LumaTool
Local Processing

Image to Base64 Converter

Create a Base64 Data URI from an image or preview Base64 image data locally.

Runs locallyNo uploadYour input is processed in your browser.
Image Base64 Converter online tool preview
Image to Base64 Converter Create a Base64 Data URI from an image or preview Base64 image data locally.

Image Base64 Converter

Convert images to Base64 data URLs and preview Base64 image content locally.

What this tool does

This image converter turns image bytes into Base64 and a Data URI containing the MIME type. It can also preview Base64 image data.

What it measures or changes

  • PNG, JPG, WebP and supported browser image formats
  • Raw Base64 and complete Data URI output
  • Image preview and MIME detection
  • Copy Base64, copy Data URI or download the decoded image

Technical details

  • A Data URI adds a media type and ;base64 marker before the payload.
  • Base64 usually increases binary size by about one third and is best for small assets.

Common errors

  • Pasting a text Base64 value that is not an image.
  • Using a large photo inline and increasing page weight.

Best practices

  • Prefer normal image files for large assets.
  • Verify the MIME type before embedding the Data URI.

Examples

Embed a small icon in CSS.

Input example 
logo.png
Output example 
iVBORw0KGgo…

A Data URI adds a media type and ;base64 marker before the payload.

Create an HTML image Data URI.

Input example 
photo.jpg
Output example 
data:image/png;base64,iVBOR…

Base64 usually increases binary size by about one third and is best for small assets.

Inspect Base64 image content from an API.

Input example 
data:image/png;base64,iVBOR…
Output example 
image/png

A Data URI adds a media type and ;base64 marker before the payload.

Privacy note

Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.

How to use

  1. Step 1. Enter or choose an image or Base64 image value.
  2. Step 2. Select the options required for this task.
  3. Step 3. Run Convert image and review validation messages.
  4. Step 4. Copy or download Base64, a Data URI or the decoded image after checking the result.

Real-world examples

Embed a small icon in CSS

Embed a small icon in CSS.

Create an HTML image Data URI

Create an HTML image Data URI.

Inspect Base64 image content from an API

Inspect Base64 image content from an API.

FAQ

What input does Image to Base64 Converter accept?

logo.png photo.jpg data:image/png;base64,iVBOR…

How is the result produced?

A Data URI adds a media type and ;base64 marker before the payload. Base64 usually increases binary size by about one third and is best for small assets.

Is my input uploaded?

Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.

Which options should I choose?

Choose only the options needed to turn an image or Base64 image value into Base64, a Data URI or the decoded image; the defaults preserve the least surprising behavior.

Can I use the result immediately?

Review validation messages and compare a representative sample before using the result in production.

Does it work on mobile?

Yes. The workspace and result controls adapt to desktop and mobile browsers.

What should I do when input is rejected?

Pasting a text Base64 value that is not an image. Using a large photo inline and increasing page weight.

Is processing private?

Processing happens locally in this browser. Your text or file is not uploaded to LumaTool servers.

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