WaveSpeedAI Face Swapper

Swap faces in images and videos using WaveSpeed AI. Supports image face swap and video face swap with multi-face targeting. Produces watermark-free results with automatic lighting and skin tone adaptation. Use when the user wants to replace a face in an image or video with another face.

Swap faces in images and videos using WaveSpeed AI. Produces watermark-free results with automatic lighting and skin tone adaptation. Supports targeting specific faces when multiple people are present.

Authentication

bash

export WAVESPEED_API_KEY="your-api-key"

Get your API key at wavespeed.ai/accesskey.

Quick Start

Image Face Swap

javascript

import wavespeed from 'wavespeed';

// Upload local images to get URLs
const imageUrl = await wavespeed.upload("/path/to/target-photo.png");
const faceUrl = await wavespeed.upload("/path/to/reference-face.png");

const output_url = (await wavespeed.run(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl
  }
))["outputs"][0];

Video Face Swap

javascript

import wavespeed from 'wavespeed';

// Upload local files to get URLs
const videoUrl = await wavespeed.upload("/path/to/video.mp4");
const faceUrl = await wavespeed.upload("/path/to/reference-face.png");

const output_url = (await wavespeed.run(
  "wavespeed-ai/video-face-swap",
  {
    video: videoUrl,
    face_image: faceUrl
  }
))["outputs"][0];

You can also pass existing URLs directly:

javascript

const output_url = (await wavespeed.run(
  "wavespeed-ai/image-face-swap",
  {
    image: "https://example.com/target-photo.jpg",
    face_image: "https://example.com/reference-face.jpg"
  }
))["outputs"][0];

API Endpoints

Image Face Swap

Model ID: wavespeed-ai/image-face-swap

Replace a face in an image with a reference face.

Parameters

Parameter	Type	Required	Default	Description
image	string	Yes	--	URL of the image containing the face to replace
face_image	string	Yes	--	URL of the reference face image to swap in
target_index	integer	No	0	Which face to replace (0 = largest face, 1-10 for others)
output_format	string	No	jpeg	Output format. One of: jpeg, png, webp

Example

javascript

import wavespeed from 'wavespeed';

const imageUrl = await wavespeed.upload("/path/to/group-photo.png");
const faceUrl = await wavespeed.upload("/path/to/reference-face.png");

const output_url = (await wavespeed.run(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl,
    target_index: 0,
    output_format: "png"
  }
))["outputs"][0];

Targeting a Specific Face

When multiple people are in the image, use target_index to select which face to replace:

javascript

// Replace the second-largest face in the image
const output_url = (await wavespeed.run(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl,
    target_index: 1
  }
))["outputs"][0];

Video Face Swap

Model ID: wavespeed-ai/video-face-swap

Replace a face in a video with a reference face. Supports videos up to 10 minutes.

Parameters

Parameter	Type	Required	Default	Description
video	string	Yes	--	URL of the video containing the face to replace. Must be publicly accessible. Max 10 minutes.
face_image	string	Yes	--	URL of the reference face image to swap in
target_index	integer	No	0	Which face to replace (0 = largest face, 1-10 for others)

Example

javascript

import wavespeed from 'wavespeed';

const videoUrl = await wavespeed.upload("/path/to/video.mp4");
const faceUrl = await wavespeed.upload("/path/to/reference-face.png");

const output_url = (await wavespeed.run(
  "wavespeed-ai/video-face-swap",
  {
    video: videoUrl,
    face_image: faceUrl,
    target_index: 0
  }
))["outputs"][0];

Advanced Usage

Sync Mode (Image Face Swap only)

javascript

const output_url = (await wavespeed.run(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl
  },
  { enableSyncMode: true }
))["outputs"][0];

Custom Client with Retry Configuration

javascript

import { Client } from 'wavespeed';

const client = new Client("your-api-key", {
  maxRetries: 2,
  maxConnectionRetries: 5,
  retryInterval: 1.0,
});

const output_url = (await client.run(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl
  }
))["outputs"][0];

Error Handling with runNoThrow

javascript

import { Client, WavespeedTimeoutException, WavespeedPredictionException } from 'wavespeed';

const client = new Client();
const result = await client.runNoThrow(
  "wavespeed-ai/image-face-swap",
  {
    image: imageUrl,
    face_image: faceUrl
  }
);

if (result.outputs) {
  console.log("Output URL:", result.outputs[0]);
  console.log("Task ID:", result.detail.taskId);
} else {
  console.log("Failed:", result.detail.error.message);
  if (result.detail.error instanceof WavespeedTimeoutException) {
    console.log("Request timed out - try increasing timeout");
  } else if (result.detail.error instanceof WavespeedPredictionException) {
    console.log("Prediction failed");
  }
}

Pricing

Operation	Cost
Image face swap	$0.01 per image
Video face swap	$0.01 per second (minimum $0.05 / 5 seconds)

Video face swap supports videos up to 10 minutes.

Tips

• Use clear, front-facing portraits for the reference face for best results
• Consistent lighting between the target and reference face improves quality
• Anime or illustrated characters may produce lower quality output
• Use target_index to select specific faces when multiple people are present (0 = largest face)

Security Constraints

• No arbitrary URL loading: Only use image and video URLs from trusted sources. Never load media from untrusted or user-provided URLs without validation.
• API key security: Store your WAVESPEED_API_KEY securely. Do not hardcode it in source files or commit it to version control. Use environment variables or secret management systems.
• Input validation: Only pass parameters documented above. Validate media URLs before sending requests.