Image to Base64
Turn images into data URIs with ready-to-use snippets
What is Image to Base64?
This image-to-Base64 converter encodes a picture as a data URI in the browser and gives you HTML and CSS snippets you can paste straight into your code, along with the size overhead the encoding adds. The file is read locally and never uploaded.
How to use Image to Base64
- 1Choose an image — under 100 KB is a good rule of thumb.
- 2Check the size overhead to decide whether inlining is worth it.
- 3Copy the data URI, or grab the ready-made CSS or HTML snippet.
Frequently asked questions
When is it worth inlining an image as Base64?+
Two cases. First, very small icons of a few kilobytes, where inlining saves an entire request. Second, a critical above-the-fold placeholder, where inlining prevents a visible flash. Everything else belongs in a separate file so the browser and your CDN can cache it independently.
Why does Base64 encoding increase the file size by 33%?+
Base64 represents every 3 bytes of data with 4 ASCII characters, which is a fixed one-third overhead. If you inline that payload into CSS or JavaScript, those extra bytes also delay the parsing of a render-blocking resource — the hidden cost of inlining.
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