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Image → Base64 Converter

Convert image files to Base64 strings. Generate Base64 code for direct embedding in HTML and CSS.

📁

Click or drag and drop an image here

Supports: JPG, PNG, GIF, WebP (Max 10MB)

About Base64 Images

Base64 encoding converts images into text format that can be embedded directly in HTML, CSS, or JSON. This eliminates the need for separate image files and reduces HTTP requests.

Advantages

  • No additional HTTP requests - faster page load
  • Perfect for small icons and logos
  • Works well in email templates
  • Self-contained HTML files

Disadvantages

  • Increases file size by ~33%
  • Cannot be cached separately by browsers
  • Not suitable for large images
  • Makes code less readable

Best Practices

  • Use for small images (icons, bullets) under 10KB
  • Optimize images before converting
  • Consider SVG for vector graphics instead
  • Use traditional image files for photos

Key Features​

📤 Easy Upload​

  • Click to select file
  • Drag and drop support
  • Up to 10MB supported

🖼️ Preview​

  • Instant preview of uploaded image
  • Display image info (size, resolution, type)
  • Calculate Base64 data size

💻 Code Snippets​

  • HTML <img> tag example
  • CSS background-image example
  • One-click copy function

💾 Export​

  • Copy Base64 string
  • Copy HTML/CSS code

What is Base64 Encoding?​

Base64 is an encoding method that converts binary data to text format. When an image is Base64 encoded, it can be included directly in HTML or CSS.

Regular Image vs Base64​

Regular Method:

<img src="image.png" alt="Image" />

Base64 Method:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA..." alt="Image" />

Advantages​

✅ Reduced HTTP Requests​

  • No additional file downloads needed
  • Faster page loading (for small images)

✅ Self-contained Single File​

  • Everything in one HTML file
  • Ideal for HTML emails

✅ No CDN/Hosting Required​

  • No image hosting server needed
  • Remove external dependencies

✅ Immediately Available​

  • Can render immediately
  • No caching issues (small files)

Disadvantages​

❌ Increased File Size​

  • Base64 is about 33% larger than original
  • Unsuitable for large images

❌ No Browser Caching​

  • Sent with HTML every time
  • Lower reusability

❌ Reduced Code Readability​

  • Lengthens HTML/CSS code
  • Difficult to maintain

❌ No CSS Sprites​

  • Cannot use image combination techniques

When to Use?​

✅ Appropriate Cases​

  1. Icons and Small Images (1-10KB)

    • UI icons
    • Bullet points
    • Small logos

  2. Single HTML File

    • Email templates
    • Offline HTML documents
    • Presentations

  3. Immediate Display Needed

    • Above the fold content
    • Critical UI elements

❌ Inappropriate Cases​

  1. Large Images (>50KB)

    • Photos
    • Background images
    • Banners

  2. Reused Images

    • Used across multiple pages
    • Frequently updated images

  3. SEO-Important Images

    • Product images
    • Blog post images

Supported Formats​

  • JPG/JPEG: Suitable for photos
  • PNG: Supports transparent background
  • GIF: Supports animation
  • WebP: Modern format

Usage Examples​

HTML Image​

<img
  src="data:image/png;base64,iVBORw0KGg..."
  alt="Description"
  width="100"
  height="100"
/>

CSS Background​

.element {
  background-image: url('data:image/png;base64,iVBORw0KGg...');
  background-size: cover;
  background-position: center;
}

Optimization Tips​

1. Compress Images​

Compress images before Base64 conversion:

  • TinyPNG
  • ImageOptim
  • Squoosh

2. Choose Appropriate Format​

  • Photos: JPG (lossy compression)
  • Icons: PNG (lossless, transparency)
  • Simple graphics: SVG (vector)

3. Resize​

Use only required size:

  • 2x Retina: 2x original size
  • 1x: Actual display size

Security Considerations​

⚠️ Beware of XSS Attacks​

When receiving images from users:

  • Validate file type
  • Limit file size
  • Check Content-Type

⚠️ CSP (Content Security Policy)​

Base64 images in CSP img-src policy:

Content-Security-Policy: img-src 'self' data:;

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💬 Was this tool helpful?​

Feel free to send us your feedback or suggestions anytime!

Privacy​

This tool operates entirely on the client side. Your image data is never sent to a server and is processed only in your browser.