Why Your Screenshot API Returns Blank Pages

Updated March 2026 · 5 min read

You call a screenshot API, and instead of a beautiful page capture, you get a white rectangle. Or a Cloudflare challenge page. Or a cookie consent popup covering everything.

This is the most common complaint about screenshot APIs, and it almost always comes down to one of six causes.

1. Bot Detection is Blocking You

This is the #1 reason for blank or broken screenshots in 2026. Most screenshot APIs use headless Chromium, and modern bot detectors (Cloudflare, PerimeterX, DataDome, Akamai) can identify headless Chrome in milliseconds.

What happens:

• The target site sees a headless Chrome fingerprint
• It returns a CAPTCHA challenge, a blank page, or a "checking your browser" interstitial
• Your screenshot API captures that instead of the real page

How to fix it

JavaScript-level stealth patches (like puppeteer-extra-plugin-stealth) help with basic protections but fail against sophisticated detectors. The only reliable solution is an engine-level anti-detect browser.

Enable it by setting "stealth": true in your PixShot API call.

2. JavaScript Hasn't Finished Rendering

Many modern sites use React, Vue, or Angular — the HTML returned by the server is an empty shell that JavaScript fills in. If the screenshot is taken before JS finishes executing, you get a blank or half-rendered page.

How to fix it

• Wait for a selector: Use wait_for_selector to wait until a specific element appears (e.g., "wait_for_selector": ".main-content")
• Add a delay: Use wait_for_timeout for a fixed wait (e.g., "wait_for_timeout": 3000 for 3 seconds)
• Wait for network idle: Some APIs support waiting until there are no pending network requests

For SPAs, waiting for a selector is more reliable than a fixed timeout because rendering time varies.

3. Cookie Consent Popups

GDPR cookie banners can cover the entire viewport, especially on European sites. Your screenshot captures the popup instead of the page content.

How to fix it

• Use built-in blocking: Some APIs (ScreenshotOne, Urlbox) have cookie banner blocklists
• Inject custom CSS: Hide the banner with custom_css: "custom_css": ".cookie-banner, #consent-popup { display: none !important; }"
• Set cookies: Pre-set the consent cookie so the banner never shows

4. Viewport Is Too Small

Some sites detect small viewports and render a mobile layout, a "download our app" banner, or nothing at all. The default viewport in many APIs is 800x600, which triggers mobile breakpoints on responsive sites.

How to fix it

Set a desktop viewport: "viewport_width": 1280, "viewport_height": 720. For mobile screenshots, use device emulation instead of just shrinking the viewport.

5. The URL Is Behind Authentication

If the page requires login, the screenshot API sees a login page or redirect instead of the content.

How to fix it

• Set cookies: Pass session cookies via the API to authenticate the request
• Set headers: Use Authorization headers for API-protected pages
• Render from HTML: If you can fetch the page server-side, pass the raw HTML to the screenshot API instead of the URL

6. The Site Blocks Your API's IP Range

Some sites block known cloud/datacenter IP ranges. Screenshot APIs run on cloud servers, and their IPs may be on blocklists.

How to fix it

• Use a proxy: Route the request through a residential proxy. In PixShot, set "use_proxy": true for server-managed proxy, or provide your own with the "proxy" parameter.
• Combine with anti-detect: A residential proxy plus anti-detect browser is the most reliable combination for difficult targets.

Still Getting Blank Pages?

If you've tried the above and still get blank results, the issue might be:

• The site uses WebGL or canvas-based rendering that headless browsers handle differently
• A WAF (Web Application Firewall) is blocking based on geographic location
• The page requires user interaction (scrolling, clicking) before content loads

For these edge cases, PixShot's Camoufox stealth mode plus proxy support handles the majority of difficult targets.