Image to Base64

Convert images to Base64 data URLs. Embed images directly in HTML or CSS code.

Image to Base64

📷
Click to upload or drag and drop
PNG, JPG, GIF, WebP, SVG up to 5MB

About Base64 Encoding

Convert images to Base64 for embedding in HTML, CSS, or JSON:

  • Base64 string for direct encoding
  • Data URL for HTML/CSS embedding
  • HTML img tag generator
  • CSS background-image generator

💡 Tip: Use Base64 for small images (icons, logos). Large images increase HTML/CSS file size significantly.

What It Does

An Image to Base64 converter transforms image files into Base64 encoded data URLs that can be embedded directly in HTML, CSS, or JSON. Base64 encoding converts binary image data into ASCII text, making it possible to include images inline in code without separate image files. This is useful for embedding small images in HTML emails (where external images may be blocked), creating self-contained HTML files, bundling images in CSS, or transferring images as text in APIs. The tool shows the Base64 string length and provides both the raw Base64 data and the complete data URL format (data:image/png;base64,...). All processing happens locally in your browser for privacy and speed.

Key Features:

  • Convert images to Base64 encoded strings
  • Generate data URLs for direct embedding
  • Support for JPG, PNG, GIF, WebP, and other formats
  • Display Base64 string length and file size
  • Copy Base64 string or complete data URL
  • Preview embedded image from Base64
  • Format options: raw Base64 or data URL
  • Privacy-focused - all processing in browser

How To Use

Converting images to Base64 is straightforward: upload your image, convert, and copy the Base64 string.

1

Upload Image

Upload your image file by clicking the upload area or dragging and dropping. Supported formats include JPG, PNG, GIF, WebP, and others.

2

Convert to Base64

Click the "Convert" button to generate the Base64 encoded string. The conversion happens instantly in your browser.

3

View Base64 String

See the generated Base64 string and data URL. The tool displays the string length and file size information.

4

Copy Base64 or Data URL

Copy either the raw Base64 string or the complete data URL format, depending on your needs. Data URL includes the format prefix.

5

Use in Your Code

Paste the Base64 string or data URL into your HTML, CSS, or JSON. The image will be embedded inline without needing a separate file.

Pro Tips

  • •Use data URLs for HTML/CSS: data:image/png;base64,...
  • •Use raw Base64 for JSON or API transfers
  • •Base64 increases file size by ~33% - best for small images
  • •Great for icons, logos, and small graphics under 100KB
  • •Not recommended for large images (over 500KB) due to size increase
  • •Base64 images load immediately (no separate HTTP request)

Benefits

Inline Embedding: Include images directly in HTML/CSS without separate files
Email Compatibility: Embed images in HTML emails (external images often blocked)
Self-Contained Files: Create HTML files with embedded images
API Integration: Transfer images as text in JSON or API responses
No External Requests: Base64 images load immediately with the page
Privacy: All processing happens locally in browser
CSS Integration: Use Base64 images in CSS background-image properties
Offline Support: Embedded images work offline without external resources

Use Cases

HTML Email Templates

Embed images in HTML emails using Base64 data URLs, ensuring images display even when external images are blocked.

Convert company logo to Base64, embed in email template: <img src="data:image/png;base64,..." />

CSS Background Images

Embed small icons or graphics directly in CSS using Base64 data URLs.

Convert icon to Base64, use in CSS: background-image: url("data:image/svg+xml;base64,...")

Self-Contained HTML

Create single HTML files with embedded images for easy sharing or offline use.

Convert all images in HTML report to Base64, create single self-contained HTML file

API Data Transfer

Include images in JSON API responses as Base64 strings for easy transfer.

Convert user avatar to Base64, include in JSON API response: {"avatar": "data:image/jpeg;base64,..."}

Small Icons and Logos

Embed small icons, logos, or graphics directly in code to reduce HTTP requests.

Convert 5KB logo to Base64, embed in HTML to eliminate one HTTP request

Frequently Asked Questions

1 Why does Base64 increase file size?
Base64 encoding converts binary data to ASCII text using 64 characters. This conversion increases file size by approximately 33% because Base64 uses 4 characters to represent 3 bytes of binary data. For example, a 100KB image becomes about 133KB when Base64 encoded. This is why Base64 is best for small images.
2 What size images should I convert to Base64?
Base64 is best for small images under 100KB, such as icons, logos, small graphics, or thumbnails. For larger images (over 500KB), the 33% size increase becomes significant and separate image files are usually better. Consider the trade-off: Base64 eliminates HTTP requests but increases file size.
3 How do I use Base64 in HTML?
Use the data URL format in img src: <img src="data:image/png;base64,iVBORw0KGgo..." />. The format is: data:[media-type][;base64],<data>. For example: data:image/png;base64,<base64-string>. The browser will decode and display the image automatically.
4 How do I use Base64 in CSS?
Use the data URL in CSS properties like background-image: background-image: url("data:image/svg+xml;base64,...");. This works in any CSS property that accepts a URL, such as background-image, border-image, or list-style-image.
5 Can I convert Base64 back to an image file?
Yes, you can decode Base64 back to the original image. Many image tools support this, or you can use JavaScript: const blob = new Blob([base64String], {type: "image/png"});. However, if you have the original image file, it's better to keep that rather than converting back and forth, as each conversion may introduce quality loss.
6 Is my image data kept private during conversion?
Yes! All Base64 conversion happens entirely in your browser. Your images are never uploaded to servers, transmitted over the internet, or stored anywhere. This ensures complete privacy and security, which is important when working with sensitive or personal images.

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