying another platform’s watermark get demoted by TikTok’s and Instagram’s recommendation systems. Multiposter works from your clean original export, so every platform receives the exact file you rendered.
The format already matches — a 9:16 Short fits TikTok as-is, and Multiposter validates each platform’s length and size limits before publishing. Start free: 8 uploads a month, no credit card.
| Feature | YouTube Shorts | TikTok |
|---|---|---|
| Ideal length | 15–60 seconds | 15–34 seconds |
| Maximum length | 3 minutes | 10 minutes from the app (longer for some accounts) |
| Caption style | Search-led: a keyworded title (≤100 characters) plus description does the ranking work | Hashtag-led: a long caption field where 3–5 relevant hashtags drive discovery |
Connect your Google and TikTok accounts to Multiposter through each platform’s official OAuth screen, then upload your Short once. Select TikTok (and any other platforms), add your caption, and publish or schedule. Multiposter delivers the same file to TikTok through its official Content Posting API — no re-uploading in the TikTok app.
No. Downloaded copies are re-compressed, and recycled videos that carry another platform’s watermark get demoted by TikTok and Instagram. Upload your original clean export to Multiposter once, and every platform receives the full-quality, watermark-free file.
Yes. Both are vertical 9:16 video. A standard Short (up to 3 minutes) is well within TikTok’s upload limit, and Multiposter validates each platform’s length and size limits before publishing, so nothing fails silently.
You write the caption once in Multiposter and can override it per platform — useful because Shorts leans on searchable titles while TikTok leans on hashtags. One caption works fine to start; per-platform overrides are there when you want them.
Yes. Multiposter publishes through each platform’s official API — the YouTube Data API and TikTok’s Content Posting API — using OAuth connections you authorize and can revoke at any time. There is no scraping, browser automation, or password sharing.
Yes. The Launch plan is free forever — 8 uploads a month, no credit card. Connect Google and TikTok, upload one Short, and watch it go live on both platforms.