Image to Base64 Converter

Upload images and convert them to Base64 encoded strings, support copying or downloading results

1 uses | 5.0 rating

Image Upload

Include data:image prefix

Exclude prefix

Select Image

Drag and drop image here, or

Conversion Result

Not Processed

Please upload and convert an image to view results

Instructions

Select Output Format

Choose whether to include the data:image prefix based on your needs.

Upload Image

Drag and drop image to the upload area or click browse button to select an image.

Convert Image

Click the "Convert to Base64" button, and the system will convert the image to Base64 encoding.

Copy or Download Result

After conversion, you can copy the Base64 encoding or download it as a text file.

Preview Image

You can preview the restored image effect through the Base64 encoding.

Base64 Basics

What is Base64 Encoding?

Base64 is an encoding method that represents binary data using 64 printable characters. It is commonly used in scenarios where binary data needs to be transmitted through text protocols, such as embedding images in HTML, CSS, JavaScript, or transmitting binary content in HTTP requests.

Application Scenarios for Image to Base64

Web Development

Embed small images directly into HTML/CSS to reduce HTTP requests and improve page loading speed. Especially suitable for icons, small decorative images, etc.

Data Transmission

Transmit image data in text-only protocols such as JSON API, XML data, email attachments, etc.

Data Storage

Store images directly as text format for easy saving in databases, configuration files, or plain text documents.

Secure Transmission

Use in scenarios requiring secure transmission of binary data, such as HTTP Basic Authentication credential encoding.

About data:image Prefix

Base64 encoded images can include or exclude the prefix, both serving different purposes:

With Prefix (data:image/jpeg;base64,)

Can be directly used in HTML img tag src attribute or CSS background-image property, browsers can correctly recognize and display the image.

Without Prefix

Suitable for scenarios where prefix needs to be manually added or used in specific systems, such as certain API requests, database storage, etc.

Pros and Cons of Base64 Encoding

Advantages

Reduces HTTP request count, improves loading speed for small images
Can be embedded in plain text formats for easy data exchange
No need for additional file references, simplifies project structure
Avoids cross-domain issues and image caching problems

Disadvantages

Encoded data volume increases by about 33%, not suitable for large images
Cannot be cached separately, needs to be parsed again on each page load
Increases the size of HTML/CSS/JS files
Not suitable for frequently updated images, modifications require re-encoding

Tips

For small images under 10KB (such as icons, small buttons), converting to Base64 can improve page performance; for large images, it is recommended to still use separate image files.
In web development, Base64 images can be embedded using CSS url(data:image/...) format or directly in HTML img tag src attribute.
If you need to transmit Base64 images in JSON data, it is recommended to compress the image first before encoding to reduce data volume.
Base64 encoding with prefix can be directly pasted into browser address bar to view the image effect, convenient for quick verification.

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