Tresorit Send
send.tresorit.com
A 5 GB end-to-end encrypted drop that needs no sign-up on either side
file.io
Uploads a file and deletes it the moment someone downloads it.
file.io is a temporary host with one hard rule: the file is destroyed after the first successful download, or when its expiry passes, whichever comes first. No account and no personal details, up to 4 GB, and an API simple enough to call from a shell script. The default life is 14 days, and one download genuinely means one.
Questions
Works the moment the page loads. No account, no email, no trial. The file is gone after the first download, so a recipient who fumbles the link cannot try again.
Yes. file.io 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.
The file is gone after the first download, so a recipient who fumbles the link cannot try again.
Alternatives
Same category or same task, ordered by how closely they overlap.
send.tresorit.com
A 5 GB end-to-end encrypted drop that needs no sign-up on either side
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
wormhole.app
Encrypts the file in your browser, then hands you a self-expiring link
send-anywhere.com
Pairs two devices with a six-digit key instead of sending a link
fromsmash.com
Sends a file of any size without charging you for the big ones