The number of photos you have does not, by itself, tell you whether to choose Live3D’s Multiple Face Swap or Batch Face Swap. A group photo with three people and three separate photos with one person each both involve three faces, but they call for entirely different approaches. Count the source images first, then decide whose face should replace each one. The right tool will become clear.
Live3D Face Swap works with photos and videos that have already been captured. You upload the source image and a reference portrait, wait for the result, then review and download it. If you want the camera feed to keep swapping faces while you speak, that is a separate real-time workflow.
Start with Your Media: What the Four Tools Do
- One ordinary photo: Use Photo Face Swap. The source image is the scene you want to change, and the reference image supplies the face you want to put in it.
- One group photo: Use Multiple Face Swap. Select the faces to replace in the group photo and assign a reference portrait to each selected position.
- Several source images sharing one reference face: Use Batch Original Faces under Batch Face Swap. The same reference portrait is applied to every source image.
- One prerecorded video: Use Video Face Swap. It accepts a video file and generates a processed video.
The middle two are the easiest to confuse. Multiple Face Swap counts faces in one image; Batch Face Swap counts source images to process. Just because both involve “multiple” items does not mean you should upload several photos to Multiple Face Swap or expect Batch Face Swap to assign a different face to each person in a single group photo.
Image: Choose the task on the left first, then prepare the source image and reference face for that mode.
Different Faces in One Group Photo: Match Positions Before Generating
Suppose a group photo has three people, but you only want to replace the faces of the people on the left and in the middle. Open Multiple Face Swap, upload the group photo, and select those two positions. Then provide a separate reference portrait for each one. Leave the person on the right unselected if they do not need to change.
The key here is not to prepare three source images. It is to check who should become whom: for example, reference image A for the person on the left and reference image B for the person in the middle. Before generating, review each position and its assigned portrait. Before downloading, check whether the faces went to the right people, whether the edges look natural, and whether the eyes or mouth have obvious problems. The more people you process at once, the more important it is to verify the positions.
Live3D recommends no more than five faces in a group photo for better results. This is a quality recommendation, not a hard limit on the number of people. If the faces in the photo are very small or obscure one another, it is worth trying a photo with clearer faces first, even when there are fewer people.
The Same Face in Multiple Photos: Prepare Source and Reference Images Separately
Now consider a different case: you have three separate portraits and want to replace the person in each with the same person. Choose Batch Original Faces, upload the three source images, and then upload one shared reference face. This is for reusing one face across several photos, not for assigning different faces to people in one group photo.
The batch tool’s current upload interface supports up to ten source images per batch, with a 20MB limit for each source image; the shared reference face has a 2MB limit. That 2MB limit is particularly easy to miss. A reference image that uploads in the single-photo mode may still be too large for batch mode. Check file sizes before processing so you do not prepare a whole batch only to discover that the reference image is oversized.
For a trial run, start with two or three noticeably different source images. See whether the same reference face gives the results you expect with front-facing views, turned faces, or different lighting, then decide whether to process the full batch. This is a suggestion for reviewing the output; it does not mean the tool automatically picks the best result for you.
Just One Photo or One Video? Use the Corresponding Tool
For a single photo, go straight to Photo Face Swap. Put the photo you want to change in the source image area and the portrait you want to use in the reference face area, then generate, inspect, and download the result. For example, if you want to put yourself into a movie still, the still is the source image and a clear, front-facing photo of you is the reference. Reverse them, and the result will go in the wrong direction.
Single-photo mode currently accepts PNG, JPG, JPEG, and WEBP, with a 20MB limit for each of the two input images. Choose a reference face that is as front-facing, clear, and unobstructed as possible. When the result is ready, inspect the facial features and edges rather than judging only whether the whole image looks convincing from a distance.
If your source is a prerecorded clip, use Video Face Swap. The video tool accepts MP4, MOV, M4V, and GIF files, with a 100MB maximum for the video; reference faces can be JPG, PNG, or WEBP, up to 20MB. Clips processed for free are currently limited to 10 seconds. Make sure the action and face you want to show fall within that time, then generate and review the result. A video file may move when played, but it is still processed after upload; it cannot follow a new camera feed during a call.
Free Use and Real-Time Use Are Separate Considerations
Live3D labels its Photo Face Swap single-photo tool as free, unlimited, and available without registration. Video has its own conditions for free uses and clip length, so the photo rules do not carry over. Check the relevant pages for the conditions of the multiple-face and batch tools as well; do not assume they match the single-photo tool. Before preparing a short clip, check the free allowance shown by the video tool at that time, then decide which segment to try.
If you want a finished image or a downloadable short video, choose a Live3D tool based on the type of media above. If you want faces to keep changing during a livestream or call, you can use LiveFaceSwap AI to view the camera feed. When you need to send that feed to OBS or video-calling software, use its desktop virtual camera. For the upload steps and current limits of each Live3D tool, see the original Live3D photo and video face swap guide.
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