Missing Claude conversations are usually not deleted. Search is the first place to look, because the sidebar only shows recent chats and an older one can simply be out of view. After that, check whether you are signed into the right account, which catches more cases than people expect. If chats went missing right after an outage, they often return once things settle.
You go looking for a conversation and it is not there. Sometimes several are not there. Sometimes the sidebar looks like it has been emptied.
Before assuming the worst: conversations live on Anthropic’s servers rather than in your browser, so nothing local can have removed them. Clearing your cache did not do it. Neither did signing out.
Which leaves a short list of things that actually cause this, in the order worth checking.
Which one are you seeing?
One specific chat I know I had is missing
Search for a phrase from it. The sidebar only shows recent conversations. Fix 1.
Everything is gone, the sidebar looks empty
Almost always the wrong account. Fix 2.
They vanished right after an outage or an update
Often temporary. Fix 4.
Fix 1: search, do not scroll
The sidebar is a recent list, not a full history. A chat from two months ago is not missing, it is below the fold of something that does not scroll back that far in a useful way.
Search for a distinctive phrase you know was in it rather than the topic. Search matches what was written, so an exact phrase you remember typing finds it faster than a description of what it was about.
Fix 2: check which account you are signed into
This is the most common cause of an apparently empty history and the easiest to dismiss.
If you have both a personal account and a work one, or signed up once with Google and once with an email address, those are separate accounts with separate histories. Same email address is not the same thing as the same login method.
Check the account shown in the lower left. Sign out and back in with the other method if you have any doubt. An empty history plus a working account is almost always this.
Fix 3: check for archived chats
Archiving hides a conversation from your main list without deleting it. It is easy to do accidentally.
Look for the archived section in your chat list or settings and check whether what you want is sitting there. If it is, you can restore it.
Fix 4: after an outage or an update
If chats disappeared at the same moment as something visibly went wrong, wait before doing anything.
History is loaded from Anthropic’s servers each time, and during an incident that load can fail or come back partial, which looks exactly like deletion. It usually resolves on its own. Check status.claude.com, and check again in an hour rather than trying to fix it.
Fix 5: export your data
Anthropic provides a data export, which is both a way to check what actually exists on your account and the only real backup.
It is in your account settings. Request the export, wait for it to arrive by email, and you get your conversation history as files. If a conversation you thought was gone is in there, it exists. If it is not, it has genuinely been deleted.
Worth doing once now rather than the day you need it.
Claude Code transcripts
Claude Code is a separate program from claude.ai and keeps its session records locally on your machine rather than in your account, so nothing in your web history applies to it and nothing above will recover them.
It has its own settings for how long those records are kept and whether they are cleaned up automatically. If terminal session history matters to you, find that setting and set it deliberately rather than discovering the default after you needed something. Check the current Claude Code documentation for where it lives and what it is set to, since it is configurable and has changed.
If a chat really is deleted
Deleted conversations are not recoverable. There is no undo, no bin, and no tool that can retrieve them, whatever the results promise you.
The honest answer is that the data export is the only protection, and it only helps if you did it beforehand. Which is the argument for doing it now.
How to avoid it next time
Run the data export once a quarter. It takes two minutes of your attention and solves this problem permanently.
For work you cannot lose, copy the output somewhere it belongs the day you produce it. A conversation is a workspace, not a filing system.
And use Projects for anything ongoing. Chats inside a project stay grouped together, which makes them far harder to lose track of than a loose conversation in a long list.
Written by the team at Lead Source, who work on lead attribution and have looked for a conversation in the wrong account more than once.