Alternatives to Send
Self-hostable encrypted file sharing, continuing Firefox Send. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Send
Self-hostable encrypted file sharing, continuing Firefox Send.
Replacements
Listings that take over the same core job as Send.
OnionShare
Shares files, hosts sites and chats anonymously over Tor.
OnionShare shares files over Tor from your own desktop with no third-party server, but your machine must stay online and transfers are slow.
croc
Sends a file between any two computers with one command and a short code phrase, end-to-end encrypted.
croc sends files directly between computers with a code phrase and PAKE encryption, needing no hosted instance, but both sides must be online during the transfer.
PairDrop
Browser-based device-to-device file transfer with no install or signup.
PairDrop transfers files device to device in the browser without links that persist, requiring both devices to have the page open at the same time.
Smash
A web service and mobile app for sending large files of any size as a download link.
Smash is a hosted closed-source service with mobile apps, password protection and expiry, but stores files unencrypted by the browser on its servers.
Also worth comparing
These listings name Send as their own alternative, so the relationship runs both ways.
ffsend
A command-line client for sharing encrypted files through Send-compatible servers.
Send is the self-hostable web service that ffsend talks to, encrypting files in the browser instead of the terminal and expiring links by time or download count.
MASV
A hosted service for transferring very large files and media, used from the browser.
Send is open-source and self-hostable, encrypting files in the browser with expiring links, but public instances come and go and development is intermittent.
Similar software
Related functionality, not a direct replacement.