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To capture a mobile-sized webpage screenshot with ApiFlash, send a request to its screenshot endpoint with the target URL and explicit width and height values. Add a mobile-oriented user_agent if the site needs to identify the request as mobile traffic. This sets a mobile-sized viewport and User-Agent; ApiFlash’s documentation does not guarantee that it reproduces every physical-device behavior or a particular phone model exactly.
Make a mobile-sized ApiFlash request
ApiFlash’s endpoint is https://api.apiflash.com/v1/urltoimage. You need an access key and the complete page URL. The documented default viewport is 1920 by 1080 pixels, so specify narrower dimensions for a mobile-sized capture.
Request URL template
Replace the placeholders with your access key, target URL, and a mobile browser User-Agent string appropriate to your use. URL-encode parameter values when needed.
https://api.apiflash.com/v1/urltoimage?access_key=YOUR_ACCESS_KEY&url=https%3A%2F%2Fexample.com&width=390&height=844&user_agent=MOBILE_USER_AGENT&format=pngThe example requests a 390-by-844-pixel viewport and PNG output. Those dimensions are an example, not a guarantee that the result matches a specific phone. Choose dimensions that suit the viewport you want to inspect.
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cURL with POST form data
ApiFlash documents GET query parameters and POST form data. POST keeps the access key out of the URL, but it is still a secret: run requests in a trusted environment and do not publish credentials in client-side code or logs.
curl -X POST "https://api.apiflash.com/v1/urltoimage"
-d "access_key=YOUR_ACCESS_KEY"
--data-urlencode "url=https://example.com"
-d "width=390"
-d "height=844"
--data-urlencode "user_agent=MOBILE_USER_AGENT"
-d "format=png"
-o mobile.pngReplace YOUR_ACCESS_KEY and MOBILE_USER_AGENT. For a GET request, put those same parameters in the query string and URL-encode values such as the target URL and CSS selectors. Consult the ApiFlash documentation for the service’s current parameter details.
Choose the capture behavior and output
Viewport or full page
Leave full_page unset or false to capture the requested viewport. Set full_page=true when you want the whole page height; in that mode, height is ignored. A full-page capture answers a different question from a fixed-height mobile viewport screenshot.
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Mobile User-Agent and device limits
The user_agent parameter sets the User-Agent header and can make a request identify as a mobile browser. Use it when the target site serves different content based on that header. Do not treat a User-Agent plus viewport dimensions as proof of complete device emulation: the cited documentation does not establish that every device-specific behavior, such as touch input or an exact device profile, is reproduced.
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Format, quality, and scale
formatacceptspng,jpeg, orwebp. The documented default is JPEG.qualityadjusts JPEG and WebP quality; the documented default is 80. Higher quality can increase file size.scale_factoraccepts 1 or 2. A factor of 2 produces a higher-definition image and a larger file.
ApiFlash documents a maximum dimension of 16,350 pixels and a maximum width-times-height area of 33,177,600 pixels. For WebP, the maximum dimensions apply after the scale factor, so account for that when requesting a larger scale.
Wait for the content you need
ApiFlash says it waits for network idle by default. If the page renders a particular element later, use wait_for with its CSS selector. Use delay for an additional fixed wait only when needed; its documented default is zero and its maximum is 10 seconds. The FAQ recommends selector or load-state waits over arbitrary delays where practical.
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Get image data or JSON
By default, the response is image data with content headers. Set response_type=json to receive JSON with links to the screenshot and, where available, extracted HTML and text. Choose the response type that fits whether your code needs the image directly or a response containing links and page data.
Options that affect reliability and workflow
- Fresh captures and cache:
fresh=truerequests a new capture instead of a cached result; it does not delete the previous cached result for the same parameters.ttlcontrols cache retention, with a documented range from 0 to 2,592,000 seconds. - Cookie banners and page elements: Other documented controls include
no_cookie_banners, element selection, and cropping. - Network and page setup: ApiFlash documents controls for ads, tracking, CSS or JavaScript injection, cookies, headers, proxy settings, location, and time zone. Feature availability can depend on plan; the documentation identifies HTTP 403 when a feature is unsupported by the current plan.
- Storage: S3 export is among the documented options.
For a complete list and current parameter syntax, refer to the official API documentation. Avoid adding custom headers without checking their effects: ApiFlash’s FAQ says custom headers apply to all requests and can interfere with external font requests.
Limits, quota, and rendering caveats
Rate limits and quota behavior
ApiFlash documents a rate of 20 requests per second with a burst size of 400. Requests above the rate are delayed; requests exceeding the burst can receive HTTP 429. Identical failed captures are limited to five requests per hour. Successful captures expose quota headers, and the service documents a quota endpoint. Its FAQ says cached and failed screenshots do not count toward monthly quota, while exhausting plan quota returns HTTP 402.
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Fonts and browser environment
According to the ApiFlash FAQ, captures use Chrome running on Linux. System fonts can therefore differ from those on Windows or macOS. If appearance depends on typography, serving your own web fonts is more reliable than relying on operating-system fonts.
Bot protection
Some sites with bot protection may block capture requests despite ApiFlash’s attempts to access them. The FAQ says a proxy may help depending on the protection, but it is not a guaranteed workaround.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common problems
- The result is desktop-sized: Set
widthandheightexplicitly; the documented defaults are 1920 by 1080 pixels. - The site serves its desktop layout: Add a mobile-oriented
user_agentif the site varies its response by User-Agent. Viewport and header changes do not guarantee exact physical-device emulation. - Content is missing from the screenshot: Wait for a specific element with
wait_for, or use a suitable additionaldelay. Check whether the element actually appears in the page and whether its selector is correct. - You receive HTTP 429: Reduce request rate or burst size; the documented limit is 20 requests per second with a burst of 400.
- You receive HTTP 402: The FAQ associates this response with exhausted plan quota. Check quota information and the response headers.
- You receive HTTP 403 for an option: The docs identify this as the response for a feature unsupported by the current plan. Check the plan’s feature availability.
- The capture fails on a protected site: Bot protection may block the request. The FAQ notes that a proxy can help in some cases, but does not guarantee access.
- Typography or external fonts look wrong: Captures run in Chrome on Linux, and custom headers apply to all requests. Serve site fonts directly and review custom headers that could affect font loading.
- The output is unexpectedly large or rejected: Check maximum dimensions and total viewport area, and remember that
scale_factor=2increases output size and affects WebP maximum dimensions.
ApiFlash pricing context
ApiFlash’s homepage listed the following monthly plans when its pricing was researched in 2026. Pricing and plan details are volatile; check the live ApiFlash homepage before choosing a plan.
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| Plan | Monthly price shown | Monthly screenshots shown |
|---|---|---|
| Free | $0 | 100 |
| Lite | $7 | 1,000 |
| Medium | $35 | 10,000 |
| Large | $180 | 100,000 |
The homepage advertises mobile screenshots as a feature on listed plans. The quota behavior and feature eligibility described in the documentation still matter when estimating a workflow; do not assume every optional control is available on every plan.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server for developers. Its one-call API can return an image or PDF, while handling common cleanup before capture. For example, this cURL request saves a WebP screenshot of Stripe:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for parameters and setup. Cookie banners, popups, and chat widgets are removed before the shot; bot checks, blank pages, and failed loads are never billed. An MCP server lets AI agents take screenshots, and the Free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up free for ScreenshotNeo.
Frequently Asked Questions
Does setting a mobile User-Agent make the capture identical to a real phone?
No. ApiFlash documents setting the User-Agent, but that does not establish full physical-device behavior or an exact model-specific simulation.
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Yes. Use the documented wait_for parameter with the element’s CSS selector; a selector wait is preferable to an arbitrary delay when possible.
Quick Recap
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.
