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Upload files to websites using Playwright, Puppeteer, or Selenium. The approach varies by framework:

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Playwright

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Direct upload

With Playwright, upload files directly from your local path. After creating and connecting to a session, follow these steps:
  1. Make sure your file is available where you’re running your Playwright code
  2. Use the setInputFiles method to upload the file
  3. The file path should be relative to your current working directory
Playwright
import { chromium } from "playwright-core";
import { Browserbase } from "@browserbasehq/sdk";

(async () => {
  const bb = new Browserbase({ apiKey: process.env.BROWSERBASE_API_KEY! });
  const session = await bb.sessions.create();

  const browser = await chromium.connectOverCDP(session.connectUrl);
  const defaultContext = browser.contexts()[0];
  const page = defaultContext.pages()[0];

  await page.goto("https://browser-tests-alpha.vercel.app/api/upload-test");

  const fileInput = page.locator("#fileUpload");
  // logo.png is available relative to the current working directory
  await fileInput.setInputFiles("logo.png");
})().catch((error) => console.error(error));

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Large file uploads

For larger files, use the Session Uploads API: 
// ⭐️⭐️⭐️ IMPORTANT: Set your file name below
const fileName = "YOUR_FILE_NAME.EXAMPLE";
// ⭐️⭐️⭐️

import { chromium } from "playwright-core";
import { Browserbase } from "@browserbasehq/sdk";
import * as fs from "fs";

const apiKey = process.env.BROWSERBASE_API_KEY!;

async function upload() {
  // 1. Initialize Browserbase Client
  console.log("✨ Initializing Browserbase client");
  const bb = new Browserbase({ apiKey });

  // 2. Create Browser Session
  console.log("🚀 Creating new browser session");
  const session = await bb.sessions.create();

  // 3. Upload file via the Uploads API
  console.log("⬆️ Uploading file");
  try {
    const fileStream = fs.createReadStream(fileName);
    const result = await bb.sessions.uploads.create(session.id, {
      file: fileStream,
    });
    console.log(`✅ Upload successful: ${JSON.stringify(result)}`);
  } catch (error) {
    console.error(`❌ Upload failed... exiting: ${error}`);
    return;
  }

  // 4. Connect to the Session
  console.log("🔗 Connecting to browser session");
  const browser = await chromium.connectOverCDP(session.connectUrl);
  const defaultContext = browser.contexts()[0];
  const page = defaultContext.pages()[0];

  // 5. Get Live View link for remote debugging
  const liveViews = await bb.sessions.debug(session.id);
  console.log("🔍 Live View link:", liveViews.debuggerUrl);

  // 6. Use the Browser
  console.log("🌐 Navigating to page: upload-test");
  await page.goto("https://browser-tests-alpha.vercel.app/api/upload-test", {
    waitUntil: "domcontentloaded",
  });

  // Set up CDP client for additional controls
  const cdpSession = await defaultContext.newCDPSession(page);
  const root = await cdpSession.send("DOM.getDocument");

  // Find the input element
  const inputNode = await cdpSession.send("DOM.querySelector", {
    nodeId: root.root.nodeId,
    selector: "#fileUpload",
  });

  // Use DOM.setFileInputFiles CDP command
  const remoteFilePath = `/tmp/.uploads/${fileName}`;
  await cdpSession.send("DOM.setFileInputFiles", {
    files: [remoteFilePath],
    nodeId: inputNode.nodeId,
  });

  console.log("⌛ Waiting for 60 seconds: allow time for 1) file upload and 2) to see the file upload...");
  await new Promise((resolve) => setTimeout(resolve, 60000));

  // 7. Cleanup
  console.log("👋 Closing browser session");
  await page.close();
  await browser.close();

  // 8. Session Recording Link
  console.log("\n" + "─".repeat(60));
  console.log(`
🎥  Your session dashboard is ready
  https://www.browserbase.com/sessions/${session.id}`);
}

// Execute the main function
upload().catch((error) => console.error(error));

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Manual upload through Live View

When using Live View, clicking a file input triggers the browser’s native file picker. Since the browser runs remotely on Browserbase infrastructure, it can’t access files on your local machine. To handle manual uploads through Live View, intercept file chooser events and upload programmatically:
  1. Detect file input clicks using Playwright’s page.on('filechooser') event
  2. Show your own file picker (e.g., a native OS picker or web UI) to select a local file
  3. Upload the file via the Session Uploads API
  4. Attach the file to the input element using CDP’s DOM.setFileInputFiles
See the following example script for a complete implementation.

Session uploads API

Learn more about the available params and response fields