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Set a custom User-Agent with the screenshot API’s documented option for that provider: Cloudflare Browser Run uses userAgent in a JSON body, while ScreenshotOne documents user_agent as a request parameter. The names and request formats are not universal. A User-Agent changes a request characteristic; it does not set the viewport or guarantee access past bot protection.
Choose the provider’s exact User-Agent option
First identify whether your screenshot endpoint accepts a JSON POST body or GET query parameters. Then use the dedicated field documented for that endpoint, preserving its spelling and casing. Do not assume that an option named User-Agent, userAgent, or user_agent works across providers.
- Cloudflare Browser Run: pass
userAgentas a top-level JSON parameter. Cloudflare says this setting does not bypass bot protection; requests remain identifiable as bot traffic through headers that cannot be changed. Cloudflare Browser Run screenshot endpoint. - ScreenshotOne: set
user_agentin the request. Its documented example usesuser_agent=screenshoter. The default is the latest version of the browser used by Puppeteer. ScreenshotOne says aviewport_devicesetting overridesuser_agent, and warns that changing the value may affect stealth-mode capabilities. ScreenshotOne options. - Other providers: Screenshots.Dev, ScreenshotRun, Screenshot Machine and ScreenshotCenter also document a
user_agentparameter, but confirm the current casing and encoding in the specific API documentation before adapting code. See Screenshots.Dev docs, ScreenshotRun device docs, and Screenshot Machine API.
The example below shows the Cloudflare-style field name only. It is illustrative, not a tested request; use a truthful, appropriate value for the compatibility condition you intend to test.
{
"url": "https://example.com/",
"userAgent": "Mozilla/5.0 (compatible; ExampleBot/1.0)"
}Keep User-Agent separate from device emulation
The HTTP User-Agent header is a string that can identify aspects of the requesting application, operating system, vendor, or version. It is only one input that a server may use when selecting content. See MDN’s User-Agent header reference.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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A mobile-looking User-Agent does not make a capture a complete mobile-device simulation. It does not, by itself, set screen dimensions, device pixel ratio, touch behavior, or browser engine. Configure those independently using the provider’s documented viewport, device, scale, or browser options. Cloudflare’s screenshot API schema lists userAgent separately from setExtraHTTPHeaders and includes viewport configuration; ScreenshotOne also documents separate viewport and device-scale controls. Cloudflare Browser Rendering screenshot API · ScreenshotOne options.
If the purpose is mobile-layout comparison, set the viewport and relevant mobile or touch controls as well as the User-Agent. Check option precedence: ScreenshotOne documents that viewport_device overrides user_agent. A custom string does not guarantee that the site will return a particular variant.
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- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Verify the value reached the page
- Check the API documentation for the exact endpoint, HTTP method, field name and encoding.
- Set the User-Agent using the dedicated option where one is documented. If the API also supports generic extra headers, do not assume it handles User-Agent identically.
- Capture a page that reports the User-Agent it received, or inspect the returned page content, and compare that value with the one you sent.
- If the result is unexpected, check for a device-preset override, redirects, or server-side content selection. The header alone cannot establish which page variant a site must serve.
Changing a User-Agent can also have privacy implications because header information may contribute to fingerprinting; browsers may limit information exposed through the header and related APIs. MDN.
What a custom User-Agent cannot do
Do not use a custom string as an access-control workaround or claim to be a browser or device you are not testing as. Cloudflare explicitly says its configurable User-Agent does not bypass bot protection, and ScreenshotOne warns that overriding its default may affect stealth-mode capabilities. A page may still block, challenge, or serve different content based on signals beyond the User-Agent.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Local alternative: shot-scraper
If you want to run captures locally rather than use a hosted API, shot-scraper documents the --user-agent TEXT option. Its documentation lists support for Chromium, Firefox, WebKit, Chrome and Chrome Beta; consult the current CLI docs for complete syntax and setup. shot-scraper documentation.
Or skip the browser setup
ScreenshotNeo accepts a URL in one GET request and returns a screenshot or PDF. Its user_agent option is documented alongside its other request parameters; see the ScreenshotNeo API docs. Example using the API’s default User-Agent:
Rank #4
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- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie and consent banners and removes more than 60 known consent platforms, newsletter popups and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing status. An MCP server offers take_screenshot, get_page_info and capture_pdf for AI agents. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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- The API ignores the value: verify the option’s exact spelling, casing, HTTP method and encoding against the endpoint docs. A field for a different product or API endpoint may not be accepted.
- The request errors after adding User-Agent: check whether the endpoint expects JSON or query parameters and whether the value is in the documented location. Do not move a JSON-body field into a query string without documentation.
- The page still looks desktop-sized: User-Agent does not set viewport dimensions or other device-emulation properties. Configure those separately.
- A device preset changes the result: inspect precedence rules. ScreenshotOne states that
viewport_deviceoverridesuser_agent. - The site still blocks or challenges the capture: a custom value is not a bypass for bot protection. Cloudflare says its Browser Run requests remain identifiable as bot traffic.
- Changing the default affects behavior: ScreenshotOne warns that a custom User-Agent may break stealth-mode capabilities. Restore the provider default if you do not need the override.
Provider options and browser behavior can change; verify the endpoint’s live documentation before deploying an integration.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Frequently Asked Questions
Is the User-Agent option the same across screenshot APIs?
No. For example, Cloudflare Browser Run uses userAgent in a JSON body, while ScreenshotOne documents user_agent as a request parameter.
Does setting a mobile User-Agent make the screenshot a mobile-device capture?
No. Set viewport and other device-emulation controls separately; the User-Agent alone does not specify them.
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