Just 2 limitations

1. Image Formats

You can upload images of the following formats:

JPG, PNG, GIF

2. Filesize

The maximum filesize is 1,5 MB. In case of large images you
should consider not to convert them into base64 stream
as we can't allow this to protect our servers.

If you really need to convert large images send us an email
support@base64-image.de and ask for help.