Guide

What is the GMX attachment limit?

20 MB on GMX FreeMail, 50 MB on ProMail, 100 MB on TopMail, according to GMX’s help. Beyond that, send a link: up to 5 GB here, without an account.

The GMX limit, plainly

Sources: GMX help — October 2026.

A TransferThing link
Drop the file here, paste the link into your GMX mail. Up to 5 GB, without an account for you or the recipient.
A GMX Cloud share link
GMX suggests sending large files as a share link from its cloud. It uses your storage there; check who can open it.
Zip or split
A .zip barely shrinks videos, photos or PDFs. Several e-mails work, but your recipient has to put everything back together.

See what was downloaded, and find your links again.

What is the maximum attachment size on GMX FreeMail?

20 MB, according to GMX’s help. ProMail goes to 50 MB and TopMail to 100 MB.

Does paying for ProMail or TopMail solve it?

Up to 50 or 100 MB. A long video or a folder of photos often goes past that; a link has no such ceiling here up to 5 GB.

Why does a file just under 20 MB still fail?

An attachment is encoded for the e-mail and grows by about a third on the way, so a file close to the limit can go over it.

How do I send a large video with GMX?

Drop it on TransferThing, copy the link and paste it into your GMX mail: up to 5 GB, without an account. The video is not recompressed.

Does the recipient need a GMX account?

Not for a TransferThing link: they download in their browser, without an account.

One file, fifty, or .