What is Image to Base64 Converter?
Image to Base64 Converter encodes image files to Base64 strings (data URI format). Supports PNG, JPG, GIF, WebP, SVG formats, up to 10MB. Generates data:image/png;base64,... format for direct embedding in HTML/CSS. Conversion speed < 1 second with live preview and one-click copy. Ideal for embedding small images (reduce HTTP requests), email templates, Markdown documents. All conversion runs locally in your browser.
▶Use Cases5 scenarios
- ◆Embed small images in HTML/CSS (reduce HTTP requests, improve page load speed)
- ◆Generate email template images (email clients don't support external image links)
- ◆Embed in Markdown documents (single-file distribution, no extra image files)
- ◆Generate data URI for Canvas API
- ◆Debug image loading issues (verify image encoding is correct)
▶How to Use4 steps
- 1Click 'Choose Image' button or drag image to upload area
- 2Select PNG/JPG/GIF/WebP/SVG format image (max 10MB)
- 3View live preview and Base64 output
- 4Click 'Copy' button to copy Base64 string
▶Features8 features
- ✓Supports PNG/JPG/GIF/WebP/SVG 5 formats
- ✓Up to 10MB image size
- ✓Generates standard data URI format (data:image/...;base64,...)
- ✓Live preview of original and Base64 effect
- ✓One-click copy Base64 string
- ✓Shows file size and encoded size
- ✓Browser-based processing (no image upload)
- ✓Responsive design (mobile/tablet/desktop)
▶FAQ8 questions
What is Image to Base64 Converter?
An online tool that encodes image files to Base64 strings. Supports PNG/JPG/GIF/WebP/SVG formats, up to 10MB. Generates data:image/png;base64,... format for direct embedding in HTML/CSS. Conversion speed < 1 second with live preview. Ideal for embedding small images, email templates, Markdown documents. All processing runs locally in your browser.
What image formats are supported?
Supports PNG, JPG, GIF, WebP, SVG — 5 mainstream formats. PNG for icons and transparent images, JPG for photos, GIF supports animation, WebP is modern compression, SVG is vector graphics. Maximum file size 10MB.
How much larger is the file after Base64 encoding?
Base64 encoding increases file size by approximately 33%. Example: 100KB image becomes ~133KB after encoding. This is because Base64 encodes 3 bytes of binary data into 4 ASCII characters. Although size increases, it reduces HTTP requests, suitable for small images (< 10KB) embedding.
How fast is the conversion?
Conversion speed < 1 second with live preview. Images under 10MB typically complete encoding within 500ms. Uses browser's FileReader API and btoa() method for excellent performance.
Is my image uploaded to a server?
No. All conversion runs locally in your browser using FileReader API. Images never leave your device, suitable for sensitive images. Zero server processing, 100% privacy protection.
How do I embed Base64 in HTML?
Place Base64 string in img tag's src attribute: <img src="data:image/png;base64,iVBORw0KGgo..." />. CSS background: background-image: url(data:image/png;base64,...). Note: Only recommend embedding small images (< 10KB), large images should use external files.
What's the maximum image size?
Maximum 10MB image size. Recommend < 10KB small images (icons, logos) for embedding, large images should use external files (avoid oversized HTML). Browser memory limit typically > 100MB, but oversized Base64 strings affect page performance.
Is this tool free? Do I need to register?
Completely free, no registration, no login required. Open the webpage to use all features, no usage limits, no watermarks.