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WhatsApp Web: hide last-seen text

Hides the last-seen and online status text in the header of the open conversation.

Code to copy

/* Hide "last seen / online" presence text in chats and headers */
[data-testid="conversation-info-header-chat-subtitle"],
header[data-testid="conversation-header"] span[title*="last seen" i],
header[data-testid="conversation-header"] span[title*="online" i],
header[data-testid="conversation-header"] span:where([class*="subtitle"]) {
  visibility: hidden !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.