In previous time, Gmail supported only 18 MB or less attachment. Most recently Google increased the maximum attachment size within 20MB to 25MB. Now, it’s more easier to share big size files with your friends. In compare of other email service, Gmail giving the biggest file uploading service ever. Gmail Increases Maximum Attachment Size to 25 MB – “Now you can send bigger attachments in Gmail, as Google increased the maximum attachment size from 20 MB to 25 MB” — informed by Alex.
“With Gmail, you can send and receive messages up to 25 megabytes (MB) in size. Please note that you may not be able to send larger attachments to contacts who use other email services with smaller attachment limits. If your attachment bounces, you should invite them to Gmail,” suggests Google.