Base64 Encoder
Convert images into Base64 strings for CSS/HTML embedding, or decode strings back to images.
Click to upload image
Supports JPG, PNG, WebP, GIF
How it works
A compact workflow from input to download.
Choose Mode
Select whether you want to encode an image to Base64, or decode a Base64 string back into an image.
Input Data
Upload your image file, or paste your raw Base64 string into the text area.
Copy or Download
Copy the formatted data URI string to paste into your code, or download the decoded image file.
Frequently asked questions
Why use Base64 for images?
Does Base64 increase file size?
What format does it output?
Can I decode a Base64 string?
Is my data uploaded?
Understanding Base64 Image Encoding
Base64 encoding translates binary data (like an image file) into a long string of ASCII text characters. This is incredibly useful in web development because it allows developers to embed image data directly into HTML, CSS, or JSON files. Instead of the browser making a separate HTTP request to fetch an image file, the image is parsed immediately along with the code, which can improve load times for small icons and critical UI elements.
When to Use Base64 (And When Not To)
Base64 is perfect for small SVG icons, tiny placeholder images, or embedding visuals in self-contained documents. However, encoding adds about 33% overhead to the file size compared to raw binary. Therefore, it is strongly discouraged to encode large photographs or hero images as Base64, as it will dramatically bloat your HTML/CSS files, bypass browser caching mechanisms, and ultimately slow down your web page.
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