Upload Asset
Uploads a file (image, video, audio, PDF, or SRT subtitle) and returns an asset_id for use in other endpoints. Max 32 MB. Supported types: png, jpeg, mp4, webm, mp3, wav, pdf, srt.
curl --request POST \
--url https://api.heygen.com/v3/assets \
--header 'Content-Type: multipart/form-data' \
--header 'x-api-key: <api-key>' \
--form file='@example-file'import requests
url = "https://api.heygen.com/v3/assets"
files = { "file": ("example-file", open("example-file", "rb")) }
headers = {"x-api-key": "<api-key>"}
response = requests.post(url, files=files, headers=headers)
print(response.text)const form = new FormData();
form.append('file', '<string>');
const options = {method: 'POST', headers: {'x-api-key': '<api-key>'}};
options.body = form;
fetch('https://api.heygen.com/v3/assets', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.heygen.com/v3/assets",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--",
CURLOPT_HTTPHEADER => [
"Content-Type: multipart/form-data",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.heygen.com/v3/assets"
payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-api-key", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.heygen.com/v3/assets")
.header("x-api-key", "<api-key>")
.body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.heygen.com/v3/assets")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--"
response = http.request(request)
puts response.read_body{
"data": {
"asset_id": "<string>",
"url": "<string>",
"mime_type": "<string>",
"size_bytes": 123
}
}{
"error": {
"code": "invalid_parameter",
"message": "File is required. Upload a file using multipart/form-data.",
"param": "file",
"doc_url": null
}
}{
"error": {
"code": "authentication_failed",
"message": "Invalid or expired API key. Verify your x-api-key header.",
"param": null,
"doc_url": null
}
}{
"error": {
"code": "request_in_progress",
"message": "A request with this Idempotency-Key is already in progress. Retry shortly.",
"param": null,
"doc_url": null
}
}{
"error": {
"code": "rate_limit_exceeded",
"message": "Too many requests. Retry after the duration specified in the Retry-After header.",
"param": null,
"doc_url": null
}
}Authorizations
HeyGen API key. Obtain from your HeyGen dashboard.
Headers
Optional client-supplied key for safely retrying mutations. Subsequent calls within 24 hours that share this key replay the original response — even if the request body differs slightly (a warning is logged). A retry that arrives while the original is still in flight gets a 409 request_in_progress. Keys must be 1–255 characters from [A-Za-z0-9_:.-]; a UUID is a safe default. Scope is per-endpoint and per-resource: the same key on a different route or path parameter is independent.
1 - 255^[A-Za-z0-9_\-:.]{1,255}$Body
File to upload (image, video, audio, PDF, or SRT subtitle). Max 32 MB.
Response
Successful response
Response from uploading an asset via POST /v3/assets.
Show child attributes
Show child attributes
curl --request POST \
--url https://api.heygen.com/v3/assets \
--header 'Content-Type: multipart/form-data' \
--header 'x-api-key: <api-key>' \
--form file='@example-file'import requests
url = "https://api.heygen.com/v3/assets"
files = { "file": ("example-file", open("example-file", "rb")) }
headers = {"x-api-key": "<api-key>"}
response = requests.post(url, files=files, headers=headers)
print(response.text)const form = new FormData();
form.append('file', '<string>');
const options = {method: 'POST', headers: {'x-api-key': '<api-key>'}};
options.body = form;
fetch('https://api.heygen.com/v3/assets', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.heygen.com/v3/assets",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--",
CURLOPT_HTTPHEADER => [
"Content-Type: multipart/form-data",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.heygen.com/v3/assets"
payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-api-key", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.heygen.com/v3/assets")
.header("x-api-key", "<api-key>")
.body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.heygen.com/v3/assets")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001--"
response = http.request(request)
puts response.read_body{
"data": {
"asset_id": "<string>",
"url": "<string>",
"mime_type": "<string>",
"size_bytes": 123
}
}{
"error": {
"code": "invalid_parameter",
"message": "File is required. Upload a file using multipart/form-data.",
"param": "file",
"doc_url": null
}
}{
"error": {
"code": "authentication_failed",
"message": "Invalid or expired API key. Verify your x-api-key header.",
"param": null,
"doc_url": null
}
}{
"error": {
"code": "request_in_progress",
"message": "A request with this Idempotency-Key is already in progress. Retry shortly.",
"param": null,
"doc_url": null
}
}{
"error": {
"code": "rate_limit_exceeded",
"message": "Too many requests. Retry after the duration specified in the Retry-After header.",
"param": null,
"doc_url": null
}
}
