Convert an image to a Base64 data URI for inline embedding.
Processed locally — your image is never uploaded.
How do you convert an image to a Base64 data URI?
The file is read as a data URI in the form data:[mime];base64,[encoded bytes], where Base64 encoding adds about 33% to the byte size. A small PNG icon becomes data:image/png;base64,iVBORw0KGgo… ready to paste inline. Inlining saves a network request, which suits tiny images. Everything runs in your browser.
Understanding your result
Inlining saves a network request, which suits tiny images. For larger files the Base64 string gets big, so a normal image file is usually better.
Formula and method
The file is read as a data URI: data:[mime];base64,[encoded bytes]. Base64 encoding adds about 33% to the byte size.
Assumptions and limitations
Base64 encoding adds roughly a third to the byte size, so the string grows quickly for anything but small images. Large files produce unwieldy code that can slow parsing and is harder to cache than a normal image request, so a separate file is usually better beyond tiny icons.
Worked example
A small PNG icon becomes data:image/png;base64,iVBORw0KGgo… ready to paste inline.
How to use this tool
- Choose an image file.
- Copy the generated data URI.
- Paste it into an img src or a CSS background.
Common mistakes to avoid
- Inlining large images, which bloats your HTML or CSS and slows parsing.
About the Image to Base64
Convert an image into a Base64 data URI you can embed directly in HTML or CSS, with no separate file request. Everything runs in your browser.
Who should use this tool
Developers inlining small images, icons or email assets to cut HTTP requests.
Benefits
- The file is read locally in your browser, so nothing is uploaded to a server.
- A data URI inlines the image directly into HTML or CSS, saving a separate network request.
- The result is plain text you can paste anywhere source code or stylesheets are edited.
- Small icons and glyphs embed cleanly with no external file to host or manage.
Practical use cases
- Embedding a tiny icon straight into a CSS background rule to avoid an extra request.
- Inlining a small logo in an HTML email where external images may be blocked.
- Adding a placeholder graphic to a single-file prototype or code snippet.
- Storing a small image inside a JSON payload or configuration string as text.
Frequently asked questions
Is my image uploaded?
No. The file is read locally in your browser and never sent to a server.
When should I use a data URI?
For very small, rarely-changing images. For anything large, a regular image file is more efficient and cacheable.
Why is the Base64 string larger than the original file?
Base64 represents binary bytes using a limited set of printable characters, which adds about 33% to the size. That overhead is negligible for a small icon but becomes significant for photographs, which is why a normal image file is usually the better choice for anything large.