The available documentation does not verify that a Chrome extension called URLbox supports custom viewport sizes—or establish how to set them. Urlbox’s official materials document viewport settings for its screenshot API instead. If you meant that API, set the width and height parameters in pixels; the example below is not a verified extension URL.
Can you set a custom viewport in the URLbox Chrome extension?
Extension-specific instructions cannot be confirmed from the available Urlbox documentation. It does not establish that the extension in the title is Urlbox’s service or explain how to edit an extension URL. So there is no verified extension URL template or sequence of Chrome steps to provide.
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Before following instructions for an extension, confirm its exact name and publisher in the Chrome Web Store, then consult that extension’s own help page. Do not assume that Urlbox API parameters work in a Chrome extension.
If you meant the Urlbox screenshot API
Urlbox documents width and height as browser viewport dimensions in pixels. The documented defaults are 1280 pixels wide by 1024 pixels high. The official quick start shows a render-link example using a 390-by-844-pixel viewport:
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https://api.urlbox.com/v1/api-key/png?url=github.com&width=390&height=844&thumb_width=200
That is an API example, not a confirmed URL for a Chrome extension. The official documentation describes Urlbox as an API for rendering URLs and HTML into screenshots, PDFs, videos, and extracted content. It does not prescribe one viewport size for every use.
For API details, see Urlbox documentation and its render options.
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For automated screenshots, ScreenshotNeo takes a URL in one API request and returns an image or PDF. Its clean-shot steps accept consent banners and remove more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing status. An MCP server provides screenshot tools for AI agents, including Claude and Cursor.
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