What is SPA pre-rendering and why do I need it?
Single Page Applications (SPAs) built with React, Vue.js, Angular, or Svelte render content dynamically using JavaScript. Search engines like Google and Bing have limited ability to execute JavaScript during crawling, which can result in your pages being partially or completely invisible in search results. Pre-rendering generates static HTML snapshots of your pages and serves them specifically to search engine crawlers, while human visitors continue to use your original SPA. This ensures your content, meta tags, and structured data are fully indexed — improving your organic ranking, visibility, and click-through rates without requiring any code changes to your application.
How is pre-rendering different from Server-Side Rendering (SSR)?
SSR requires rebuilding your application with frameworks like Next.js or Nuxt.js, handling hydration, and managing server-side compatibility issues. Pre-rendering is non-invasive: your existing SPA stays untouched, and a service like prerendered.io intercepts crawler requests, renders your pages in a headless browser, and serves the resulting HTML to bots. Humans still get your original SPA. Zero code changes, no framework migration, and deployment takes minutes — not weeks.
Which search engines and AI crawlers are supported?
prerendered.io supports 100+ crawlers including Google (Googlebot), Bing (Bingbot), Yandex, Baidu, DuckDuckGo, Apple, and regional engines like Naver, Seznam, Qwant, and Ecosia. AI crawlers are fully supported: GPTBot (ChatGPT), ClaudeBot (Anthropic Claude), PerplexityBot, DeepSeekBot, Google-Extended (Gemini), ByteSpider (TikTok), and AmazonBot. Social media bots — Facebook, Twitter/X, LinkedIn, WhatsApp, Telegram, Discord, Slack, Pinterest — receive pre-rendered HTML for rich link previews.
What is 5-layer bot detection?
Unlike basic services that only check user-agent headers, prerendered.io uses five detection layers: (1) Verified crawler IP ranges with reverse DNS for Google, Bing, and Apple. (2) ISP detection — cloud provider traffic (AWS, Azure, Google Cloud, Hetzner) with browser user-agents is flagged as bot traffic. (3) Rate limiting — more than 15 requests per minute from one IP triggers detection. (4) Behavioral scoring — missing cookies, no JavaScript execution, and suspicious headers are analyzed. (5) Probe blocking — vulnerability scans targeting .env, wp-admin, etc. are blocked. This prevents stealth scrapers from bypassing detection by changing their user-agent.
Why choose an EU-hosted pre-rendering service?
prerendered.io is hosted entirely in the EU (Germany), ensuring compliance with GDPR and EU data protection regulations. No transatlantic data transfers means no Schrems II concerns. We provide proper German invoicing with USt-IdNr. (VAT ID), making accounting straightforward for European businesses. Many competitors are US-hosted, creating legal complexity for EU companies.
What is soft 404 detection?
A soft 404 occurs when a page returns HTTP 200 but displays “not found” content — common in SPAs where the router catches all URLs. Search engines penalize sites with many soft 404s because they waste crawl budget and indicate poor quality. prerendered.io detects soft 404s by analyzing rendered HTML and returns proper 404 status codes to crawlers, protecting your SEO health.
How does cookie and consent banner removal work?
prerendered.io automatically detects and removes 50+ cookie consent banner patterns, GDPR popups, ad overlays, chat widgets, push notification prompts, and newsletter modals from the rendered HTML served to crawlers. This means Google, Bing, and AI crawlers never index your cookie wall or see “Accept Cookies” as your page content. The removal happens during rendering — your visitors still see the consent banner as required by law, but bots get clean, content-focused HTML.
What does the SEO scoring feature check?
Every page rendered by prerendered.io receives an SEO score from 0 to 100. The score checks for: page title, meta description, h1 heading, canonical link, og:title, og:description, og:image for social sharing, JSON-LD structured data, html lang attribute, and viewport meta tag. Scores are visible per page in your dashboard, making it easy to spot pages with missing meta tags or broken structured data before search engines do.
Do you support social media link previews?
Yes. When someone shares a link to your SPA on Facebook, Twitter/X, LinkedIn, WhatsApp, Telegram, Discord, Slack, or Pinterest, the platform's bot crawls your page to generate a preview card. Since SPAs render client-side, these bots typically see an empty page — resulting in blank or broken previews. prerendered.io serves fully rendered HTML with proper Open Graph and meta tags to all social media crawlers, ensuring every shared link shows a rich preview with title, description, and image.