Going from Instagram to TikTok is the easy direction on paper: both platforms want the same 1080 × 1920 vertical video, a 3-minute Reel fits comfortably inside TikTok’s 10-minute in-app ceiling, and a 2,200-character Instagram caption is exactly the budget TikTok’s posting API allows. Nothing gets cut in transit.
What does bite is policy and culture. TikTok’s For You feed eligibility standards exclude visibly watermarked, recycled uploads from recommendation — and the file Instagram lets you download carries an Instagram watermark. Meanwhile a caption written as an Instagram mood line wastes TikTok’s biggest free lever: captions there are search text. This guide maps the spec deltas, what genuinely breaks, and the exact steps — by hand, or composed once in SocialKit.
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Everything that changes between the two composers, side by side.
| Spec | Instagram (from) | TikTok (to) |
|---|---|---|
| Primary canvas | 1080 × 1920 px · 9:16 (reel) | 1080 × 1920 px · 9:16 (video) |
| Caption limit | 2,200 characters | 2,200 characters via the posting API used by scheduling tools (TikTok’s own app has rolled out captions up to ~4,000) |
| Video length | Reels up to 3 minutes for standard accounts (Instagram has been extending limits) | Up to 10 minutes in-app; 60-minute pre-recorded uploads rolling out to many accounts |
| Hashtags | Capped at 5 per post (rolling out since Dec 2025), counted across caption and comments; 3–5 focused tags was already Instagram’s guidance | Hashtags and @mentions count toward the caption limit; a few specific tags is the platform convention |
| Watermark on export | Downloaded Reels carry an Instagram logo and your username | TikTok’s For You eligibility standards exclude visibly watermarked, unoriginal uploads |
| Sound licensing | Music library licensed for Meta’s apps; licensed audio removed from downloads | Rebuild with TikTok’s library or your original audio |
| Cover / thumbnail | 9:16 cover cropped to 4:5 in the feed and 3:4 on the grid | One 9:16 cover; profile-grid tiles crop toward the center |
The good news
The fine print
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Tip 1
Write the TikTok caption like a search result: “3 carry-on packing mistakes” will keep finding viewers through TikTok search long after the For You push ends — Instagram captions almost never do this job.
Tip 2
Re-check your first two seconds: TikTok viewers swipe faster than Reels viewers scroll, and the For You feed shows your video to people with no idea who you are. If the hook leans on your Instagram following for context, re-cut it.
Tip 3
Keep one master archive: store every final export in a folder before it touches either app. The watermark problem — in both directions — disappears when you never re-download your own content.
FAQ
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TikTok’s For You feed Eligibility Standards list unoriginal, reproduced content — including uploads with a visible watermark or superimposed logo — as ineligible for For You recommendation. The video isn’t removed; it simply isn’t pushed, which on TikTok is most of the distribution. A clean, watermark-free upload of the same video is treated like any other post.
Use the original file you uploaded — your editing app’s export or the camera-roll copy. Instagram’s download option stamps the file with its logo and your username, and has removed licensed audio from downloads. Third-party watermark removers re-compress the video and leave artifacts that read as low quality.
Yes — Instagram caps captions at 2,200 characters, exactly what TikTok’s posting API (used by all scheduling tools) accepts, so nothing truncates. But rewrite it anyway: TikTok captions feed search, so a keyword-rich phrasing earns discovery an Instagram-style caption won’t.
Reels run up to 3 minutes for standard accounts as of June 2026; TikTok accepts up to 10 minutes recorded in-app, with 60-minute pre-recorded uploads rolling out to many accounts. Every publishable Reel fits TikTok with room to spare — this direction never needs trimming.
Compose once, customize the caption per network, and let SocialKit publish to Instagram, TikTok, and 9 more platforms on schedule — no re-uploading, no copy-paste.
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