How to Use
- Drag a PNG, JPG, SVG, WebP, or GIF image into the upload area, or click to choose files.
- Confirm the image preview, MIME type, original size, and Data URI output size.
- Copy the full Data URI, raw Base64 string, CSS
background-image, or HTML<img>snippet. - Paste the code into CSS, HTML, email templates, or JSON configuration.
Example: click โLoad SVG Sampleโ to generate a local SVG icon as a Data URI, then copy the CSS or HTML snippet.
Core Features
- Instant Data URI Generation: Drop an image and generate a
data:image/...;base64,...URI directly in your browser. - Ready-to-Use CSS & HTML: Copy CSS
background-imageor HTML<img>snippets without writing the Data URI prefix by hand. - Supports Web Image Formats: Works with PNG, JPG, SVG, WebP, GIF, AVIF, and other image formats your browser can read.
- Batch Image Queue: Drop multiple icons, email assets, or UI images and copy the exact snippet you need per file.
- 100% Private Processing: Images are read locally with the browser
FileReaderAPI. Nothing is uploaded.
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Calculation Logic
Base64 encoding turns binary image data into an ASCII string, which lets images be embedded directly in HTML, CSS, or JSON. A Data URI follows the shape data:[mime-type];base64,[encoded-data], and browsers can read it as an image resource.
Important trade-off: Base64 is not image compression. Encoded output is usually about 33% larger than the original file, so it is best for small icons, logos, email images, or reducing a small number of HTTP requests. Large photos and many assets should usually remain as normal image files and be compressed separately.
FAQ
Why convert an image to Base64?
It is useful when you want to embed small icons, email images, or configuration images directly in code, reducing external requests or avoiding blocked remote email images.
Does Base64 reduce image size?
No. Base64 usually increases the encoded size by about 33%. It helps with embedding and request reduction, not storage compression.
What image formats are supported?
PNG, JPG, JPEG, SVG, WebP, GIF, AVIF, and any image format your browser can read.
Are my images uploaded?
No. Conversion uses the browser-native FileReader.readAsDataURL API, so files stay on your device.
Can I copy CSS or HTML directly?
Yes. Each image gets a full Data URI, raw Base64 string, CSS background-image, and HTML <img> snippet.