"drag n drop" application to convert images to base64 string (for web development)
Base64 Automator Droplet

You can use Automator to create your own Base64 droplet. Mac OS X includes openssl which can encode files to Base64; this superuser question explains how, OS X: Base64 encode via command line


Launch Automator.app
Create a new application
Add a Run Shell Script action
Set Pass input: to as arguments
Within the script, replace echo with the script below.
Save your workflow as an application


To use your application, drag and drop files onto it. A new base64 encoded file will appear next to the original file.

Shell Script

for f in "$@"
do
    openssl base64 -in "$f" -out "$f.b64"
done




To learn more about using Automator, see Apple's Mac Basics: Automator.