Image to Base64 Converter

Convert an image file into a Data URL Base64 string, no server upload.

Category: Image Tools

When to use?

Use it to temporarily embed a small icon or test image inside HTML, CSS, or JSON.

How to use

  • Select an image.
  • Check the generated Data URL.
  • Copy the string if needed.

Input Explanation

Select a small image file to convert to Base64 text.

Calculation Basis

It encodes the file's binary data into a Base64 ASCII string and returns a Data URL like "data:image/png;base64,...".

Usage Examples

  • Make embedded images - Create a Data URL for a small image.
  • Prepare images for upload - Preview the result, then tidy images for blogs, shops, or social media.
  • Compare results - Check original and result side by side for quality and size.

Examples

  • A 1KB icon image → about a 1.33KB Base64 string (embeddable in HTML/CSS)
  • A 24×24 icon → a Data URL to inline in CSS

Cautions

  • Base64 is about 33% larger than the original, so it is not suitable for large images.
  • Extremely high-resolution large files may fail to convert due to browser image-decoding limits.

FAQ

Is the original file uploaded?

No. FileReader reads the local file in browser memory.

Is the image sent to a server?

No. FileReader reads and converts the local file in browser memory, so the image is not sent out.

What images is this good for?

Size grows about 33%, so it suits small icons or test images; keep large photos as regular files.

Does Base64 increase size?

Base64 encoding is about 33% longer than the original. Good for small icons, not large images.

Related Tools