--- name: assets description: Uploading images, videos, and audio for use in HeyGen video generation --- # Asset Upload and Management HeyGen allows you to upload custom assets (images, videos, audio) for use in video generation, such as backgrounds, talking photo sources, and custom audio. ## Upload Flow Asset uploads are a single-step process: POST the raw file binary directly to the upload endpoint. The Content-Type header must match the file's MIME type. ## Uploading an Asset **Endpoint:** `POST https://upload.heygen.com/v1/asset` ### Request | Header | Required | Description | |--------|:--------:|-------------| | `X-Api-Key` | ✓ | Your HeyGen API key | | `Content-Type` | ✓ | MIME type of the file (e.g. `image/jpeg`) | The request body is the raw binary file data. No JSON or form fields are needed. ### Response | Field | Type | Description | |-------|------|-------------| | `code` | number | Status code (`100` = success) | | `data.id` | string | Unique asset ID for use in video generation | | `data.name` | string | Asset name | | `data.file_type` | string | `image`, `video`, or `audio` | | `data.url` | string | Accessible URL for the uploaded file | | `data.image_key` | string \| null | Key for creating uploaded photo avatars (images only) | | `data.folder_id` | string | Folder ID (empty if not in a folder) | | `data.meta` | string \| null | Asset metadata | | `data.created_ts` | number | Unix timestamp of creation | ### curl ```bash curl -X POST "https://upload.heygen.com/v1/asset" \ -H "X-Api-Key: $HEYGEN_API_KEY" \ -H "Content-Type: image/jpeg" \ --data-binary '@./background.jpg' ``` ### TypeScript ```typescript import fs from "fs"; import path from "path"; interface AssetUploadResponse { code: number; data: { id: string; name: string; file_type: string; url: string; image_key: string | null; folder_id: string; meta: string | null; created_ts: number; }; msg: string | null; message: string | null; } async function uploadAsset(filePath: string, contentType: string): Promise { const resolvedPath = path.resolve(filePath); const fileBuffer = fs.readFileSync(resolvedPath); const response = await fetch("https://upload.heygen.com/v1/asset", { method: "POST", headers: { "X-Api-Key": process.env.HEYGEN_API_KEY!, "Content-Type": contentType, }, body: fileBuffer, }); const json: AssetUploadResponse = await response.json(); if (json.code !== 100) { throw new Error(json.message ?? "Upload failed"); } return json.data; } // Usage const asset = await uploadAsset("./background.jpg", "image/jpeg"); console.log(`Uploaded asset: ${asset.id}`); console.log(`Asset URL: ${asset.url}`); ``` ### TypeScript (with streams for large files) ```typescript import fs from "fs"; import path from "path"; import { stat } from "fs/promises"; async function uploadLargeAsset(filePath: string, contentType: string): Promise { const resolvedPath = path.resolve(filePath); const fileStats = await stat(resolvedPath); const fileStream = fs.createReadStream(resolvedPath); const response = await fetch("https://upload.heygen.com/v1/asset", { method: "POST", headers: { "X-Api-Key": process.env.HEYGEN_API_KEY!, "Content-Type": contentType, "Content-Length": fileStats.size.toString(), }, body: fileStream as any, // @ts-ignore - duplex is needed for streaming duplex: "half", }); const json: AssetUploadResponse = await response.json(); if (json.code !== 100) { throw new Error(json.message ?? "Upload failed"); } return json.data; } ``` ### Python ```python import requests import os def upload_asset(file_path: str, content_type: str) -> dict: with open(file_path, "rb") as f: response = requests.post( "https://upload.heygen.com/v1/asset", headers={ "X-Api-Key": os.environ["HEYGEN_API_KEY"], "Content-Type": content_type }, data=f ) data = response.json() if data.get("code") != 100: raise Exception(data.get("message", "Upload failed")) return data["data"] # Usage asset = upload_asset("./background.jpg", "image/jpeg") print(f"Uploaded asset: {asset['id']}") print(f"Asset URL: {asset['url']}") ``` ## Supported Content Types | Type | Content-Type | Use Case | |------|--------------|----------| | JPEG | `image/jpeg` | Backgrounds, talking photos | | PNG | `image/png` | Backgrounds, overlays | | MP4 | `video/mp4` | Video backgrounds | | WebM | `video/webm` | Video backgrounds | | MP3 | `audio/mpeg` | Custom audio input | | WAV | `audio/wav` | Custom audio input | ## Uploading from URL If your asset is already hosted online: ```typescript async function uploadFromUrl(sourceUrl: string, contentType: string): Promise { // 1. Validate and download the file const url = new URL(sourceUrl); if (url.protocol !== "https:") { throw new Error("Only HTTPS URLs are supported"); } const sourceResponse = await fetch(sourceUrl); const buffer = Buffer.from(await sourceResponse.arrayBuffer()); // 2. Upload directly to HeyGen const response = await fetch("https://upload.heygen.com/v1/asset", { method: "POST", headers: { "X-Api-Key": process.env.HEYGEN_API_KEY!, "Content-Type": contentType, }, body: buffer, }); const json: AssetUploadResponse = await response.json(); if (json.code !== 100) { throw new Error(json.message ?? "Upload failed"); } return json.data; } ``` ## Using Uploaded Assets ### As Background Image ```typescript const videoConfig = { video_inputs: [ { character: { type: "avatar", avatar_id: "josh_lite3_20230714", avatar_style: "normal", }, voice: { type: "text", input_text: "Hello, this is a video with a custom background!", voice_id: "1bd001e7e50f421d891986aad5158bc8", }, background: { type: "image", url: asset.url, // Use the URL from the upload response }, }, ], }; ``` ### As Talking Photo Source ```typescript const talkingPhotoConfig = { video_inputs: [ { character: { type: "talking_photo", talking_photo_id: asset.id, // Use the ID from the upload response }, voice: { type: "text", input_text: "Hello from my talking photo!", voice_id: "1bd001e7e50f421d891986aad5158bc8", }, }, ], }; ``` ### As Audio Input ```typescript const audioConfig = { video_inputs: [ { character: { type: "avatar", avatar_id: "josh_lite3_20230714", avatar_style: "normal", }, voice: { type: "audio", audio_url: asset.url, // Use the URL from the upload response }, }, ], }; ``` ## Complete Upload Workflow ```typescript async function createVideoWithCustomBackground( backgroundPath: string, script: string ): Promise { // 1. Upload background console.log("Uploading background..."); const background = await uploadAsset(backgroundPath, "image/jpeg"); // 2. Create video config const config = { video_inputs: [ { character: { type: "avatar", avatar_id: "josh_lite3_20230714", avatar_style: "normal", }, voice: { type: "text", input_text: script, voice_id: "1bd001e7e50f421d891986aad5158bc8", }, background: { type: "image", url: background.url, }, }, ], dimension: { width: 1920, height: 1080 }, }; // 3. Generate video with Video Agent console.log("Generating video..."); const response = await fetch("https://api.heygen.com/v3/video-agents", { method: "POST", headers: { "X-Api-Key": process.env.HEYGEN_API_KEY!, "Content-Type": "application/json", }, body: JSON.stringify({ prompt: "Create a product demo using the uploaded assets", files: [ { type: "asset_id", asset_id: logoAssetId }, { type: "asset_id", asset_id: bgAssetId }, ], }), }); const { data } = await response.json(); return data.video_id; } ``` ## Asset Limitations - **File size**: 10MB maximum - **Image dimensions**: Recommended to match video dimensions - **Audio duration**: Should match expected video length - **Retention**: Assets may be deleted after a period of inactivity ## Best Practices 1. **Optimize images** - Resize to match video dimensions before uploading 2. **Use appropriate formats** - JPEG for photos, PNG for graphics with transparency 3. **Validate before upload** - Check file type and size locally first 4. **Handle upload errors** - Implement retry logic for failed uploads 5. **Cache asset IDs** - Reuse assets across multiple video generations