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Convert images to Base64 encoded strings with Data URI, HTML, and CSS output.
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Image to Base64 encodes an image into a text Data URI you can embed directly in HTML, CSS, JSON, or email, and provides ready-to-paste HTML and CSS snippets so it drops straight into your code.
The appeal of inlining is avoiding a separate network request: instead of the browser fetching an image file, the encoded text travels with the page and is decoded in place. That can speed up loading for small, above-the-fold assets and is especially useful in email templates, where externally-linked images are frequently blocked by clients.
The trade-offs define when to use it. Base64 inflates data by roughly a third, and inlined images can't be cached independently, they re-download with the page each time. So inlining wins for small icons and one-off graphics but hurts for large or reused images, where a normal cached file is faster overall.
Encoding runs in your browser, so your image stays private. Pair it with the Base64 Encoder (for text) and the other ToolsMonk developer and image tools for your encoding and asset workflows.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Image Tools |
Upload your image
The tool encodes it as a Base64 Data URI
Copy the Data URI, or the ready-made HTML/CSS snippet
Paste it into your code
Converts an image into a Base64-encoded string
Outputs Data URI, plus ready-to-use HTML and CSS snippets
Embed small images directly in code without a separate file
Processes images in your browser, no upload
One-click copy of any format
Free, with no signup and no watermark added
Embedding a small icon or image directly in HTML or CSS
Inlining an image to avoid an extra HTTP request
Including an image in JSON, an email template, or a data file
Getting a Data URI for a small asset
Inline only small images (icons, tiny logos), Base64 adds ~33% size and can't be cached separately
Great for email templates, where external images are often blocked
Use the ready-made HTML/CSS snippet rather than hand-writing the Data URI markup
Common questions about this tool, its workflow, and what to expect before you use it.
IETF
Defines the Base64 alphabet and padding, and the URL-safe variant.
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Convert images to Base64 encoded strings with Data URI, HTML, and CSS output.
Use Image to Base64 free →Live tool (iframe)
Readers use the real, working tool right on your page, with a small credit line underneath.
Embed card (HTML)