Convert an Image to Base64
Turn an image into a Base64 data URI for CSS, HTML or JSON.
What does Image to Base64 Converter do?
Convert an image into a Base64 data URI you can paste directly into CSS, HTML, JSON or an email template. The output is available as a raw string, a CSS background rule and a ready-made img tag.
How to Use Image to Base64 Converter
- 1Select an imageAny format your browser can read.
- 2Pick an output formatRaw string, data URI, CSS or HTML.
- 3Copy the resultPaste it straight into your stylesheet or markup.
Key Features
- Raw Base64, full data URI, CSS background rule and HTML img tag
- Correct MIME type detected from the file automatically
- Encoded size shown so you can judge whether inlining is worth it
- Warns when the result is large enough to hurt page performance
- One-tap copy for each output format
Frequently Asked Questions
What is a data URI?
A way of embedding a file directly in a document instead of linking to it. The format is data:[mime-type];base64,[data] — the browser decodes it in place, so no separate request is made.
When should I inline an image as Base64?
For very small assets — icons under about 2 KB, or a single critical above-the-fold graphic. Inlining removes a network round trip but the data cannot be cached separately and is 33% larger than the binary.
Why is the Base64 string bigger than the file?
Base64 encodes three bytes as four ASCII characters, so the output is always about 33% larger. Gzip recovers some of that in transit, but the decoded size in your CSS file stays inflated.
Can I use this in an email template?
Sometimes. Data URIs work in Apple Mail and most web clients but are blocked by Outlook and Gmail on the desktop. Host the image and link to it if broad email support matters.
Explore Related Workflows & Utilities
More tools in Image Tools and related problem-solving tools
Direct Workflow Extensions
Decode a Base64 string back into a viewable, downloadable image.
Encode text to Base64, with UTF-8 and URL-safe support.
Decode Base64 back to readable text, standard or URL-safe.
Encode any file as Base64 or a data URI.
Shrink JPG, PNG and WebP files without leaving your browser.
Create every favicon size a website needs from one image.
Complementary Utilities across Categories
Topical Deep Dives & Guides
Popular Related Searches for Image to Base64 Converter
Your image is read straight from your device by the browser and processed on a canvas in this page. It is never uploaded, stored or sent anywhere — you can disconnect from the internet after the page loads and the tool still works.
Related Tools
Base64 to Image Converter
Decode a Base64 string back into a viewable, downloadable image.
Base64 Encoder
Encode text to Base64, with UTF-8 and URL-safe support.
Base64 Decoder
Decode Base64 back to readable text, standard or URL-safe.
File to Base64 Converter
Encode any file as Base64 or a data URI.