Post the same vertical video to all three and you will get three different results. TikTok still gives an unknown creator the best chance of being discovered. Reels gives you the most reliable reach if you already have an Instagram audience. Shorts is the only one of the three where a video keeps earning views months later, because it sits inside a search engine.
Most people should post to all three. The question worth answering is which one you edit for.
How do the three compare?
| TikTok | Instagram Reels | YouTube Shorts | |
|---|---|---|---|
| Parent | ByteDance | Meta | |
| Audience | Over a billion monthly users, no current first-party global figure we could confirm | Instagram passed 3 billion monthly actives (Meta, September 2025) | Inside YouTube, which is the largest video platform in the world |
| Discovery for a new account | Strongest of the three | Moderate, favours existing followers | Moderate, but improves over time via search |
| Content shelf life | Days, occasionally a second spike | Days | Months. Shorts surface in YouTube search long after posting |
| Max length | Longer than the other two, and it has been raised repeatedly | Shorter than TikTok | Up to 3 minutes |
| Caption length | Long, thousands of characters | Long | Short title plus description |
| Monetisation | Creator programmes, TikTok Shop, brand deals | Bonuses and brand deals, no revenue share on organic Reels | Ads revenue share, the most direct of the three |
| Posting API | Content Posting API, audit required before public posts | Instagram Graph API, Meta app review, Business or Creator account | YouTube Data API, quota-limited, unverified projects upload private only |
| Suits | New creators, trend-led content, consumer brands | Brands with an existing Instagram following | Anything searchable, tutorials, evergreen |
Note: Figures here were verified against Meta’s public statements as of September 2025 and each platform’s own help centre and developer documentation as of September 2026. TikTok does not publish a current global monthly-user figure we could confirm from its own newsroom, and the widely quoted YouTube Shorts daily-view figure comes from YouTube’s annual CEO letter, which we could not load to verify directly. Platforms change these without notice.
We would rather leave two cells hedged than print a number we could not trace to the company that owns it. Every “TikTok has X billion users in 2026” figure you will find traces back to third-party panels, not to ByteDance.
Which one gets a new account the most views?
TikTok, still. Its ranking system has always been willing to show a video from an account with no followers to a large audience if early engagement is good. That is the reason it grew the way it did, and it remains the best reason to start there.
Reels is the opposite trade. Reach is more predictable and more tied to the audience you already have. If you have 50,000 Instagram followers, Reels will reliably reach a slice of them. If you have none, Reels is slow going.
Shorts sits in a different category altogether. Early views tend to be modest, but Shorts are indexed and surfaced by YouTube search and suggestions, so a video answering a real question can keep accumulating views for months. Nothing else here does that.
Where does the same video actually work?
Vertical video moves between the three more easily than any other content type, with three specific catches.
Watermarks. Exporting from one app and uploading to another with a visible logo on it is the classic mistake, and all three have at various points down-ranked reposted content that carries a competitor’s watermark. Export clean.
Safe zones. The three overlay their own interface in different places, so text placed comfortably in one gets covered by a caption bar or a progress scrubber in another. Check with the TikTok safe zone checker and its Shorts equivalent before you commit a template.
Text conventions. A caption written for TikTok reads wrong as a YouTube title, because one is conversational and the other is a search query. This is the one thing genuinely worth rewriting per platform.
The mechanics of doing all three at once are in posting to TikTok, Reels and Shorts at the same time, and the two-platform case is covered in cross-posting Instagram Reels to TikTok.
Which pays creators best?
YouTube, by a distance, if you are optimising for direct payment. Shorts participates in YouTube’s ads revenue share, which is a real per-view payment rather than a discretionary fund.
TikTok pays through creator programmes and, more meaningfully for most people, through TikTok Shop and brand deals. The platform is far better at driving product sales than it is at paying per view.
Instagram does not share ad revenue on organic Reels. Money there comes from brand deals and occasional bonus programmes, which means Reels earns indirectly by growing an audience you monetise somewhere else.
What about the APIs?
All three are gated, in different ways, and none of them is quick.
TikTok’s Content Posting API requires passing TikTok’s audit before your app can publish public posts. Until then you are limited to private posts, which is fine for testing and useless in production. The detail is in our TikTok Content Posting API guide.
Instagram’s publishing API needs a Business or Creator account linked to a Facebook Page, a Meta app, and permission review. Walk-through in the Instagram API post tutorial.
YouTube’s Data API is quota-based rather than review-based, and a video upload is expensive in quota terms. Unverified API projects can only upload private videos until they pass an audit. See the YouTube Data API upload guide.
The verdict: which should you prioritise?
Prioritise TikTok if you are unknown and want to be found. Nothing else gives a zero-follower account the same odds. Accept that the content has a shelf life of days and the pace is relentless.
Prioritise Reels if you already have an Instagram audience. You are not starting from nothing, the audience is already there, and Reels is how Instagram distributes video now. It is a retention channel more than a discovery one.
Prioritise Shorts if your content answers questions. Tutorials, explainers, how-to, product demonstrations. It is the only one of the three where a video works for you six months later, and it is the only one that pays a straightforward revenue share.
Do all three if you are already making the video. The marginal cost of a second and third upload is small compared with the cost of filming. Just rewrite the text for each and export without a watermark.
The short version
TikTok is best for discovery, Reels is best if you already have an Instagram following, and Shorts is best for anything searchable or anything you want paid for. Post to all three, export clean, check the safe zones, and rewrite only the caption or title. Prioritising means deciding which platform’s conventions you edit for, not which one you skip.
Publishing one video to all three
BulkPublish takes a single upload and publishes it to TikTok, Instagram Reels and YouTube Shorts, with a separate caption or title per platform and each network’s own constraints checked before it is sent. It supports 15 networks in total, so the same video can also go to Facebook or Pinterest without a second upload. See bulk publishing.