Image to Base64
Convert images to Base64 text for embedding in code.
Convert images to Base64 for web development
Base64 is an encoding system that converts binary data (like images) into ASCII text. This allows embedding images directly in HTML, CSS, or JavaScript without separate files. It is especially useful for small images like icons.
Base64 encoding increases data size by approximately 33%. For this reason, it is recommended primarily for small images (less than 10 KB). For larger images, serve them as separate files.
Our tool converts any image to Base64 instantly in your browser. You get three output formats: pure Base64 string, complete data URI, and ready-to-paste HTML img tag. Each format includes a one-click copy button.
Frequently asked questions
Why is Base64 larger than the original file?
Base64 encodes every 3 bytes of binary data into 4 ASCII characters, resulting in an approximately 33% increase. This is inherent to the encoding system and is the cost of converting binary data to plain text.
When should I use images in Base64?
It's ideal for small images like icons (less than 10 KB), HTML emails, offline applications, or when you want to reduce the number of HTTP requests. For large images, it's better to serve them as separate files.
Can I use the data URI in CSS?
Yes. You can use the complete data URI in the CSS background-image property, for example: background-image: url(data:image/png;base64,...). This is useful for backgrounds, sprites, and decorations that don't need external loading.