Introduction
Base64 encoding lets you embed images directly into HTML, CSS, or email as a text string — eliminating the need for separate image files and extra HTTP requests. This guide explains when and how to use it.
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Open Image to Base64 ConverterWhat Is Base64 Image Encoding?
Base64 converts binary image data into a string of ASCII characters. The result — called a Data URI — can be pasted directly into HTML `src` attributes, CSS `url()` values, or email `img` tags. The browser decodes and renders it without fetching an external file.When Should You Use Base64 Images?
- Small icons & logos — saves an HTTP request for tiny images
- HTML email — inline images that display even when external images are blocked
- CSS background images — avoids flicker on load
- Single-file HTML apps — completely self-contained
- Canvas & SVG data — pass images to JavaScript APIs
Base64 increases file size by ~33%. Don't use it for large images — use regular src with CDN instead.
How to Convert Image to Base64
Upload Your Image
Click Upload or paste an image URL. Supports JPG, PNG, GIF, WebP, SVG.
Copy the Output
The full Base64 Data URI appears instantly. Click Copy to clipboard.
Use in Your Code
Paste into HTML src, CSS url(), or email template.
Using Base64 in HTML & CSS
HTML: <img src="data:image/png;base64,iVBOR...">
CSS: background-image: url('data:image/png;base64,iVBOR...');
Frequently Asked Questions
Up to 10MB. For larger images, Base64 is not recommended — use a CDN instead.
No. Base64 is lossless encoding — it's just a different representation of the same binary data.
Yes — our tool also decodes Base64 strings back to downloadable image files.
JPG, PNG, GIF, WebP, BMP, SVG, ICO — all supported.
Yes. The image data never leaves your browser — all conversion is done client-side.
Base64 adds ~33% overhead. A 100KB image becomes ~133KB as Base64. This is normal.
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