ApiFlash handles a multi-URL screenshot job as one authenticated /v1/urltoimage request per URL. Build a request for each address, then run them sequentially or concurrently; when parallelizing, control the request rate and record each result against its source URL.
How the multi-URL workflow works
ApiFlash’s documented endpoint is https://api.apiflash.com/v1/urltoimage. It does not turn a list of URLs into a single screenshot: your code submits a separate capture request for every target. Each target URL must be complete, including https:// or http://, and each request must include a valid access key obtained from your ApiFlash account dashboard. The API accepts GET query parameters or POST form data. See the ApiFlash API documentation.
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- Collect and validate the input URLs.
- Create one correctly encoded API request for each URL.
- Choose image bytes or JSON response mode.
- Save or consume each result while retaining its input URL.
- Handle errors per URL so one failed capture does not hide successful results.
Choose sequential or concurrent requests
Sequential processing is simplest and can suit a short list. Concurrent requests can reduce elapsed time for a larger batch, but they add coordination: limit request starts, preserve the URL-to-result association, and handle each error independently. ApiFlash’s guide says there is no separate cap on the number of concurrent requests, but its request-rate limit still applies. The guide was last updated January 25, 2023: Capture Screenshots in Parallel.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe API documentation describes a leaky-bucket limit of 20 requests per second with a burst size of 400. Requests exceeding the burst are terminated with HTTP 429. These are ApiFlash-published limits, not an independent performance measurement; check the current documentation before relying on them in a production workflow.
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Sequential pattern
Loop through the URL list and wait for each request to finish before starting the next. This makes progress and retries easy to reason about, at the cost of total batch duration.
Concurrent pattern
Use a bounded worker pool or throttle request starts to stay within the published rate. Do not assume that allowing many in-flight requests means you may start them all at once. Store each task’s source URL or index with its response, and retry only the failed item when appropriate.
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Choose the response format
By default, the endpoint returns image bytes directly. This is convenient when your code wants to write each screenshot to a file or upload it to storage. Set response_type=json when your workflow needs a screenshot link; JSON mode can also include extracted HTML or text when those options are requested. Keep names tied to input URLs—for example, by using a stable index or a sanitized hostname—rather than relying on completion order, which may differ when requests run concurrently.
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ApiFlash’s documented defaults are JPEG output, a 1920×1080 viewport, a non-full-page capture, and a direct image response. Its API also documents options for PNG or WebP, full-page capture, custom viewport dimensions, cache freshness with fresh, cache TTL, quality, scrolling, CSS selectors, cookies, headers, user-agent emulation, geographic and time-zone settings, and optional HTML or text extraction with JSON responses. Some options may be plan-dependent, so verify their availability in your current account documentation before building them into a workflow.
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Pages that render late
For content that appears after initial page load, consider wait_for or wait_until rather than adding an arbitrary fixed delay. ApiFlash documents that wait_for aborts if its selector does not appear within 15 seconds. Choose a selector that is specific to the content you need, and treat a missing selector as a per-URL capture failure.
Protect the access key
An access key is an authentication secret. If users trigger screenshots from your site or application, do not place the key in browser-visible JavaScript or expose it in a URL users can inspect. Proxy requests through your server and add the key there. ApiFlash’s guides include an official guide index with an Nginx proxy example; the guide recommends restricting target URLs and rate-limiting the exposed proxy so others cannot freely consume your account quota.
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Handle failures per URL
Check the HTTP status and response for every request. A successful batch may contain failed individual captures, so record the target, status, and useful error details separately.
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| Status | Documented meaning | What to check |
|---|---|---|
| 400 | Invalid parameters or an uncapturable target | Check parameter names and values, URL encoding, and whether the target can be reached and captured. |
| 401 | Invalid or revoked key | Confirm the key is current, correctly supplied, and not accidentally altered. |
| 402 | Monthly screenshot quota exhausted | Check account usage and quota before resubmitting the batch. |
| 403 | Feature unsupported by the plan | Check the account’s plan and remove or replace the unavailable option. |
| 429 | Rate limit exceeded | Reduce or throttle request starts, then retry with backoff rather than immediately repeating the burst. |
| 500 | Internal capture failure | Record the affected URL and retry selectively after a delay. |
ApiFlash also documents that exact repeated requests that fail are rate-limited to five per hour. Avoid tight retry loops for an unchanged failing request; correct the cause first or defer a retry. The status meanings and limits above are from the official API documentation.
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Or skip the browser setup
ScreenshotNeo offers a one-request-per-URL screenshot API at screenshotneo.com. Its API accepts a URL and returns PNG, JPEG, WebP, or PDF. See the ScreenshotNeo documentation.
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 or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server provides screenshot tools for AI agents, and the Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.
FAQ
Can one ApiFlash request capture several URLs?
No. The documented workflow sends one authenticated endpoint request for each target URL.
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Can I pass the URL list from a browser?
You can submit user-selected URLs to your own server, but keep the ApiFlash key on the server side and restrict and rate-limit the proxy.
Quick Recap
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