UtilityBaseDeveloper Tools
Image to Base64 Encoder
Convert an image to a Base64 data URI for embedding in HTML, CSS, or JSON — with copy-ready formats.
Updated July 10, 2026
How to use the image to base64 encoder
- 1Drop an image or click to choose one.
- 2Review the preview and the size comparison.
- 3Pick an output format: data URI, raw, HTML, CSS, or JSON.
- 4Click Copy and paste it into your code.
Common uses
- Inlining a small icon in HTML or CSS
- Embedding an image in a JSON payload
- Creating a self-contained HTML email
- Avoiding an extra request for a tiny asset
Frequently asked questions
When should I use a Base64 image instead of a file?
Inlining as Base64 avoids a separate network request, which is handy for small icons, spritesheet-free UI bits, or emailing self-contained HTML. For larger images it's usually worse, because Base64 adds about a third to the size and can't be cached separately.
Why is the Base64 string bigger than my image?
Base64 encodes three bytes of data into four text characters, so it's roughly 33% larger than the original binary. The tool shows the exact difference so you can judge whether inlining is worth the extra weight.
Can I embed the result in CSS?
Yes. Choose the CSS format to get a ready-to-paste background-image rule using the data URI, or the HTML format for an img tag. The raw and data-URI options cover JSON and other uses.
About this tool
The image to Base64 encoder converts PNG, JPG, SVG, WebP, or GIF images into a Base64 data URI you can embed directly in code — no separate file request needed. Drop in an image and copy it in the exact format you want: a full data URI, the raw Base64 string, a ready-to-paste HTML img tag, a CSS background-image rule, or JSON. It shows the size difference so you can see the roughly 33% Base64 overhead and decide whether inlining is worth it. Everything is encoded locally with the browser's FileReader API — your image is never uploaded.
Like most tools on UtilityBase, the image to base64 encoder runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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