Google has always been fairly lenient when it comes to attaching large files which was nice. Before they had a 10MB limit, but some people had said that Google would allow up to 15MB worth of attachments which was pretty cool. On May 15th they officially bumped the maximum attachment size up to 20MB!

My curiosity got the best of me so I started tinkering around to see how much I could actually attach. My thought was that if they were previously forgiving when going over the attachment limit, that they probably were now as well. So I attached 19.98MB worth of files to a single message:

Gmail Attachment Size

And when I went to attach another file…

Gmail Attachment Size

Even though they updated their help page with the 20MB attachment size, they haven’t done so for their notification box yet. This is definitely proof that they are sticking to their guns on the attachment size this time around.

Gmail is almost leading the way for free email services with their attachment size only to be beaten by Lycos. Here is a table summarizing what other email services are offering for attachment sizes (some information taken from Wikipedia):

Service Cost Storage Size Attachment Size
Gmail FREE 2.8GB+ 20MB
Windows Live Hotmail FREE 2GB 10MB
Windows Live Hotmail Plus $20/year 4GB 20MB
Yahoo! Mail FREE 1GB 10MB
Yahoo! Mail Plus $20/year 2GB 20MB

One other thing that has bugged me for a little while is when Google shows the size of the files being attached. They are using “kb” as if it was equal to “KB”, but there is a clear difference between the two values. The “kb” stands for kilobits while “KB” stands for kilobytes, and there is of difference of 8–times between the two. Even their calculator knows the difference when converting from kilobits and from kilobytes.

 Source: Google Operating System