Sending files to clients, the worry isn't just whether they go through: a link forwarded carelessly can leak your draft; files get compressed and re-encoded inside chat apps, so what the client receives isn't what you sent; and after sending, you can't confirm who picked the file up or how many times — hard to account for when something goes wrong. Business contracts, audit data, design source files, client records — the more important the file, the more you need a controllable delivery method, not a "send it and hope" approach.
WringCloud delivery links come with four layers of protection built in: extraction password, automatic expiry, download count limit, and SHA256 tamper-proof verification. The transfer path matters just as much: when both parties are online, P2P direct transfer uses WebRTC DTLS end-to-end encryption, so the file never passes through a server; across networks it travels over a full-chain HTTPS encrypted secure relay, billed by download traffic (traffic pack from ¥1 = 2 GB). Every open and download leaves a receipt trail — who, when, and what was taken, all crystal clear.
Secure Delivery in Three Steps
Set Up Your Defenses at Upload
Drop the file into WringCloud and set an extraction password, an expiry date, and a download count limit — recipients must verify the password to receive it. When both parties are online, P2P end-to-end encrypted direct transfer keeps the file off the cloud; when offline, it goes through a full-chain HTTPS encrypted relay, billed by download traffic (from ¥1 = 2 GB).
Send the Link and Password Separately
Send the link and the password in two separate messages, so the file lands only in the hands it was meant for. SHA256 verification guarantees the file your client receives is exactly what you uploaded — any tampering in between shows up the moment you check.
Receipts with a Full Audit Trail
Every open and download is logged with a receipt and a clear timestamp, ready to serve directly as a delivery record; links expire automatically, and files can be deleted manually when needed — nothing left hanging.
Security isn't a single point — it's an entire chain: transfer encryption covers safety "on the road"; password, expiry, and download limits guard the "doorway"; SHA256 ensures content integrity; and receipts provide "afterward" traceability. With all four layers together, delivery is truly under control — that's what separates large-file delivery from casually tossing a file across.
Frequently Asked Questions
Can files be intercepted or tampered with during transfer?
P2P direct transfer uses WebRTC DTLS end-to-end encryption, so the file never passes through a server; across networks, it travels over full-chain HTTPS encryption. SHA256 verification confirms the file is identical to what was uploaded — a tampered file cannot pass the check.
What if the link gets forwarded to someone else?
Three more safeguards stand behind it: extraction password, download count limit, and expiry. As long as the password doesn't leak, a forwarded link can't fetch the file; once the count runs out or the link expires, it deactivates automatically.
How do I prove to my client that delivery is complete?
Every open and download leaves a receipt trail with clear timestamps that can serve directly as a delivery record — solid evidence for acceptance and reconciliation.
Can I retract files after delivery is complete?
Links support an expiry date and a download count limit, deactivating automatically when time is up; files can also be deleted manually. For long-term archiving of critical material, use your own backup system — the WringCloud Library (from 50GB on the Personal plan) is best for staging and circulating deliverables.
Important files deserve a delivery chain you control. Head back to the WringCloud homepage and drop in a file to try it; if you have questions about the security details, browse the FAQ first.