Image to Base64 Converter – Convert Image to Base64 Online



Quick answer

Upload an image and the tool instantly converts it into a Base64-encoded string you can copy and embed in code.

Key facts

  • Runs entirely in your browser via JavaScript, using the FileReader API|No file is uploaded to a server -- the image is read and encoded locally|Output can typically be copied as a raw Base64 string or a data URI|Free with no usage limit|Larger images produce longer Base64 strings, increasing embedded file size

What is this tool?

This tool converts an image you select into a Base64-encoded string, useful for embedding small images directly into HTML, CSS, or JSON without a separate image file.

How to use it

Select your image file; the tool reads it locally and displays the Base64-encoded string, ready to copy into your code.
  1. Select or upload the image you want to convert.|The tool reads the file locally and encodes it as Base64.|Copy the resulting Base64 string or data URI.

Example

Example: uploading a small PNG icon produces a Base64 string you can use directly as ``.

How it works

The page uses the browser's built-in FileReader API to read your selected image file and encode its binary data into a Base64 text string, entirely on your device with no upload involved.

Common use cases

Embedding a small icon or logo directly into HTML or CSS without a separate file.|Including image data in a JSON payload for an API.|Avoiding extra HTTP requests for very small images.|Quickly inspecting an image's Base64 representation for debugging.

Benefits

Free, instant, and keeps your image entirely on your device during conversion.

Limitations

Base64-encoded images are roughly 33% larger than the original binary file size, so embedding large images this way can bloat HTML/CSS/JSON file size; very large images may be slow to encode in the browser.

Privacy & your data

Your image is read and encoded locally in your browser using the FileReader API. It is not uploaded to or stored on the A2Z Tools server.

Frequently asked questions

Does Base64 encoding increase file size?
Yes. Base64-encoded data is roughly 33% larger than the original binary file, so this approach is best suited to small images rather than large photos.
Is my image uploaded to a server?
No. Your image is read and encoded locally in your browser using the FileReader API; it is not uploaded to or stored on the A2Z Tools server.
Can I use the output directly as an image source in HTML?
Yes, if you copy the full data URI format (starting with `data:image/...;base64,`), it can be used directly as an `` tag's `src` attribute.
Is this tool free to use?
Yes, it's free with no signup required.

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