Is it safe to upload your WhatsApp chat?
It comes down to a single thing: whether the file leaves your device or not. That is the question to ask any tool before handing it a private conversation.
The real problem
An exported chat has everything: names, phone numbers, addresses, what you said to each other over years. If you upload it to a server, that information sits on a computer you don't control, subject to that company's policies and to whatever happens to that company in the future.
Most online analysers work like that: you get the file, you send it, they process it and hand you back the result.
The alternative: processing in the browser
A website can read a file without sending it anywhere. The browser opens it locally, does the maths on your own device, and shows the result. The file never travels.
That is how this tool works. There is no server receiving your chat because there is nothing to send.
How to check it yourself
You don't have to trust what a website says. It can be verified:
The airplane-mode test
Load this page, disconnect from the internet, and upload the file. If it still works, it is because nothing is being sent. With a tool that processes on a server, this fails.
Watching the network traffic
Open the browser's developer tools (F12), go to the "Network" tab, and upload the file. You will see that no request goes out with the content.
What to look for in any tool before uploading a chat
- Does it say explicitly where the file is processed?
- Does it ask you to create an account? If there is no server, no account is needed.
- Does it have a privacy policy, and does it say how long it keeps the data?
- Does it work offline once the page has loaded?
What this tool does
- The file is read in your browser and is never sent to any server.
- There is no sign-up and there are no accounts.
- Nothing is stored: when you close the tab, everything disappears.
- It works offline once the page has loaded.