Free Online Base64 Converter

Using Micro PDF's Base64 conversion tool, bidirectional conversion between images and Base64 encoding can be achieved: converting JPG/PNG images to Base64 string (convenient for embedding in web pages, CSS or JSON data), or decoding Base64 encoding back to original images (for extracting images from data). The conversion process maintains data integrity and supports automatic generation of HTML/CSS embedding code, suitable for front-end developers and API interface designers handling image data.

Whether embedding small icons in web pages to reduce requests, or extracting images from interface data, Micro PDF handles efficiently. Free users support basic conversion functions to meet development needs.

Table of Contents

• Key Points
• How to Use Micro PDF for Base64 Conversion
• Conversion Scenarios and Code Generation
• Advantages and Disadvantages of Base64 Encoding
• Multi-Platform Support and Batch Conversion Features
• Frequently Asked Questions

Key Points

• Bidirectional conversion: Supports image→Base64 encoding (encoding) and Base64 encoding→image (decoding), covering all usage scenarios.
• Automatic code generation: When encoding, HTML <img> tags and CSS background-image code can be generated for direct copy-and-use.
• Format compatibility: Supports mainstream image formats like JPG, PNG, WebP, GIF, with format information preserved after encoding.
• Free and unlimited: Single image/encoding string up to 10MB converts free daily without limit, no registration required.
• Real-time preview: Real-time display of results during encoding and decoding processes for easy confirmation of conversion effects.

How to Use Micro PDF for Base64 Conversion

Micro PDF's Base64 conversion tool is simple to operate with two modes:

Mode 1: Image to Base64 (Encoding)

1. Visit Micro PDF official website: Micro PDF, click on the "Base64 Converter" tool entry, select "Image to Base64".
2. Upload image: Click "Select Image" or drag and drop files (supports JPG/PNG etc., single file ≤10MB).
3. Select output format:
   • Pure Base64 string (no prefix);
   • With MIME type prefix (e.g., data:image/png;base64,..., default option, convenient for direct use);
4. Click "Start Encoding", after generation choose "Copy String" or "Download Code File" (TXT format), also supports generating HTML/CSS embedding code.

Mode 2: Base64 to Image (Decoding)

1. Select "Base64 to Image" at tool entry.
2. Input Base64 string: Directly paste with MIME prefix encoding (e.g., data:image/jpg;base64,...).
3. Click "Start Decoding", tool automatically identifies image format, click "Download Image" to save after generation (format consistent with original image).

Efficient Usage Tips

• Web embedding of small icons: Convert ≤10KB icons to Base64, generate <img> tags embedded in HTML, reduce HTTP requests (improve loading speed).
• API data transmission: Encode and transmit image data via JSON, avoid file upload interface development, suitable for lightweight scenarios.
• Code reuse: Generated CSS background image code (e.g., background-image: url("data:...")) can be directly copied to stylesheets without additional image files.

Conversion Scenarios and Code Generation

Best practices for different scenarios and code examples generated by the tool:

Advantages and Disadvantages of Base64 Encoding

Understanding Base64 encoding characteristics is necessary to make reasonable scene choices:

Recommendation: Only use Base64 encoding for images ≤100KB, larger images still recommend conventional image reference methods.

Multi-Platform Support and Batch Conversion Features

Micro PDF Base64 conversion tool supports development scenarios:

• Web-based: Computer browser online conversion, generated code can be directly copied to development tools, suitable for front-end development.
• Developer tools: Provides API interface (VIP), supports backend batch encoding/decoding, suitable for automated processing.
• Desktop: Client supports local file batch encoding, generates batch embedding code, suitable for bulk icon processing.

Frequently Asked Questions

1. What to do if the converted Base64 string cannot display the image?

• Check if MIME prefix is included (e.g., data:image/png;base64,), missing prefix may cause recognition failure;
• Confirm string is not truncated (complete Base64 strings typically end with == or =).

2. Can free users batch convert images to Base64?

Free users support single conversion of 1 image; VIP users support single batch conversion of 10 images and generate merged code files.

3. Is it suitable to convert large images to Base64?

Not suitable. A 1MB image encodes to about 1.3MB, embedding in code causes HTML/CSS files to become too large. Recommend using only for small images (≤100KB).

4. Can search engines recognize Base64 encoded images?

Yes. Modern search engines can parse Base64 embedded images, but recommend important images still use conventional <img> tags with alt attributes for SEO optimization.

5. What to do if "Format Error" is prompted during decoding?

• Check if Base64 string is complete (may be incomplete due to copy issues);
• Confirm string corresponds to correct image format (e.g., MIME prefix image/png but actual JPG encoding).

6. Can animated GIFs be converted to Base64?

Yes. Animation effects are preserved after encoding, generated <img> tags can directly display animated images, but file size is large (recommend animations ≤500KB).

7. Does Base64 encoded images affect loading speed?

Depends on size: Small icons (≤10KB) can improve speed (reduce requests); Large images slow loading (code parsing takes more time), need balanced selection.