Safenote is the free, fast, and secure way to share files and notes with end-to-end encryption and a link that expires automatically. And also it's...
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You have to completely trust the website owner.
Even if the webpage encrypts the secret using WebCrypto before submitting to server, you still have to completely trust the website owner, because they could change the JavaScript later and reveal the secret.
This does not seem to have end to end encryption. For example, when saving a note with the content "test".

Thank you! We are looking forward for your feedback!