How to Keep One Face Across AI Video Clips: Face Swap, Character Swap or Image-to-Video

Subscribers pay for a person they recognize. A feed where the face shifts from clip to clip reads as several different people, and the account loses the one thing that makes it worth following. With pictures the problem is mostly solved. With video it is harder, because the face has to hold through every frame while the head turns.

There are three ways to get the same face into every clip: video face swap, character swap and image-to-video. They are not interchangeable, because each one changes a different part of the video. Face swap when the body already matches, character swap when it does not, and image-to-video when you only have a picture.

The three methods at a glance

Method	What you start with	What changes	What stays
Video face swap	A finished video and a face	The face	Body, movement, scene, sound
Character swap	A finished video and a persona	The whole person	The scene
Image-to-video	A still picture	Adds motion to the picture	The face, body and scene of the picture

Method 1: video face swap

A video face swap takes a face from a picture and places it onto the person in a video. Everything else in the clip stays as it was recorded or generated.

Use it when the clip is right and only the face is wrong. That is the usual case when the body in the video already matches your persona, or when you filmed yourself and want your AI persona’s face on the result.

Where you post decides which face you can use. The OnlyFans Terms of Use only allow AI content that “clearly features the verified Creator”, so a persona’s face on your body is not allowed there. Persona content belongs on Fanvue or MYM with their AI labels. Fanvue adds that if the body is a real person’s, “even if the face is AI, this model is classed as a real model and must be verified as such”, per its article on AI-generated models.

In FansCreator, AI video face swap works within these limits:

• The video can be up to 30 seconds long, on every plan.
• It works on videos with one person in them.
• You can upload your own video or use a clip you generated in FansCreator.
• The original sound is kept.
• The free plan exports at 720p, paid plans go up to 1080p, and no plan adds a watermark.
• A swap takes a minute at most.
• GIFs are not supported.

Method 2: character swap

A character swap replaces the whole person in the video with your persona and keeps the scene. It works on video as well as on pictures.

Use it when a new face alone would not be enough. If the hair or the build of the person in the clip is clearly different from your persona, a swapped face sits on a body your subscribers do not recognize. Replacing the whole character fixes that.

The simple rule: face swap when the body already matches, character swap when it does not.

Method 3: image-to-video

Image-to-video starts from a still picture and adds motion to it. The clip keeps the face, the body and the scene of the picture you started from.

Use it when you do not have a video yet. Because the clip is built from a picture of your persona, there is nothing to swap afterwards. The NSFW AI video generator works this way, and the trade-offs between prompt-only video and picture-based video are covered in text-to-video vs image-to-video.

Which method to pick

• You have a clip and the body matches your persona: video face swap.
• You have a clip and the body does not match: character swap.
• You have a picture and no clip: image-to-video.
• You have a picture set with a drifting face: AI face swap for pictures.

The methods also combine. A common order is to generate a clip from an approved picture, then use face swap on older clips so the back catalogue matches the new material.

Getting a clean result

These points follow from how the feature works rather than from any setting:

• Keep clips short and single-subject. The limit is 30 seconds and one person per video, so cut longer footage into separate clips before swapping.
• Use the same face picture every time. One source picture for every swap keeps the persona identical across the catalogue.
• Match before you swap. If the person in the clip differs a lot from your persona, use character swap instead of forcing a face onto the wrong body.
• Plan for resolution. If the clip is going behind a paywall, export at the resolution you sell. The free plan stops at 720p.

Whose face you can use

The same rule applies to all three methods. The face or character has to be your own AI persona, your own face, or the face of a person who has given you consent that you can prove. Swapping in anyone else is prohibited by the FansCreator Terms of Use and can be a crime.

The video has to be yours as well. Putting your face onto another performer’s content breaks platform rules even when the face is your own. OnlyFans’ moderation guide bars sexually explicit content that “includes a person who is not the verified creator and has not confirmed their age, identity, or consent”.

The platform matters too:

• OnlyFans allows AI content only if it clearly features the verified creator and carries a label such as #ai or #AIGenerated, per its AI content article. The Help Centre also lists content that “features heavily altered images” among removals. Use your own face here, never a persona’s.
• Fanvue allows fully AI creators and face swaps if you verify the real model behind the AI and disclose it clearly, per its AI content policy.
• MYM allows AI content labelled “Virtual Image”, #AI or #AIgenerated, per its AI content guide.
• Fansly bans photorealistic AI content, including face-swapped content, even when labelled, per its AI content article.

The OnlyFans rules are quoted in full on the OnlyFans AI content policy page, and the wider platform comparison is in OnlyFans vs Fanvue vs Fansly.

Pick by what you start with

Face swap changes the face. Character swap changes the person. Image-to-video builds the clip from a picture that already has the right face. Pick by what you are starting with, keep one source face for everything, and only ever use a face that is yours to use.