Fix Claude.ai Not Loading: Blank Screen & Spinning Wheel

Diagnose Claude.ai Loading Issues

When Claude.ai fails to load, it typically presents as a completely blank white screen, a persistent spinning loading wheel, or a redirect loop that returns you to the login screen. Because Claude.ai relies heavily on client-side JavaScript rendering and secure WebSocket connections, these issues are usually caused by cached script conflicts, aggressive browser extensions, local network blocks, or localized CDN (Content Delivery Network) outages.

Before changing your settings, determine if the issue is universal or local. Check the official Anthropic status page or third-party monitoring services to confirm if a global outage is underway. If the status page reports all systems operational, the issue lies within your local browser configuration, network path, or DNS resolver.

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Step-by-Step Fixes for Claude Loading Failures

Follow these troubleshooting steps in order to isolate and resolve the loading failure.

1. Perform a Hard Refresh to Clear Cached Scripts Browsers store static assets (like Claude's JavaScript bundles) to speed up load times. If Anthropic deploys an update, your browser may attempt to run outdated cached scripts against the new backend, causing a silent crash that results in a blank white screen. * **Windows/Linux:** Press `Ctrl` + `F5` or `Ctrl` + `Shift` + `R`. * **Mac:** Press `Cmd` + `Shift` + `R` or hold `Shift` and click the reload button in Safari.

2. Clear IndexedDB and Site Storage for Claude.ai Claude.ai uses your browser's IndexedDB and LocalStorage to manage active sessions and UI state. If this data becomes corrupted, the app will fail to initialize. * In Google Chrome or Microsoft Edge, click the lock icon next to the URL in the address bar. * Select **Site settings** or **Cookies and site data**. * Click **Manage on-device site data** or **Clear data**. * Delete all stored data for `claude.ai` and restart your browser.

3. Identify and Disable Conflicting Browser Extensions Browser extensions—particularly ad blockers, script blockers (like NoScript), privacy shields, and translation tools—frequently block the WebSockets or API endpoints Claude requires. * Open an **Incognito** or **Private Browsing** window where extensions are disabled by default. * Navigate to `https://claude.ai` and try to log in. * If Claude loads correctly, return to your normal window, disable your extensions one by one (starting with ad/privacy blockers), and refresh the page to identify the culprit.

4. Bypass Local Network and DNS Blocks Some corporate firewalls, parental control software, or ISP DNS servers block the domain paths used by Claude.ai for safety or bandwidth preservation. * Temporarily switch your device from your local Wi-Fi to a mobile hotspot to bypass local network routers. * Change your device's DNS servers to a reliable public resolver, such as Google Public DNS (`8.8.8.8` and `8.8.4.4`) or Cloudflare DNS (`1.1.1.1`). * Flush your system's DNS cache. On Windows, open Command Prompt and type `ipconfig /flushdns`. On macOS, open Terminal and type `sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder`.

5. Disable VPNs and Proxy Servers Anthropic utilizes Cloudflare to mitigate DDoS attacks and scraping. Cloudflare regularly flags IP addresses assigned to commercial VPNs or proxy networks. If your VPN IP is flagged, your connection to Claude.ai may be silently dropped or trapped in an infinite Cloudflare CAPTCHA loop. Temporarily disable your VPN or switch to a different server location to restore access.

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Common Network Blocks to Check

If you are on a managed corporate network, ask your IT administrator to whitelist the following domains and wildcards, which are essential for the Claude.ai application to load and communicate with its backend LLM nodes: * *.claude.ai * *.anthropic.com * anthropic-user-uploads.s3.amazonaws.com (essential for viewing and downloading files/images)

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When to Escalate

If you have cleared your local storage, disabled all extensions, bypassed your local network via a mobile hotspot, and Claude.ai still presents a blank screen, the issue is likely a localized edge server outage within Cloudflare's network. In this scenario, check the Anthropic Status page and monitor official communication channels. If the status page reports green but your local diagnostic steps fail, contact Anthropic Support through their Help Center, providing your browser console logs (accessible by pressing F12 and selecting the 'Console' tab) to help them identify potential front-end bugs.