How to Swap Faces in a Video with AI: Step-by-Step

Use ClapClip for Windows for a video face swap; the browser tool on this site accepts still images only. The reliable order is to inspect a difficult section, lock the source photo, export a short segment, and only then render the full clip. That order catches most problems while they are still cheap to fix.

Only edit footage and faces you have permission to use, and label edited content when you publish it.

Key takeaways

• Video runs on Windows. The desktop app handles photo and video editing locally. The online tool is photo-only.
• One source photo is enough. Matching angle, light and sharpness matter more than sending several photos.
• Test the hard section first. A profile, a fast turn, a hand across the face or a light change will expose problems that a calm frame hides.
• Export is paid. The app downloads for free, but exporting a test segment or a full clip requires an in-app purchase.

Decision rule: match the tool to the output. A still image goes to the browser; anything with motion goes to the desktop app.

Should you use the browser or the desktop app?

Your output	Tool	Why
One still image	Online photo tool	Free, no account, no daily swap count
A clip with movement and speech	ClapClip for Windows	The browser tool cannot accept a video file
Footage you will not upload	Local face swap	Processing stays on your PC
A long recording	Long video workflow	The same app, planned around disk space and settings

Uploading a video to the website does not fail quietly: the endpoint decodes each input as a single-frame PNG, JPEG or WebP image and rejects anything else. That is a format rule, not a size rule, so trimming the clip does not help.

Rule: if the file has a timeline, use the desktop app.

What do you need before you start?

• A Windows 10 or 11 PC. The site lists NVIDIA, AMD and Intel Arc graphics as supported hardware, with results depending on the graphics card and video resolution.
• ClapClip for Windows, from the download page.
• The video file, already on your PC.
• One clear photo of the replacement face.

Rule: if you cannot install software on the machine, the online photo tool is the only path on this site, and it remains photo-only.

How do you choose a clip that will swap cleanly?

Scrub the footage and note the moments that usually break a swap: side profiles, fast turns, hands crossing the face, and light changes. Those are the frames to inspect later.

If the clip is long, cut a short section that contains at least one of those moments. That section is your test case, not a summary of the whole file.

Rule: if the hard section fails in the preview, fix the source or the settings before rendering the full clip.

How do you choose the source photo?

Choose a photo where the face is front-facing or at a similar angle to most of the clip, the eyes are open, nothing covers the face, the light is soft, and the resolution keeps skin and eyes sharp.

A blurry or heavily filtered photo tends to produce a soft, plastic-looking face in the output. No model recovers detail the source does not contain.

Rule: change the photo before you change settings. A closer angle or matching light usually helps more than another slider.

How do you inspect difficult frames?

Load the video from your disk, add the source photo, and play the section you chose. Both stay on your PC for this workflow.

Check	What good looks like	If it fails
Edges	The jawline, hairline and ears show no seam	Change the source or the blend setting
Eyes and mouth	Blinks and speech stay stable without flicker	Use a sharper source photo
Skin tone	The face sits naturally against the neck and scene light	Match the source lighting more closely
Motion	The face stays attached during a turn instead of sliding	Use a source with a closer angle

Rule: inspect the paused frame and the moving frame. A still can look clean while the motion does not.

How do you export without wasting a render?

1. Open the clip and add the source face. Confirm the swap lands on the person you intended.
2. Review the difficult frames from the preview before you export anything.
3. Export a short segment. This is a paid action, so confirm the purchase and the price in the app before you start.
4. Watch the exported segment at full size. This is where flicker at the mouth, a shimmer at the hairline or a tone shift becomes visible.
5. Export the full clip with the same settings, and leave room on disk for the output.

Rule: keep the resolution and quality settings you tested. Raising them for the final render changes both the look and the workload.

What fails on the video path?

Symptom	Cause	What to do
A video uploaded to the website is rejected	The endpoint only decodes single-frame PNG, JPEG and WebP	Use the Windows app
Export is unavailable	Desktop export is a paid action	Confirm the in-app purchase before the test segment
The full render can differ from the test segment	The preview and the export are separate runs with their own settings	Keep the tested settings for the full file
A long file strains disk space	The source, cache and output all need room	Free space before the render
A photo uploaded to the browser is refused	Wrong format, empty file, or over the 20 MB picker limit (Product specification)	Convert the format or reduce the file size

Rule: classify the failure before changing anything: format, payment, settings or source. Each needs a different fix.

What do readers ask most?

Can I swap faces in a video online?

Not with this site's online tool, which is photo-only. For video, use the Windows app so the footage stays local. Other services do accept video uploads, with their own limits, and you would be uploading the file to them.

How long does a render take?

It depends on clip length, resolution, settings and graphics hardware. Exporting a short segment first gives you a real sample from your own machine instead of a generic number.

Do I need several photos of the new face?

No. This workflow uses one source photo. Pick the one with the clearest face and the closest lighting, and change it if the result disappoints before changing anything else.

Is it free?

The app downloads for free and previewing costs nothing. Exporting from the desktop app requires an in-app purchase. The separate browser tool for photos is free, with no account and no daily swap count.

Rule: if the preview and the exported file disagree, trust the exported file.

What should you read next?

Read how real-time face swap works if you want the processing stages behind the preview, or review the local workflow before you install ClapClip for Windows.

Rule: read the pipeline guide before you change settings. It explains what the preview can and cannot show.

Bottom line

Use the browser for a still photo and the Windows app for anything with motion. In the app, test the hardest section, lock the source photo, and export a short segment before the full file. The app is free to download, but budget for the in-app export purchase.