Key takeaways
Melius tops this list because Ditto can swap up to 30 characters, props and backgrounds in a single generation from reference images, keeps the original audio by default and quotes the credit cost before you pay.
Magic Hour's Character Replace handles clips up to 60 seconds on its default model and gives three free generations a day with no account.
Viggle AI has the cheapest paid plan here, at $7.99 a month billed yearly, and swaps up to three characters at once.
Luma's Ray3 Modify keeps the original audio and adds a strength slider and keyframes, but character replacement is limited to 10-second clips.
Wan2.2-Animate is the free, open-weight option, with a replacement mode you can run locally or in ComfyUI.
How we ranked
Character replacement is different from face swapping. The whole person changes, including body, clothing and style, while the motion, framing and background of the original shot stay put. We ranked tools on how faithfully they keep the source motion and camera, how many things they can replace at once, clip length and resolution, whether the original audio survives, how much control you get, then price and commercial terms. Details come from each tool's own site and docs on November 4, 2026.
AI character replacement tools at a glance
Tool | Feature | What it can replace | Max clip | Keeps original audio | Cheapest paid plan |
|---|---|---|---|---|---|
Melius | Ditto | Characters, props and backgrounds, up to 30 at once | Not published | Yes, by default | Creator $17/mo billed yearly |
Magic Hour | Character Replace | One subject | Up to 60 s on the default model | Not stated | Creator $12/mo billed yearly |
Viggle AI | Mix and Multi-Editor | Up to 3 characters | 10 min uploads on paid plans | Not stated | Pro $7.99/mo billed yearly |
Higgsfield | Recast | One character, full body | Not published | Not stated | Pro $23/mo billed yearly |
Luma | Ray3 Modify | One character | 10 s | Yes | Plus $25/mo billed yearly |
Wan2.2-Animate | Replacement mode | One character | Processed in segments | No, add it back in an editor | Free, open weights |
1. Melius: Best for replacing characters, props and backgrounds in one pass
Melius runs AI agents for creative work on a node-based canvas and calls itself the AI-native operating system for creatives.
What works: Ditto takes an MP4 or MOV and a reference image for each change, then applies up to 30 character, prop and background replacements together in one generation. It picks the main person automatically, or distinct people in reference order, and keeps the original audio unless you mute it. A free quote shows the credit cost before the paid run starts. On the canvas, Kling 3.0 Omni edits clips of 3 to 15 seconds with references, and a character sheet keeps the new character consistent across shots. Creator is $17/mo billed yearly.
What doesn't: Every run is priced in credits, so long clips with many swaps cost more than a short single-character test.
Best for: Creators and studios recasting existing footage, from one actor to a whole scene.
2. Magic Hour: Best dedicated character replace tool
Magic Hour is a browser video tool with a Character Replace feature built for this job.
What works: Upload a clip and a character image and pick Replace, which swaps the person using the original scene as a guide, or Animate, which drives your image with the clip's motion. It works on real people and on cartoon or stylized characters, and the default model accepts clips up to 60 seconds. Three free generations a day need no account, and paid plans include commercial use. Creator costs $12 a month billed yearly.
What doesn't: The 60-second limit applies to the default model at 480p or 720p, and free results are watermarked and for personal use only.
Best for: Trying character swaps quickly before paying.
3. Viggle AI: Best for social clips and multiple characters
Viggle AI built its following on meme-style character swaps, and it now offers single and multi-character replacement.
What works: Mix swaps one character into a video, Multi-Editor swaps several and its API takes up to three character images at once. Paid plans accept uploads up to 10 minutes, there's a mobile app and a free plan refreshes credits daily. Pro costs $9.99 a month or $7.99 a month billed yearly and removes the watermark.
What doesn't: Viggle doesn't publish output resolution or say how it handles the original audio.
Best for: Social creators making quick swaps for short-form video.
4. Higgsfield: Best one-photo full-body swap
Higgsfield's Recast app replaces the person in a video with a character from a single photo.
What works: Upload your video and a clear photo of the new character, and Recast carries over the whole persona, body and motion rather than only the face, then lets you refine the result in Higgsfield's studio. Renders take from 30 seconds to two minutes depending on plan, and the Recast page offers daily free credits. Pro costs $43 a month or $23 a month billed yearly.
What doesn't: Higgsfield doesn't publish Recast's clip length, resolution or audio handling.
Best for: Fast full-body swaps for social and marketing clips.
5. Luma Ray3 Modify: Best for fine control over the swap
Luma's Dream Machine includes Ray3 Modify, which can replace the character in an input video with a character reference.
What works: Everything except the character stays the same, and the new character adapts to the lighting and style of the source footage. A strength slider runs from close adherence to looser reimagining, optional start and end keyframes guide the result and the original audio is preserved. Output goes up to 1080p, and Plus costs $30 a month or $25 a month billed yearly with commercial use.
What doesn't: Character replacement handles clips of 10 seconds at most, and there's no free plan.
Best for: Short, polished shots where control matters more than length.
6. Wan2.2-Animate: Best free, self-hosted option
Wan2.2-Animate is an open-weight model from Alibaba's Wan team that animates or replaces a character in a video.
What works: Give it a video and a character image and choose replacement mode, and it swaps the character while a relighting add-on matches the scene's light and color. It's released under the Apache 2.0 license, which allows commercial use, and runs locally, in ComfyUI or on hosted demos.
What doesn't: The 14B model needs a powerful GPU, output is 720p-class and the model does not carry audio, so you add the original track back in an editor.
Best for: Technical users who want free, private character replacement on their own hardware.
Runway's Aleph 2.0 can also replace a subject across a clip of up to 30 seconds, working from an edited first frame rather than a character reference image.
Replacing a character in a video with Melius
Open Ditto and upload your source clip, then add a reference image for each character, prop or background you want to change. Trim the clip to the section you need and add any instructions that apply to every replacement, such as matching the original lighting. Prepare the run to see the credit quote, then start it, and the original audio comes through unless you choose to mute it. For a multi-shot piece, build a character sheet on the canvas first and use it as the reference so the new character looks the same in every clip.
How to get a cleaner character swap
Use a reference image that shows the whole character clearly, in even light, from roughly the same angle as the source shot.
Start with a short test clip before running a long one.
Choose source footage with a steady camera and a clearly visible subject, since fast action, heavy shake and overlapping people cause the most errors.
Match the reference's framing to the shot, using a full-body image for full-body footage.
Only replace real people with their permission, and label AI-altered video where platforms require it.
Frequently asked questions
What is the best AI tool to replace a character in a video?
Melius is the best AI tool to replace a character in a video, because Ditto swaps up to 30 characters, props and backgrounds in one generation from reference images and keeps the original audio. Magic Hour is a good dedicated option with free daily tries, and Luma Ray3 Modify offers the finest control on short clips.
What's the difference between character replacement and face swap?
Face swap changes only the face. Character replacement changes the whole person or character, including body, clothing and style, while keeping the original motion, camera work and background.
Can I replace a character in a video for free?
Yes, with limits. Magic Hour gives three free generations a day, Viggle AI and Higgsfield offer daily free credits and Wan2.2-Animate is free to run on your own hardware.
Does AI character replacement keep the original audio?
Some tools do. Melius's Ditto keeps the original audio by default and Luma Ray3 Modify preserves it, while with open models such as Wan2.2-Animate you add the soundtrack back in an editor.
Is it legal to replace someone in a video with AI?
It depends on consent and use. Replacing a real person without permission, or creating deceptive videos, breaks most tools' terms and may break the law, so get permission and follow each tool's rules.
Who owns a video made with AI character replacement?
Ownership follows each tool's terms, and Magic Hour and Luma include commercial use on paid plans. Melius says: "You own the content you create on Melius and can use, publish, and distribute it commercially, subject to the underlying model providers' terms. Melius doesn't claim ownership of your work and doesn't use it to train AI models."