TikTok and YouTube Shorts share the same 1080 × 1920 vertical canvas, so the file itself crosses over untouched — what changes is everything around it. YouTube is a search engine wearing a feed costume: instead of one caption it wants a 100-character title plus a separate 5,000-character description, it classifies anything vertical and under 3 minutes as a Short automatically, and its monetization rules — not just its feed — care whether your upload still carries the TikTok logo.
Done right, this is the highest-leverage repost in short-form video: TikToks decay in days, while Shorts keep surfacing in YouTube search for months. This guide maps the spec deltas, what breaks in transit, and the exact workflow — manual, or composed once in SocialKit.
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Everything that changes between the two composers, side by side.
| Spec | TikTok (from) | YouTube Shorts (to) |
|---|---|---|
| Primary canvas | 1080 × 1920 px · 9:16 (video) | 1080 × 1920 px · 9:16 (shorts) |
| Caption limit | 2,200 characters via the posting API used by scheduling tools (TikTok’s own app has rolled out captions up to ~4,000) | Title 100 characters · description 5,000 characters |
| Video length | Up to 10 minutes in-app; 60-minute pre-recorded uploads rolling out to many accounts | Shorts up to 3 minutes (extended from 60 seconds in late 2024) |
| Hashtags | Hashtags and @mentions count toward the caption limit; a few specific tags is the platform convention | Hashtags go in the title or description; #shorts is no longer required for classification |
| Watermark on export | Downloads are stamped with the TikTok logo and your handle | Watermarked uploads were excluded from the Shorts Fund; monetization still requires original content |
| Caption structure | One caption field — hashtags and mentions inline | Title (100 chars, ~60 visible in search) + separate description (5,000 chars) |
| Cover / thumbnail | One 9:16 cover; profile-grid tiles crop toward the center | Frame selection in the mobile app; no standard desktop thumbnail upload |
The good news
The fine print
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Tip 1
Write Shorts titles like search queries, not punchlines: “How to fix a cracked phone screen” keeps earning views from YouTube search long after the TikTok version has gone quiet.
Tip 2
Use the Shorts version as a funnel: linking is limited inside the Shorts player, so drive viewers to your long-form videos with a pinned comment and a consistent channel page.
Tip 3
Plan one deliberate “thumbnail frame” into the edit — Shorts offer frame selection in the mobile app rather than a real thumbnail upload, and that frame represents the video on your channel and in search.
FAQ
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YouTube’s stated concern is monetization rather than a published feed penalty: it announced in 2021 that videos carrying another platform’s watermark were ineligible for the Shorts Fund, and its current Shorts monetization policies still require original content. Cross-posting itself is explicitly fine — the same video uploaded clean, without the TikTok logo, is treated like any other Short.
Up to 3 minutes, after YouTube extended the cap from 60 seconds in late 2024. Anything longer is classified as a regular YouTube video rather than a Short. TikTok allows up to 10 minutes in-app, with 60-minute uploads rolling out as of June 2026 — so long TikToks need a cut-down for the Shorts feed.
It splits in two. The hook becomes the title (100-character limit, roughly 60 visible in search), and the rest goes in the 5,000-character description along with 1–3 hashtags. Pasting the whole caption into the title field is the most common — and most visible — cross-posting mistake on Shorts.
No. YouTube classifies any vertical or square video up to 3 minutes as a Short automatically — #shorts is no longer required. Hashtags still work: the first three in the description display above the title as links.
Compose once, customize the caption per network, and let SocialKit publish to TikTok, YouTube Shorts, and 9 more platforms on schedule — no re-uploading, no copy-paste.
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