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World desk4 min

How to Capture Mobile-Width Website Screenshots with Thumbalizr

Set Thumbalizr’s browser viewport with bwidth and bheight—not the thumbnail width—to inspect a site at a chosen narrow width. Learn capture modes, plan limits, API setup, and failure checks.
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To capture a website at a mobile-width browser viewport with Thumbalizr, set bwidth to the width you want to inspect and bheight to the visible viewport height. Choose size=screen for that viewport or size=page for a full-page capture. Do not confuse bwidth with width: the former controls the browser viewport, while the latter controls the output thumbnail width.

Set the rendered browser viewport, not just the image width

Thumbalizr’s API documentation says that “bwidth and bheight define the viewport of the browser.” Set bwidth to the narrow width you want to test and bheight to the height you want visible in the browser window. The separate width parameter sets the thumbnail’s output width; changing it does not, by itself, make the page render in a mobile layout. See the Thumbalizr API documentation.

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A chosen pixel width is an inspection target, not a universal definition of mobile. It also does not establish that Thumbalizr is emulating a particular phone, browser, or device profile: the documented controls establish browser viewport dimensions.

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Choose the capture area

  • size=screen captures the visible browser viewport configured with bwidth and bheight.
  • size=page captures the full page at the configured browser viewport. The free plan is listed as screen-only; full-page capture is listed for higher tiers.

For a responsive-layout check, start with size=screen if you need to inspect what fits in the initial viewport. Use size=page when you need content farther down the page as well.

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Check that your plan supports the viewport you need

Published Thumbalizr pages do not describe plan entitlements identically. Its demo summarizes Free and Silver as fixed at 1280×1024, while Gold and Platinum allow larger or custom browser dimensions. The feature page lists custom browser width and height ranges for Gold and Platinum. The API table also gives plan-specific ranges. Confirm the live plan page and the limits shown in your own account before relying on a custom mobile width; do not assume Free or Silver accepts arbitrary dimensions.

Plan Published details relevant to this task
Free Demo page lists a watermarked, screen-only capture fixed at 1280×1024; feature page lists 100 screenshots per month. Custom mobile viewport is not established.
Silver Demo page lists unwatermarked screen or full-page capture fixed at 1280×1024; feature page lists 2,000 screenshots per month. Custom mobile viewport is not established.
Gold Demo lists larger/custom dimensions; feature page lists browser width from 1–2000 and height from 1–1600, custom delay, and US or European browsers; 3,000 screenshots per month.
Platinum Demo lists larger/custom dimensions; feature page lists up to 2000×2000, custom delay, and US or European browsers; 5,000 or more screenshots per month.

These are the published descriptions on Thumbalizr’s demo page and feature page; dimensions and quota descriptions can differ by page. Prices are omitted because they can change. For the exact entitlement on a current account, use the plan page and account information.

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Build an Embed API request

  1. Obtain the Embed API key and secret from your Thumbalizr account.
  2. Set bwidth and bheight to the browser viewport dimensions supported by your plan.
  3. Set size to screen or page according to the capture area you need.
  4. URL-encode the target URL and parameter values, then construct the Embed API URL and token using the secret as documented by Thumbalizr.
  5. Read the response headers to determine whether the capture completed or failed.

The API documentation describes the Embed API URL and token process, but the available documentation here does not provide a single reusable request example that can safely be reproduced without the account-specific key, secret, and token-generation details. Follow the current API instructions rather than guessing a signing format.

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Read the response status and recover from failures

Thumbalizr documents X-Thumbalizr-Status values QUEUED, OK, and FAILED. The X-Thumbalizr-Error header supplies a failure reason.

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  • QUEUED: The request has not completed yet. Follow the API’s documented completion or polling behavior rather than treating it as a finished image.
  • FAILED: Read X-Thumbalizr-Error, then check the target URL, authentication/token construction, URL encoding, and plan-supported viewport values.
  • Unexpectedly desktop-looking result: Confirm that you set bwidth, not only width. Check that the plan permits the requested browser dimensions.
  • Only the initial viewport appears: Use size=page for a full-page capture, and verify that the plan includes it.
  • Watermark or fixed dimensions: Compare the account’s plan with Thumbalizr’s current plan descriptions; Free and Silver are described as fixed-size on the demo page.

Do not infer device-specific rendering from a successful narrow-width capture. It verifies a viewport-width result, not necessarily a particular handset’s user agent or hardware behavior.

Or skip the browser setup

ScreenshotNeo is an alternative website screenshot API: it accepts one GET request with a URL and can return a PNG, JPEG, WebP, or PDF. Its cookie and consent handling accepts banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be disabled. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, with the outcome reported in response headers. Its MCP server provides screenshot tools for AI agents.

Example cURL request (replace the target URL as needed):

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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

See the ScreenshotNeo API documentation for request options. ScreenshotNeo’s free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up free for ScreenshotNeo.

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FAQ

Does a narrow Thumbalizr screenshot prove how a specific phone displays the site?

No. The documented parameters set browser viewport dimensions; they do not establish a model-specific phone or browser emulation profile.

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Can I use any mobile width on Thumbalizr Free?

That is not established by the published plan descriptions. The demo lists Free as fixed at 1280×1024, so check your current account entitlement before attempting a custom width.

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.

Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.

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