curl --request POST \
  --url https://transform.unstructured.io/api/v2/upload \
  --header 'Content-Type: multipart/form-data' \
  --header 'unstructured-api-key: <api-key>' \
  --form file=@example-file

import requests

url = "https://transform.unstructured.io/api/v2/upload"

files = { "file": ("example-file", open("example-file", "rb")) }
headers = {"unstructured-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: {'unstructured-api-key': '<api-key>'}};

options.body = form;

fetch('https://transform.unstructured.io/api/v2/upload', 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://transform.unstructured.io/api/v2/upload",
  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",
    "unstructured-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://transform.unstructured.io/api/v2/upload"

	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("unstructured-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://transform.unstructured.io/api/v2/upload")
  .header("unstructured-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://transform.unstructured.io/api/v2/upload")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["unstructured-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

{
  "file_id": "file_01HZX6J9Q4F3T4HY6F9W8D9K2R",
  "mimetype": "application/pdf",
  "expires_at": "2026-09-01T18:25:43Z"
}

{
  "code": "invalid_input",
  "message": "Missing or invalid file."
}

{
  "code": "unauthorized",
  "message": "Authentication required: send either an 'unstructured-api-key' header or 'Authorization: Bearer <token>'."
}

{
  "code": "file_too_large",
  "message": "The file exceeds the maximum upload size."
}

{
  "code": "unsupported_file_type",
  "message": "Check the file extension and try again."
}

{
  "code": "internal_error",
  "message": "The file operation could not be completed. Retry the request."
}