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Freedom251 › Blog › API

How to Set the Viewport Size in a URL2PNG Screenshot

By Freedom251 Team · · 3 min read

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For URL2PNG’s v6 API, set the browser viewport with the viewport query parameter in WIDTHxHEIGHT format—for example, viewport=1280x800. Add it to the request parameters before generating the request token, because the token is based on the complete query string and your secret key.

Set the viewport with the viewport parameter

Choose the browser width and height in pixels, separated by a lowercase x. For example, viewport=1280x800 requests a 1280-pixel-wide by 800-pixel-high viewport. URL2PNG’s v6 documentation gives viewport=500x500 as an example.

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A request URL has this general shape:

https://api.url2png.com/v6/{APIKEY}/{TOKEN}/png/?url={ENCODED_TARGET}&viewport=1280x800

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This is schematic, not a ready-to-use URL: encode the target URL and generate a valid token using your own credentials and the complete request query string, following URL2PNG’s signing instructions. Do not reuse a token from an example.

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Build and sign the request in the right order

  1. Choose explicit dimensions. For example, use 1280x800 for a desktop-sized viewport. The first number is width; the second is height.
  2. Add the option to the request parameters. Include viewport=1280x800 with url and any other options.
  3. Generate the token after assembling the parameters. URL2PNG documents the token as an MD5 hash of the entire query string plus the secret key. Follow its official language-specific sample for exact encoding, serialization, and token construction.
  4. Send the request URL. The API returns the requested output format, such as PNG.

In code, the important placement is before signing:

params = {"url": target_url, "viewport": "1280x800", "fullpage": "false"}

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This illustrates the parameter dictionary only. Use URL2PNG’s documentation for the exact signing implementation in your language.

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Viewport size, full-page capture, and image scaling are different settings

Setting What it controls Example or behavior
viewport The browser viewport dimensions used for the capture. 1280x800 sets width and height in pixels.
fullpage Whether URL2PNG attempts to capture the whole document canvas rather than only the viewport. Set fullpage=true for the full document. The documented default is false.
thumbnail_max_width The maximum width of the returned thumbnail image; it is an output-scaling control, not a browser viewport setting. Use it when you need to constrain output image width, independently of the viewport.

Set fullpage separately from viewport. A full-page capture does not change the requested browser viewport dimensions.

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Do not rely on an assumed default

URL2PNG’s advanced-options list gives 1480x1037 as the current default, while an embedded Python helper on the same documentation page initializes viewport arguments to 1280x1024. Since those examples conflict, explicitly set the dimensions you need rather than relying on an implicit default. The documentation reviewed here does not establish a universal maximum viewport size.

Using URL2PNG through Cloudinary

With Cloudinary’s URL2PNG add-on, the option goes in the add-on path rather than the direct API query string. The documented form is similar to /url2png/viewport=640x1136|fullpage=false. See Cloudinary’s URL2PNG add-on documentation for the integration syntax.

Cloudinary says these URLs generally need to be signed or eagerly generated by default, unless unsigned add-on transformations have been enabled in account security settings. That signing workflow is separate from constructing a direct URL2PNG v6 API request.

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Or skip the browser setup

ScreenshotNeo offers a single GET request for a screenshot, without building a browser capture flow yourself. The API documentation has the available request options.

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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

ScreenshotNeo accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers identify the page verdict and whether the request was billed. Its MCP server provides screenshot tools for AI agents, including Claude and Cursor. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo’s free plan.

Frequently Asked Questions

Should the separator in a viewport value be uppercase or lowercase?

Use a lowercase x, as in 1280x800.

Does fullpage=true set a larger viewport?

No. It asks URL2PNG to attempt the whole document canvas; viewport separately sets browser width and height.

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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

APICloudinaryURL2PNGviewportwebsite screenshots

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