If Claude won’t open, you can’t send messages, or you suddenly get disconnected, don’t rush to keep refreshing. Follow the steps below in the order of “most common—easiest to fix” to troubleshoot Claude errors. From login verification to conversation interruptions, narrow the problem down step by step to your network, browser, or account itself.
Start with two quick checks: network and browser environment
Before beginning Claude troubleshooting, switch to a different network (toggle between Wi‑Fi and a mobile hotspot) to confirm whether the connection is unstable. Then open Claude in an incognito window and temporarily disable extensions such as ad blockers and script managers—many “blank page/buttons not clickable” issues are caused by extension conflicts. If it works in incognito mode, the problem is likely with cache or extensions; just follow the next section to fix it.
Login issues and verification failures: email, verification codes, and session expiration
If Claude gets stuck on login or keeps redirecting back to the login page, first clear site cookies and cache, then log in again—this is one of the most effective Claude troubleshooting methods. If you can’t receive the verification code, check the spam/junk folder or your corporate email security gateway, and try again after switching to a familiar network environment. If you see “session expired” or “verification failed,” logging out on all devices and signing in again often restores normal access.
Message send failures and conversation interruptions: checking input content and page state
When Claude shows “send failed” or keeps spinning, first copy your draft locally to avoid losing content, then refresh the page and re-enter the conversation to troubleshoot. Very long input or pasting large amounts of text or code blocks at once can easily cause frontend lag; send in smaller chunks and reduce the number of images and tables pasted in one go. If only one conversation is abnormal, creating a new chat to test can quickly tell whether that session is corrupted or it’s a global issue.
Upload and paste failures: file size, format, and permission restrictions
If file uploads error out, first confirm the file isn’t being used by another program, and rename the file using English letters and numbers to avoid parsing failures caused by special characters—this is a common troubleshooting detail. If an image or PDF is too large, compress it before uploading, and prioritize common formats (PNG/JPG/PDF). If a company computer has data-loss-prevention policies or browser upload/download controls, switching to a personal device or a different browser often verifies the cause immediately.
Rate limits and account risk controls: pausing, slowing down, and preparing information
High-frequency sending in a short period, repeated refreshing, or consecutive uploads of large files may trigger limits, showing as requests being rejected or temporary unavailability. The most reliable troubleshooting approach then is to stop for a while and try again later, while reducing your sending frequency. If you suspect an account issue, record the time it happened, the network used, the browser version, and screenshots of the error page—this can greatly reduce back-and-forth when contacting official support. If the problem persists, cross-check using another device and network to quickly determine whether it’s an environment issue or an account-side restriction.
