Bitwarden Send
bitwarden.com
Shares a password through a link that stops working after one view
Free tier
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onetimesecret.com
Puts a secret behind a link that destroys itself once it is opened.
Paste a password or a private message, get a URL, and the first person to open it sees the secret and burns it — anyone arriving afterwards gets nothing, which also tells you if the link was intercepted. You can add a passphrase and choose how long it survives unopened, and no account is needed for a one-off. It is built for short secrets, not files.
Questions
Works the moment the page loads. No account, no email, no trial. Text only and length-limited — there is no way to attach a file to a secret.
Yes. Onetime Secret sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Text only and length-limited — there is no way to attach a file to a secret.
Alternatives
Same category or same task, ordered by how closely they overlap.
bitwarden.com
Shares a password through a link that stops working after one view
file.io
Uploads a file and deletes it the moment someone downloads it
send.tresorit.com
A 5 GB end-to-end encrypted drop that needs no sign-up on either side
wormhole.app
Encrypts the file in your browser, then hands you a self-expiring link
pairdrop.net
Finds other browsers on your network and sends files straight to them
toffeeshare.com
Streams a file from your browser to theirs with no copy in between