There is no single best way to send large files — there is a best way for each size and each situation. A 40 MB contract, a 6 GB video and a 300 GB photo archive need different tools. This guide compares every practical method of large file transfer — email, cloud drives, transfer services, messengers, direct peer-to-peer and physical drives — with real limits and real transfer times, so you can pick in a minute.
What counts as a "large file"?
"Large" is whatever is too big for the channel you would normally use. In practice there are four thresholds:
- Over ~20–25 MB — too big for an email attachment. A scanned PDF, a few RAW photos or a one-minute 4K clip already cross it.
- Over ~2–3 GB — too big for most free transfer services and for messenger apps. A feature length video or a design project with assets lands here.
- Over ~15 GB — more than a free cloud drive can hold. Full video shoots, game builds, disk images, CAD archives.
- Over ~100 GB — upload time becomes the real problem, not the limit. Here you either send directly or ship a drive. See how to send a 100 GB file for free.
What are the ways to send large files?
All figures are for free plans, as of 5 November 2026, from each vendor's own help pages. Plans change — check the vendor's current page before relying on a number.
| Method | Free size limit | Upload first? | Copy stored on a server? | Sender online during download? | Best for |
|---|---|---|---|---|---|
| Email (Gmail / iCloud Mail) | 25 MB / 20 MB per message | Yes | Yes, in mailboxes | No | Small documents |
| iCloud Mail Drop | 5 GB, link lasts 30 days | Yes | Yes | No | Apple users, a few GB |
| WeTransfer (free) | 3 GB per transfer, 10 transfers or 3 GB per 30 days | Yes | Yes, 3 days | No | Quick one-off sends |
| Dropbox Transfer (Basic) | 2 GB, expires after 7 days | Yes | Yes | No | Dropbox users |
| SwissTransfer | 50 GB, up to 30 days | Yes | Yes | No | Large sends without staying online |
| Google Drive | 15 GB account storage | Yes | Yes, until deleted | No | Shared folders, long-term access |
| WhatsApp / Telegram | 2 GB per document (Telegram Premium 4 GB) | Yes | Yes | No | Phone-to-phone |
| StrongFolder (P2P) | None set by the service | No | No | Yes | Huge files and folders, privacy |
| USB drive / external disk | Size of the drive | No | No | — | Terabytes, very slow internet |
Email: fine for documents, not for large files
Email is still the easiest way to send a large file if it is not that large. Gmail allows 25 MB per message and replaces anything bigger with a Google Drive link; iCloud Mail allows 20 MB, or up to 5 GB with Mail Drop. Details and workarounds for every provider are in email attachment size limits.
Cloud drives: best when people need access for weeks
Google Drive, OneDrive, Dropbox and iCloud Drive store the file and give you a link. The recipient can preview it, come back next week and download it any time — you don't need to stay online. The costs: you wait for the full upload first, the file uses your quota (Google gives 15 GB free shared with Gmail and Photos, Microsoft and Apple 5 GB, Dropbox Basic 2 GB), and a copy stays on the provider's servers until you delete it. Folders downloaded from the web are usually handed over as ZIP files. More in StrongFolder vs Google Drive.
Transfer services: easy, but capped and temporary
WeTransfer, Dropbox Transfer, SwissTransfer and similar services upload your file and e-mail a download link. Some free tiers work without an account; Dropbox Transfer needs a Dropbox account. Free limits range from 2 GB (Dropbox Transfer Basic) and 3 GB (WeTransfer) to 50 GB (SwissTransfer), and the files are deleted after a few days. A full comparison is in WeTransfer alternatives.
Messengers: convenient, but capped at about 2 GB
WhatsApp accepts documents up to 2 GB; Telegram accepts files up to 2 GB, or 4 GB with Premium. Photos and videos sent as regular media are usually compressed — send them as documents/files when quality matters.
Direct peer-to-peer transfer: no upload, no cap
A P2P tool connects the two browsers and streams the file straight from your disk to the recipient's. Nothing waits in a cloud, so the download starts immediately and there is nothing to delete afterwards. The catch is honest and simple: the file comes from your device, so your tab must stay open until the recipient finishes. How this works is explained in P2P file transfer.
Physical drive: still unbeatable for terabytes
If you have several terabytes or a very slow upload, copying to an external SSD and handing it over (or couriering it) is faster than any network. It is not an option for a client abroad who needs the file today.
How do I send a large file with StrongFolder?
The steps above take under a minute. Choose a file, several files or a whole folder, copy the link and send it. When the recipient opens the link, the transfer starts at once over an encrypted WebRTC connection — WebRTC encrypts every data channel with DTLS, so the file stream is encrypted in transit on every connection.
Files are never uploaded to or stored on a StrongFolder server. To create the link, the service keeps transfer metadata: file and folder names, sizes and the number of files. Folders arrive as folders — see send a folder without zipping.
Free · in your browser · no sign-up
How long does it take to transfer large files?
Every method is limited by the sender's upload speed, which is usually much lower than the download speed your provider advertises. The math: size in GB × 8,000 ÷ speed in Mbit/s = seconds.
| Upload speed | 1 GB | 10 GB | 100 GB |
|---|---|---|---|
| 10 Mbit/s | ~13 min | ~2.2 h | ~22 h |
| 50 Mbit/s | ~2.7 min | ~27 min | ~4.4 h |
| 100 Mbit/s | ~1.3 min | ~13 min | ~2.2 h |
| 500 Mbit/s | ~16 s | ~2.7 min | ~27 min |
Add 5–15 % for protocol overhead. With a cloud service you pay this time twice in sequence — your upload, then the recipient's download. With P2P the upload and the download happen at the same time, limited by the slower of the two connections.
Which method should I choose?
- Under 25 MB: just attach it.
- Up to 2–3 GB, and you want to send and walk away: a free transfer service or Mail Drop.
- Up to tens of GB, and recipients need access for weeks: a cloud drive with enough quota.
- Any size, a whole folder, or you don't want a stored copy: a direct P2P link.
- Several terabytes, or upload under 10 Mbit/s: an external drive.
When is StrongFolder not the best choice?
- You can't stay online. If you need to send the link and shut the laptop, use a cloud drive or a transfer service — files must be stored somewhere for that.
- The recipient will download days later. The link works while the sender keeps sharing. When the sender clicks Stop Sharing or closes the tab, the files are no longer available.
- People need to browse, preview or comment on files over weeks — a shared cloud folder does that better.
- Your upload is very slow and the files are huge. No network method beats a drive in the post.
Is it safe to share large files online?
Every method on this page encrypts the connection in transit. The difference is what happens afterwards: with email, cloud drives and transfer services a copy sits on a provider's servers until it is deleted or expires. With a direct transfer the file is never stored on a server. If a direct connection is impossible (strict corporate firewall, some mobile networks), the encrypted stream passes through a StrongFolder relay (TURN) server. The relay forwards the data and does not store it. More in secure file sharing.
Summary
To send large files, use email for anything under 25 MB, a transfer service or cloud drive when you can't stay online, and a direct peer-to-peer link for very large files, whole folders, or when you don't want a copy left on someone else's server. Next: how to send large video files, transfer files without uploading and P2P vs cloud file transfer.