What is a Base64 data URI?

A data URI is a way to embed file contents directly in HTML or CSS. The image is converted to Base64 text that browsers can display without separate HTTP requests.

When should I use Base64 images?

Base64 images are useful for small icons, logos, or when you want to reduce HTTP requests. Large images should use regular URLs as Base64 increases file size by ~33%.

Encoding & Decoding

Image to Base64

Convert images to Base64 data URIs for embedding.

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How to Use Image to Base64

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Frequently Asked Questions

What is a Base64 data URI?: A data URI is a way to embed file contents directly in HTML or CSS. The image is converted to Base64 text that browsers can display without separate HTTP requests.
When should I use Base64 images?: Base64 images are useful for small icons, logos, or when you want to reduce HTTP requests. Large images should use regular URLs as Base64 increases file size by ~33%.

Sources & references

Primary references: RFC 2397: The data URL Scheme.

Last reviewed: 2026-07-13