Send 4K Video Without Losing Quality

A 4K frame has four times the pixels of 1080p, and modern cameras and phones record it at high bitrates. That means even short clips can run to several gigabytes. Email attachments top out long before that, and many messaging apps either refuse the file or compress it down to a lower resolution.

If you are delivering footage to an editor, a client or a colour grader, compression defeats the point of shooting in 4K. You need a way to move the original file untouched.

File size depends on codec, bitrate and frame rate, so treat these as rough guides rather than exact figures:

Check the file size in your file manager before you upload. If a project is larger than 20 GB, split it across more than one transfer, for example one transfer per scene or per camera card.

1. Go to the homepage in any modern browser.
2. Drag in your clips, or a whole folder of footage. You can add up to 1000 files per transfer, totalling up to 20 GB.
3. Choose Link to copy a download URL, or Email to send it to your collaborators directly (you will confirm your email with a 6-digit code).
4. Optionally set a password so only people you tell can download.
5. Keep the tab open until the upload completes, then share the link.

We do not transcode, compress or resize anything. The recipient downloads exactly what you uploaded, whether that is an HEVC clip from a phone, a ProRes master, a MKV export or a folder of RAW stills. Metadata and timecode inside the file stay as they are, because the file itself is not changed.

Note that we do not offer in-browser video playback or previews. Recipients download the file and open it in their own player or editing software.

• Use a wired or strong Wi-Fi connection. Uploads are sent in chunks, and short drops are retried automatically while the tab stays open, but closing or reloading the tab stops the upload.
• Group related files. Sending a folder keeps the structure your editor expects.
• Manage delivery. On the Transfers page you can see download counts, resend emails, extend the 1 day expiry, or delete the transfer when the job is done.

Sending from a phone? See our iPhone guide. Comparing services? Read about our free WeTransfer alternative.

If you deliver 4K work to clients regularly, a consistent routine saves time and avoids confusion:

1. Name files clearly before uploading, for example with the project name, version and resolution, so the client knows exactly what they are downloading.
2. Send by email so the client gets a message with the download link, and add a short note explaining which file is the master and which is a smaller review copy, if you include one.
3. Add a password for unreleased work and share it through a different channel.
4. Check the download count on the Transfers page to confirm the client has the files, then delete the transfer or let it expire after 1 day.

Because the client needs only a browser, there is no software to explain and no account to create. The files they receive are identical to the ones on your drive, so there is no risk of a platform quietly lowering the resolution or bitrate on the way. If a client says the email never arrived, resend it from the Transfers page or copy the link and send it yourself.

For everyday video that is not 4K, the general guide to sending large video files covers the basics.