File Transfer Service
Definition
A file transfer service is built for a single hop: upload a file, receive a link, send the link, and the service removes the file when the clock runs out. WeTransfer, Smash and their competitors are the familiar examples, with free tiers around 2 GB and retention typically somewhere between three and thirty days. Nothing about the arrangement is meant to last — there is no address you own, no folder structure, often no account at all. Set it beside cloud storage, which keeps the file indefinitely inside your account, and beside hosting, which serves the file to anyone at an address that stays put. The choice between the three is really a question about time: minutes, years, or indefinitely.
Why It Matters
Expiry is both the feature and the trap. It is genuinely right when you are sending a print-ready file to a printer and would rather it did not linger anywhere, and it is a disaster when the link ends up in a contract, a handover pack or a course page. The address is random and disposable as well, so nobody can sensibly bookmark it, a QR code aimed at it dies with the file, and there is no way to correct the contents without issuing a new link. Use a transfer service for the one-off, and for anything a person might come back to, use an address you own.
How It Works
You upload over HTTPS and the service stores the file against a random identifier, usually a token long enough to be unguessable. It then emails or displays a link containing that token, and anyone holding the token can download, so the token is the access control. A background job deletes the object once the retention window passes, after which the link returns a 404 or an expiry page. Some services email the sender when a download happens, and that notification is the whole of their tracking. Because the token is the only secret, forwarding the email forwards the access, and there is no way to take it back short of deleting the file.
Real-World Example
A photographer sends 8 GB of raw shots to a retoucher through a transfer service — one hop, one person, gone in a week, exactly right. The finished gallery is a different job, so it goes on 99helpers at lakeside-shoot.99helpers.site with a password, and the client can return to it in March without asking for anything new. Same photographer, same week, two tools, because the two sets of files have different lifespans.
Common Mistakes
- ✕Using a transfer link as the delivery record for a paid job — when the client comes back three months later the file is gone and you look disorganised
- ✕Sending the link to a group address — the token travels with every forward, and revoking it means deleting the file for everyone
- ✕Assuming the free tier still keeps files for a month — several services have shortened their retention, and what applies is the policy on the day you upload
Related Terms
Cloud Storage
Cloud storage keeps your files on someone else's servers and syncs them to your devices. Holding files for you is a different job from publishing one to the web.
Large File Transfer
Large file transfer is the business of getting a file too big for email from one person to another. In practice it means uploading it once and sending an address.
Link Rot
Link rot is the slow decay of working links into dead ones as pages move, domains lapse and services shut down. A large share of links published a decade ago no longer resolve.
Expiring Link
A shareable address that stops serving its file after a set moment — a date, a number of days, or a number of downloads. The file stays stored; only the route to it closes.
File Hosting
File hosting is the service of keeping a file on a machine that is always online and giving it a web address, so anyone with that address can view or download it. The host owns the disk, the bandwidth and the certificate; you supply the file.
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