Upload Services vs Direct Transfers: Which Is Right for You?

There are basically two ways to send someone a big file over the internet:

1. Upload it somewhere, and give them a link to download it later. WeTransfer, Smash, Filemail, Google Drive and Dropbox links all work like this.
2. Send it directly from your device to theirs while you’re both online. BoltShare, ToffeeShare, PairDrop and similar tools work like this.

We make a direct transfer tool, so you’d expect us to say direct is always better. It isn’t. Each approach is genuinely better at different things.

How upload services work

You upload the file to the service’s servers. They store it, usually for a few days to a few weeks, and send the recipient a link. The recipient downloads it whenever they like.

Where it shines:

• The recipient isn’t around right now. You can send at 11pm and close your laptop. They’ll download it in the morning.
• Several people need the same file. Upload once, and everyone downloads from the server at their own pace.
• You need a paper trail. Many services email you when the file’s been downloaded, which is handy for client work.

The catches:

• You wait twice. The full upload has to finish before anyone can start downloading. On a typical home connection, where upload is much slower than download, that can be hours for big files.
• Size caps and expiry. Free tiers usually cap transfer size, and files expire. Larger limits typically mean a subscription.
• Your file sits on someone else’s server. Usually encrypted at rest, and deleted after the expiry date. But it’s there, and for some work (legal, medical, unreleased material) that matters.

How direct transfers work

Your browser connects to the recipient’s browser and the file streams across while you’re both online. Nothing is stored in between. If you’re curious about the mechanics, this explainer on WebRTC walks through it.

Where it shines:

• No upload wait. The recipient starts receiving the moment you start sending, so a transfer takes roughly half the time of upload-then-download.
• No size cap. There’s no storage bill driving limits. Sending 100 GB costs the service about the same as sending 1 GB (unless it’s relayed, which we’ll come to).
• Nothing left behind. No copy on a server, no expiry date to think about, no forgotten files in someone’s cloud.
• Same-network speed. Two devices in the same building can transfer over the local network, which can be far faster than any internet connection.

The catches:

• Both of you need to be online at the same time. This is the big one. If the recipient is in a different time zone and won’t open the link for eight hours, a direct transfer means leaving your computer on for eight hours.
• The sender must keep the tab open. Close it, or let the laptop sleep, and the transfer stops. Good tools resume when you come back. BoltShare does, but it can’t send from a closed tab.
• Some networks block direct connections. Strict office firewalls are the usual culprit. Tools work around this with relays. BoltShare’s Bolt Tunnel mode does this, but then the data does pass through a server (in transit, not stored).

A simple way to decide

Ask yourself one question: will the recipient download it within the next few minutes?

• Yes, they’re on the phone with you, sitting next to you, or waiting for it → direct transfer. It’ll be faster and nothing gets stored.
• No, they’ll get to it later, or lots of people need it → an upload service is the better tool.

A few more specific cases:

Situation	Better choice
Moving files between your own two devices	Direct
Sending raw footage to an editor who’s waiting for it	Direct
Sending files to a client in another time zone	Upload service
One file going to 20 people	Upload service
Sensitive files you don’t want stored anywhere	Direct (P2P mode)
Very large files (50 GB+) on a free plan	Direct
Office network that blocks everything	Either, via a relay

Using both

Plenty of people use both kinds of tool, and that’s sensible. Keep a direct tool for the “I need to get this to you right now” moments, and a cloud folder for the “here’s the project, grab it when you can” ones. Neither one is the best choice for every transfer.