TikTok Video Size: The Length Limit Is Not Fixed

The shape is the easy part: 1080 × 1920, 9:16. Every guide agrees and they are right.

The length is where it falls apart, because there is no single answer — and TikTok says so in its own developer documentation, in a sentence no page ranking for this question quotes.

The short answer#

• 1080 × 1920, 9:16. This is the full-screen vertical frame and the shape you should default to.
• Square and landscape upload fine — they are simply shown letterboxed inside a vertical frame.
• Maximum length depends on your account. Not on TikTok as a platform.

Key facts, read from developers.tiktok.com on 21 August 2026 (pages marked last updated 4 August 2026): TikTok’s Query Creator Info endpoint returns max_video_post_duration_sec, the longest video duration in seconds that the creator can post, and notes that different users have different maximum video-duration privileges, so there is no single platform-wide length limit. The Direct Post reference caps captions at 2,200 UTF-16 characters, limits each user access token to 6 requests per minute and restricts unaudited apps to private viewing; the media transfer guide chunks uploads over 64 MB into 5 to 64 MB pieces, up to 1,000 of them. 1080 × 1920 at a 9:16 aspect ratio is the native frame and the TikTok video dimensions every guide gives, by convention.

The maximum length is per-account#

TikTok’s Content Posting API includes an endpoint that any integration must call before it uploads anything (page marked last updated 4 August 2026, read 21 August 2026). Among the fields it returns is one called max_video_post_duration_sec.

TikTok describes it as the longest video duration in seconds that the creator can post, and adds a sentence that settles the whole question: different users have different maximum video-duration privileges.

We can say this with some confidence because our own TikTok integration calls that endpoint before every post. It is not a documentation curiosity; it is a value that comes back different for different accounts.

Which means the honest answer to “how long can a TikTok be?” is that you have to look, and the place to look is your own upload screen rather than an article.

Page one cannot agree either#

The disagreement is not subtle once you line the results up.

Adobe and ManyChat differ by a factor of thirty on file size. On length, Adobe’s three minutes has been out of date for a long while, and no fixed figure could be right anyway given what TikTok tells its own developers.

We are not going to adjudicate the file-size question, because we could not verify a consumer figure at the source. What the API documentation does describe is an upload mechanism that chunks files — pieces of between 5 MB and 64 MB, up to a thousand of them — which implies a ceiling far above anything most people will produce.

What TikTok does with other shapes#

9:16 is described as the native frame, and the reason is simply that it fills a phone screen exactly. Anything else has to be fitted into that space.

Square and landscape videos upload without complaint. They are displayed inside the vertical frame with empty space above and below, which is not a failure so much as a decision about how much of the screen you want your video to occupy.

The practical consequence is about attention rather than compliance. A 16:9 video on TikTok occupies roughly a third of the height that a 9:16 video does, in a feed where the next video is one swipe away. It will work; it starts from further behind.

TikTok is not video-only#

Worth stating because the assumption is so widespread, and because it changes what “TikTok size” means for a lot of people.

TikTok supports photo posts, and its Content Posting API added support for them explicitly. A photo post is a sequence of stills rather than a video, and it behaves differently in the feed — people move through it at their own pace instead of yours.

For a format where you want someone to read something, that is often the better container, and it is invisible to anyone who has concluded from a size guide that TikTok takes video and nothing else.

A photo post takes up to 35 images, which is a great deal more than the format is usually used for. The same 9:16 shape applies, for the same reason — it is what fills the screen.

The caption limit is larger than you think#

TikTok’s API gives the caption limit as 2,200 characters, measured in UTF-16 runes, with hashtags and mentions matched inside that text.

That is a great deal more room than the format’s reputation suggests — it is the same ceiling Instagram allows — and almost nobody uses it. The unit matters slightly too: counting in UTF-16 means emoji and non-Latin scripts consume more of the budget than their visible length implies.

Hashtags live inside that same budget rather than beside it. TikTok matches them within the caption text, so a long tail of tags is competing for space with whatever you actually wanted to say — which is an argument for fewer and more specific tags rather than a wall of them.

What the API says about scheduling tools#

If you post to TikTok through anything other than the app, three details in TikTok’s developer documentation explain behaviour you may have noticed and not been able to account for.

• Six requests per minute, per account. Each user access token is limited to six calls a minute on the posting endpoint, which is why a tool publishing to several accounts at once paces itself rather than firing everything simultaneously.
• Large files upload in pieces. Anything over 64 MB must be sent in chunksof between 5 MB and 64 MB, up to a thousand of them, uploaded in order. A long upload that appears to stall is often simply partway through that sequence.
• Unaudited apps post privately. TikTok restricts all content from an unaudited API client to private viewing. If a tool has not passed TikTok’s audit, everything it publishes is invisible to everyone but you — and nothing about that failure looks like a failure.

That last one is worth checking before you trust any TikTok integration with a real campaign, because a private post and a successful post look identical from inside the tool.

Worth adding that the rate limit is per access token rather than per app, so it constrains how quickly one account can be posted to and not how many accounts a tool can serve. A queue that appears to be pacing itself for no reason is usually respecting exactly this.

What sits on top of the frame#

Like every vertical format, the video is played underneath an interface: a caption and account name along the bottom, a column of buttons down the right, and the sound attribution beneath that.

TikTok does not publish safe-area figures, so anyone giving you exact pixels has measured them rather than quoted them. The rule that survives interface changes is the same one that applies to Stories, to YouTube Shorts, where YouTube publishes a shape rule instead of a resolution, and to Instagram Reels — keep whatever must be read within the middle portion of the frame and treat the bottom strip and the right edge as spoken for.

We made the same point about Instagram Story sizes, where the widely quoted safe area is also community measurement rather than documentation.

One TikTok constraint worth knowing separately#

If you are planning posts rather than uploading one now, TikTok has a limitation that has nothing to do with dimensions and catches people much harder.

A published TikTok cannot be edited. Not the caption, not the cover, not the sound. On most platforms a typo in a caption is a ten-second fix; here the only remedy is deleting the post and losing whatever engagement it had gathered.

We covered the scheduling windows and that constraint in our guide to scheduling TikTok posts. It is the strongest argument for checking a caption twice on this platform specifically.

Getting existing footage to 9:16#

Most TikToks that started life somewhere else began as 16:9, and converting between them throws away the majority of the width.

The decision that matters is which part of the frame survives, and a default centre crop is right only when your subject happens to be centred. Two people in conversation, a subject at the edge of the frame, or on-screen text near a corner all break under it.

Our free video editor runs in the browser with no upload and no account, and our guide to social media image sizes marks which figures across every platform are documented and which are only widely agreed.