What Is WeTransfer and How Do You Send Large Files Online?
WeTransfer is a file-transfer service built for one job: getting a file too large for email attachments from your computer to someone else's, without asking either side to set up shared cloud storage. You upload a file, enter the recipient's email address, and WeTransfer sends them a download link. The recipient clicks the link, downloads the file, and the transfer expires after a set period. That is the whole model — no folder syncing, no account required for a basic send.
This article covers how that flow works, what the free tier actually allows, how WeTransfer compares to alternatives like SendBig, Dropbox, and Google Drive, and what to do when a transfer fails or expires.
How the WeTransfer send flow works
The core interaction is deliberately short:
- Add files. Open the WeTransfer site and add your files through the upload area (drag-and-drop or a file picker).
- Enter the recipient's email and your own. WeTransfer uses your email to confirm the transfer was sent and to notify you when the recipient downloads it.
- Optionally add a message. A short note travels with the transfer email.
- Send. WeTransfer uploads the files to its servers and emails the recipient a download link.
- Recipient downloads. The link stays live until the expiry window closes, after which the files are removed.
The key point is that the file does not travel as an email attachment. The email only carries a link; the bytes sit on WeTransfer's servers until the recipient pulls them down or the transfer expires.
Free plan limits and what they mean in practice
WeTransfer's free tier is designed for occasional, one-off sends rather than ongoing file exchange. The limits that matter most:
| Limit | What it means for you |
|---|---|
| File size cap | Free transfers have a maximum total size per send. If your files exceed it, you must split the send or move to a paid plan. |
| Link expiry | Free transfer links expire after a fixed period. If the recipient is slow to download, the link dies and you have to resend. |
| No resumable upload | If your connection drops mid-upload on the free tier, you generally start over rather than continuing where you stopped. |
| No password protection on free sends | Anyone with the link can download. Password-protected transfers are a paid feature. |
The expiry limit is the one that catches people most often. A transfer sent on a Friday to someone who checks email on Monday may already be gone. If timing is uncertain, tell the recipient to expect the link and download it promptly, or use a service with a longer or configurable expiry window.
How WeTransfer compares to SendBig, Dropbox, and Google Drive
These tools solve overlapping but different problems. The right choice depends on whether you want a one-off link, a persistent shared folder, or a resumable large upload.
| Service | Model | Best for | Trade-off |
|---|---|---|---|
| WeTransfer | One-off transfer link | Quick sends to someone who just needs the file | Free links expire; no persistent storage |
| SendBig | One-off transfer link, up to 30GB free per its site | Very large single sends, including video | Free-tier features and expiry terms should be checked on the site before relying on them |
| Dropbox | Cloud storage with share links | Files you'll reuse, edit, or share repeatedly | Requires an account; free storage is limited |
| Google Drive | Cloud storage with share links | Files tied to a Google account, collaborative docs | Requires a Google account; sharing permissions add a step |
A practical rule: if the file is a one-time delivery and the recipient has no reason to keep it, a transfer service like WeTransfer or SendBig is the lighter option. If the file is something you'll send again, update, or want the recipient to browse, cloud storage with a share link is the better fit.
SendBig's own site positions resumable uploads as its differentiator: per its FAQ, logged-in users can start an upload, shut down their computer, and resume the same upload the next day, with incomplete uploads retrieved and displayed when they log back in. That matters if you're pushing a multi-gigabyte video over an unreliable connection — a scenario where a non-resumable free upload can fail repeatedly.
Security and privacy basics
For any transfer service, the questions worth asking are: is the file encrypted in transit and at rest, who can access it, and when is it deleted?
SendBig's site states that files are encrypted in transit and at rest using AES-256, that SSL/TLS protects data transfer, that its servers are ISO 27001 certified, and that files are automatically deleted once a transfer expires. It also notes that password protection and expiry/download-count limits can add further control. These are the claims of the service itself; treat them as the vendor's stated practices rather than independently verified facts.
For WeTransfer, check the current security and retention terms on its own site before sending anything sensitive, since free-tier behavior can change. Regardless of service, the general precautions hold:
- Don't send credentials, financial documents, or personal data through a link that anyone who intercepts it can open.
- Use password protection when the service offers it and the content warrants it.
- Set the shortest expiry that still gives the recipient time to download.
- Confirm the recipient's email address before sending — a mistyped address sends your file to a stranger.
Troubleshooting failed or expired transfers
Most transfer problems fall into a few recognizable categories:
The upload stalls or fails partway. On a non-resumable free tier, a dropped connection usually means restarting. If this happens repeatedly with large files, switch to a service with resumable uploads (SendBig advertises this for logged-in users) or upload from a more stable connection.
The recipient says the link is dead. The transfer expired. Resend it, and this time tell the recipient when to expect it. If the recipient is in a different time zone, account for that in your timing.
The recipient can't download. Check that the link wasn't truncated when copied, that the recipient isn't behind a network that blocks the service, and that the transfer hasn't hit a download-count limit.
The file is too big for the free tier. Either split the send into multiple transfers, compress the files, or use a service with a higher free cap — SendBig's site advertises up to 30GB free, which is worth comparing against your actual file size.
You need the file to stay available longer. Free transfer links are temporary by design. If the recipient needs ongoing access, move the file to cloud storage and share a folder link instead.
Choosing between a transfer service and cloud storage
The decision comes down to one question: is this a delivery or a workspace?
- Delivery — a one-time handoff of a file the recipient will download and keep. Use WeTransfer, SendBig, or a similar transfer service. You avoid accounts on both sides and the link cleans itself up.
- Workspace — a file or folder that will be revisited, edited, or shared with multiple people over time. Use Dropbox, Google Drive, or another cloud storage service with persistent share links and permission controls.
If you regularly send large files and keep hitting expiry or size limits, that's the signal to either move to a paid transfer plan or shift the workflow to cloud storage. If you send large files only occasionally, the free transfer model is usually enough — just warn the recipient that the link is time-limited.