How long can a face swap video be?

Why there is a limit at all

A video face swap is not one operation. It is one operation per frame, plus the work of keeping those frames consistent with each other. A thirty-second clip at thirty frames per second is nine hundred separate swaps that then have to agree with one another.

That cost is linear and it is paid in GPU time, which is the real constraint behind every limit you will meet. A tool that gives away unlimited video is either charging elsewhere, queueing you behind everybody else, or quietly reducing resolution until the sum works.

What the usual caps look like

Free tiers across this category cluster tightly, and it is worth knowing the shape before you upload something and find out:

• Ten to thirty seconds is the most common free ceiling. Enough for a short social post, not enough for a scene.
• Sixty seconds turns up on paid entry tiers.
• Resolution caps travel with length caps. A free tier that allows a longer clip often returns it at a lower resolution, which is the same economy applied at a different point.
• Queue position is the third lever. An unlimited free tier that takes an hour to return a clip is a length cap wearing a different hat.

Treat any "unlimited" claim as a question about which of those three is doing the work.

Where SwapX stops

Five minutes. That is the hard ceiling, and it is not a free one — a clip that length costs 310 credits, and the price rises with frame count exactly as the cost does. What it is, is possible, and that is the part most browser tools cannot say.

Credits are bought once. Nothing renews, nothing expires, and a job that fails returns its credits without you having to ask.

When your clip is longer than the limit

Three approaches, in the order most people should try them:

1. Cut first, swap second. This is nearly always the right answer. If the face is on screen for forty seconds of a four-minute video, swap the forty seconds and edit it back in. You pay for what you use and the result is no different.
2. Swap in sections. For a long continuous shot, split at a cut rather than mid-motion, swap each piece, and rejoin. Splitting at a cut matters: the small frame-to-frame differences between two separately rendered sections are invisible across an edit and obvious in the middle of a pan.
3. Reconsider the shot. A five-minute unbroken take of one face is unusual outside of an interview. If that is what you have, the honest answer is that no browser tool is built for it.

What actually takes the time

Length is the first factor and not the only one. Resolution multiplies the per-frame cost; a 4K clip is roughly four times the work of 1080p for the same duration. Frame rate does the same thing — sixty frames per second is twice the swaps of thirty for the same number of seconds.

If a clip is close to a limit, downscaling it before upload is usually a better trade than cutting it, because face swap output is rarely sharper than its source anyway.

One thing worth saying about consent

Longer video makes a swap more convincing, and that raises what is at stake rather than lowering it. Use your own face or one you have explicit permission to use. Placing a real person into sexual content without their consent is illegal in the US, UK, EU and Australia and is prohibited here regardless of jurisdiction — the Acceptable Use Policy has the full text.