What is Base64 Image Encoding?
How does it work?
Base64 is an encoding algorithm that transforms any binary data, including images, into text format containing only readable ASCII characters. When you convert an image to Base64 — creating a Data URI — you can embed it directly into HTML, CSS, or JSON without relying on external file requests.
Why convert images to Base64?
- Fewer HTTP Requests: Embedding images directly removes separate file downloads, speeding up page load for small icons and assets.
- Offline Availability: Data URIs embedded in HTML or CSS load without a network connection.
- Streamlined Emails: HTML emails often block external images — Base64 encoding bypasses this for signatures and logos.
- API Portability: Many REST APIs only accept JSON text. Base64 lets you send images as simple JSON string payloads.
Is this converter secure?
Yes! img64 operates completely locally in your browser. Files never leave your device — no server upload, no logging, guaranteed 100% privacy.