Collect documents from clients. Only you can open them.
Coffer is an end-to-end encrypted way to request, send and keep files. Send a link, and your client uploads from any browser with no account. Files are encrypted in their browser with AES-256-GCM before they leave it, so the server stores only ciphertext: it cannot read a file or its name.
Request files
Make an upload link, say what you need and by when, and set how many files it takes and when it closes. Your client opens it and drops their files in. The link can only upload: it cannot read, list or delete anything. For accountants collecting statements and IDs, lawyers collecting case documents, recruiters collecting CVs, landlords collecting applications, and teachers collecting coursework by a deadline.
Send files
Drop files or paste a note and get a link. Whoever opens it needs no account and installs nothing. Links can expire, burn after a number of views, carry a password, and be revoked.
Keep a drive
Encrypted folders and notes, and a list of every link you have shared. Start free with 300 MB; paid plans from 100 GB.
Open source
Coffer is free software under the AGPL and runs as a single container. Source on GitHub. Read the security model, the terms and the privacy policy.
Coffer needs JavaScript to encrypt and decrypt in your browser.