AI Face Swap Video: Swap a Face Into Your Own Clip

What Is AI Face Swap Video?

An AI face swap video takes a clip you already have and replaces one person's face with a face from a still photo — keeping the original motion, camera movement, lighting, background and clothing exactly as filmed. You are not generating a video from scratch. You are re-facing footage that already exists.

That distinction matters, because it is where most tools fall apart. The hard part of any AI face swap video is not swapping one face well. It is swapping the same face 300 times in a row without the result drifting.

This guide covers how the reference-video approach avoids that drift, the exact per-second cost, the 15-second limit and why it exists, and an honest look at what the “free unlimited” tools actually give you. Everything runs in the browser at Bananaify's face swap tool — no install, no desktop software.

Why Most Face Swap Video Tools Flicker

Most free tools process footage frame by frame. Each frame is treated as an independent photo swap, so the model re-decides what the face looks like 24 or 30 times per second. Individually each frame is fine. Played back, the jaw shifts, the eye spacing breathes, and the identity visibly crawls. This is the single most common complaint about AI face swap video output, and no amount of post-sharpening fixes it.

Bananaify runs a different path. Seedance 2 accepts your clip as a reference video alongside the face photo, and solves the whole sequence as one job. The instruction it receives is explicit: keep the reference video's motion, camera work, timing, framing, background, clothing and everyone else exactly as they are, and hold the swapped identity consistent in every frame.

The practical difference is that you get a clip that looks shot, not stitched. Hair, glasses and jewellery from the original footage survive. Other people in the shot are left alone.

How to Make an AI Face Swap Video

Open the AI face swap tool and switch to the Video Face Swap tab. You need two things: the clip, and one clear photo of the face going in.

• The clip — your own footage, up to 15 seconds. The browser checks duration before upload, so you find out about a too-long clip immediately rather than after paying.
• The face photo — front-facing, evenly lit, eyes open, no heavy shadow across one cheek. A passport-style crop outperforms a group photo every time.
• Keep original hairstyle — on by default. Turn it off if you want the hair from the source photo carried over too.
• Match skin tone and lighting — tells the model to grade the incoming face to the footage instead of pasting a flat cutout. Leave this on unless the two shots were lit identically.
• Multiple faces — if the clip has several people, name the one you mean: “the man on the left,” “the woman in the red jacket.” Without it the model picks the most prominent face.

The exact credit cost appears on the generate button before you commit. A still swap lands in seconds; a full AI face swap video render takes a few minutes.

The prompt it builds for you

You do not write the prompt — the toggles compose it. If you want to see what is actually being sent, expand the prompt preview in the panel. It reads roughly like this:

What AI Face Swap Video Actually Costs

Video is billed per second, because that is how the underlying models charge. A 15-second clip genuinely costs three times a 5-second one, and a flat per-clip price would just mean short renders subsidise long ones.

One thing worth understanding up front: when a reference clip is involved, billing counts input seconds plus output seconds. A 5-second source rendered to a 5-second result bills 10 seconds. The provider charges a lower per-second rate in this mode precisely because it counts both, so quoting only the output would undercharge by roughly half. Every job has a 4-credit floor.

Which model to pick

Seedance 2.0 Mini is the sensible default. At 720p it runs 1 credit per second, so a 5-second swap costs 10 credits — a couple of dollars at the entry pack. Quality is more than enough for social media.

Seedance 2.0 is the quality tier at 5 credits per second at 720p and 12 at 1080p. Worth it when the clip is going somewhere that will be watched full-screen. For an ordinary AI face swap video destined for a phone screen, Mini is the better trade.

Credit packs start at $19 for 100 credits and get cheaper in volume. Credits never expire, and they are refundable for 7 days — full refund if you have used 5% or less, pro-rated after that. See the full pricing breakdown if you want the arithmetic on larger packs.

The 15-Second Limit, and the “Free Unlimited” Question

Clips are capped at 15 seconds. That is a real constraint and worth being straight about: if you came here to re-face a three-minute video in one pass, this will not do it. The cap exists because identity consistency degrades over longer sequences, and a clip that drifts at second 40 is not worth what it cost to render.

Search results are full of tools promising a AI face swap video that is free, unlimited, and 60 seconds long. It is worth knowing what that usually means in practice:

• A watermark across the result — removable only by upgrading, which was the point.
• 480p output regardless of what you uploaded, so the longer clip is also the softer one.
• Frame-by-frame processing — the flicker described above, which is why the free tier can afford to be generous with duration.
• Your footage as training data — check the terms. Free processing is rarely free of consideration.
• Queue times measured in hours at peak, with no priority path.

Bananaify charges for the render and puts no watermark on any output at any tier, up to 2K depending on model. Whether that is the better deal depends entirely on what you are making. For one throwaway gag clip, a free tool is genuinely the right call. For anything you intend to publish, the arithmetic changes.

Getting a Better Result

Match the head angle

The single biggest quality lever. If the clip shows a three-quarter profile, a face photo shot straight-on gives the model more work to do and more chances to drift. Roughly matching the angle between photo and footage produces a noticeably cleaner AI face swap video.

Avoid clips where the face leaves frame

Fast whip pans, a hand crossing the face, or the subject turning fully away all give the model a gap to re-solve across. Pick a clip where the face stays visible throughout.

Set the aspect ratio before generating

16:9, 9:16, 1:1, 4:3, 3:4 and 21:9 are all available. Choosing 9:16 up front means a story-format result does not need cropping afterwards, which would otherwise cost you resolution.

Test at Mini before committing at 1080p

Run the clip through Seedance 2.0 Mini at 480p first for a few credits. If the composition works, re-run at higher quality. This is much cheaper than discovering a framing problem at 12 credits per second.

Using AI Face Swap Video Responsibly

Swapping your own face, a friend who agreed, or public-domain footage is fine. Using any face swap tool to impersonate a real person, create misleading content, or produce sexual imagery of someone violates Bananaify's terms and, in a growing number of jurisdictions, the law. Explicit and non-consensual requests are blocked.

The practical rule: if you would not be comfortable telling the person whose face it is what you made, do not make it. Uploads are used only to produce your result — not sold, not used to train models, not published to any gallery — and you can delete generated files from the dashboard at any time.

AI Face Swap Video FAQ

How long can the clip be?

Up to 15 seconds. Output durations of 4, 5, 8, 10 and 15 seconds are available. Longer footage needs trimming before upload — the browser checks duration first so you are not charged for a clip that would fail.

Which model does the video swap?

Seedance 2.0 or Seedance 2.0 Mini. They are the two models that accept a reference clip, which is what makes a single-job AI face swap video possible. For still photo swaps, GPT Image 2 ranks best, with Nano Banana 2 second.

Why does it charge for the input clip as well as the output?

Because the provider bills both when a reference video is involved, at a lower per-second rate than plain generation. A 5-second source rendered to 5 seconds bills 10 seconds. The button shows the real total before you generate.

Can it swap one face when several people are on screen?

Yes. Name the person — “the man on the left” — in the multiple-face field and everyone else is left untouched.

Is there a watermark?

No, on any plan. Output comes back at up to 2K depending on model and the resolution you picked.

Do I need to install anything?

No. It runs in the browser on Windows, macOS, iPhone, iPad and Android. Processing happens server-side, so an old laptop produces the same quality as a new workstation.

Start Your First Face Swap Video

The reference-video approach is what separates a clip that looks shot from one that looks stitched. Upload your footage, add one clear face photo, set two toggles, and read the price before you spend anything.

For still images, start with the photo face swap tool. For related video work, see Photo to Video AI, Seedance Prompts and the AI UGC Video Generator guide.