Changelog (25)

Last updated Apr 21, 2026 This is a detailed changelog of every update to Browser Run (formerly Browser Rendering). For a higher-level summary of major updates to every Cloudflare product, including Browser Run, visit developers.cloudflare.com/changelog.

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2026-09-21

Browser binding session and DevTools methods

• Browser Run browser bindings now support typed methods for acquiring and connecting to sessions, launching a browser with outbound Worker routing, creating Live View URLs, and managing session lifecycle.
• Added a nested devtools binding with methods for browser version and protocol information, listing and creating targets, and activating or closing targets. See the Browser binding API reference for the full API.

2026-07-28

Structured handoff for Human in the Loop

• Human in the Loop now supports structured handoff using Cloudflare-specific CDP commands. Your script calls Cloudflare.handoff with instructions for the human operator and waits for a Cloudflare.handoffComplete event, replacing the need to manually poll for completion. Refer to the Human in the Loop documentation for examples and best practices.

2026-07-07

New endpoint: /accessibilityTree

• Added the /accessibilityTree endpoint to capture the accessibility tree from a rendered webpage. The accessibility tree includes roles, names, values, states, and hierarchy, giving AI agents and automation workflows a structured view of page elements without parsing raw HTML or interpreting screenshots. You can capture the full page tree, return only semantically meaningful nodes with interestingOnly, or capture a subtree with root.

2026-06-12

New tutorial: Pre-render pages for crawlers

• Added a new tutorial on how to pre-render JavaScript-heavy pages using Browser Run and a Worker. The tutorial covers building a pre-rendering endpoint that calls the /content Quick Action to render pages in managed headless Chrome and return crawler-ready HTML for search crawlers, social preview bots, AI indexing jobs, or partner integrations.

2026-06-11

New formats parameter for /snapshot

• The /snapshot endpoint now supports a formats parameter that lets you return multiple page formats in a single API call. Previously, /snapshot returned only HTML content and a screenshot. You can now also include Markdown and the accessibility tree in the same response. Refer to the /snapshot documentation for usage examples and accepted values.

2026-05-28

Use Quick Actions directly from Workers

• You can now call Quick Actions directly from a Worker using the quickAction() method on the browser binding. This removes the need for API tokens or external HTTP requests when using Quick Actions within Workers. Supported actions include screenshot, PDF, content, markdown, JSON, scrape, links, and snapshot. The quickAction() method requires a compatibility date of 2026-03-24 or later.

2026-04-15

@cloudflare/playwright v1.3.0 released

• Released version 1.3.0 of @cloudflare/playwright. Starting with this version, the library uses the standard CDP (Chrome DevTools Protocol) internally to communicate with Browser Run, replacing the previous chunked protocol. This aligns with Browser Run's full CDP support and prevents compatibility issues when using the latest compatibility dates. If you encounter any issues, you can downgrade by setting a compatibility_date prior to 2026-03-17 or by adding the no_websocket_standard_binary_type flag. Refer to the @cloudflare/playwright README for details.

2026-04-15

Higher concurrency limits

• Increased the default concurrent browser limit for Workers Paid plans from 30 to 120 per account.
• Increased new browser instance rate for Workers Paid plans from 30 per minute to 1 per second.
• Rate limits across the limits page are now expressed in per-second terms, matching how they are enforced.

2026-04-15

Live View

• Live View lets you see and interact with a remote browser session in real time. Use it to debug automation scripts, monitor what a browser is doing, or manually step in when a task requires human intervention. Access Live View from the Cloudflare dashboard, via the hosted UI at live.browser.run, or using native Chrome DevTools.

2026-04-15

Human in the Loop

• Human in the Loop lets a human step into a live browser session to handle what automation cannot, such as login pages, CAPTCHAs, or sensitive data entry, then hand control back to the script. Access any active session through Live View.

2026-04-15

Session Recordings

• Session Recordings captures DOM changes, mouse and keyboard events, and page navigation as structured data so you can replay any browser session after it ends. Enable recordings by passing recording: true when launching a browser. After the session closes, access recordings from the Runs tab in the Cloudflare dashboard or retrieve them via API.

2026-04-15

WebMCP support

• Browser Run now supports WebMCP (Web Model Context Protocol), which allows websites to declare structured tools that AI agents can discover and execute. WebMCP-enabled browsers are available through the experimental lab browser pool.

2026-04-14

Wrangler CLI commands for Browser Rendering

• Added wrangler browser commands to create, manage, and view browser sessions directly from the terminal. Available commands: create, close, list, and view. For full usage details, refer to Wrangler commands.

2026-04-13

@cloudflare/puppeteer v1.1.0 released

• Released version 1.1.0 of @cloudflare/puppeteer, which replaces the internal chunked protocol with plain CDP. This fixes a compatibility issue when using the latest compatibility dates.

2026-04-10

Chrome DevTools Protocol (CDP) and MCP client support

• Browser Rendering now exposes the Chrome DevTools Protocol (CDP) as an endpoint. Any CDP-compatible client, including Puppeteer and Playwright, can connect from any environment, whether that is Cloudflare Workers, your local machine, or a cloud environment. MCP clients like Claude Desktop, Claude Code, Cursor, and OpenCode can also use Browser Rendering as their remote browser.

2026-04-06

Local development: headful mode (experimental)

• You can now run Chrome in visible (headful) mode during local development by setting X_BROWSER_HEADFUL=true before running wrangler dev or vite dev. This makes it easier to visually debug your browser automation scripts. This feature is experimental and may change without notice.

2026-03-23

@cloudflare/playwright v1.2.0 released

• Released version 1.2.0 of @cloudflare/playwright, now upgraded to Playwright v1.58.2.

2026-03-17

Separate bot detection IDs for Browser Rendering methods

• Browser Rendering now uses separate bot detection IDs for the REST API and Browser Sessions versus the crawl endpoint, allowing you to identify and control each method independently. For the full list of IDs, refer to Automatic request headers.

2026-03-10

New REST API endpoint: /crawl (Beta)

• Added the /crawl endpoint (beta) to the REST API. The /crawl endpoint scrapes content from a starting URL and follows links across the site, up to a configurable depth or page limit. Responses can be returned as HTML, Markdown, or structured JSON (powered by Workers AI).

2026-03-04

Increased REST API rate limits

• Increased REST API rate limits for Workers Paid plans from 180 requests per minute (3 per second) to 600 requests per minute (10 per second). No action is needed to benefit from the higher limits.

2026-02-26

New tutorial: Generate OG images for Astro sites

• Added a new tutorial on how to generate OG images for Astro sites using Browser Rendering. The tutorial walks through creating an Astro template, using Browser Rendering to screenshot it as a PNG, and serving the generated images.

2026-02-24

Documentation updates for robots.txt and sitemaps

• Added robots.txt and sitemaps reference page with guidance on configuring robots.txt and sitemaps for sites accessed by Browser Rendering, including sitemap index files and caching headers.