Utilities
Image Base64
Convert images to Base64 data URLs for CSS and HTML embeds.
About Base64 Image
Embed an image directly into HTML or CSS as a data URI by encoding it to base64. Eliminates an HTTP request for tiny icons and is required for inline email images.
Frequently asked questions
When is a base64 image bigger than a regular file?
Always: base64 adds roughly 33 percent overhead. Use it only for small images where saving the HTTP round-trip matters more than the size cost.
Do email clients support data URIs?
Most do, but Gmail blocks them for security. For email, either inline-embed using CID attachments or host the image externally.