What is Base64 encoding for images?

Base64 encoding converts binary image data into ASCII text characters. This allows images to be embedded directly in HTML, CSS, or email templates as data URIs without requiring separate image files or external URLs. The encoded string starts with 'data:image/...'.

When should I use Base64 images?

Use Base64 for small images under 10KB (icons, logos), email templates where external images may be blocked, single-file HTML documents, or to reduce HTTP requests. Avoid for large images as Base64 increases data size by approximately 33%.

Does Base64 increase file size?

Yes, Base64 encoding increases data size by approximately 33%. A 10KB image becomes about 13.3KB in Base64. This trade-off is acceptable for small images but not recommended for photos or large graphics where the size increase impacts performance.

Can I convert multiple images at once?

Yes, upload multiple images simultaneously for batch conversion. Each image is processed in parallel (up to 6 at once) and displayed with its own HTML, CSS, and raw Base64 output. A progress bar shows batch completion status.

Are my images uploaded to a server?

No, all conversion happens locally in your browser using the FileReader API. Your images never leave your device, ensuring complete privacy and security. The tool works offline after the page loads.

Image to Base64 Converter - Encode Images for HTML & CSS

How to Use

Upload one or more images by dragging & dropping or clicking to browse (JPG, PNG, GIF, WebP, SVG, BMP).
Wait for automatic conversion - instant for most images, with progress bar for batches.
View each image with preview, dimensions, file size, and MIME type information.
Select your output format: HTML img tag, CSS background-image, or Raw Base64 data URI.
Click the copy button to copy the generated code to your clipboard instantly.
Paste directly into your HTML, CSS, email template, or any code file.

How it Works

Base64 encoding converts binary image data into ASCII text using 64 printable characters. This allows images to be embedded directly in code without external file references.

HTML Format

Complete <img> tag with data URI, width, and height attributes

CSS Format

background-image property with data URI for use in stylesheets

Raw Format

Pure data URI string for email templates or custom implementations

Batch Processing

Convert multiple images simultaneously with parallel processing

Common Use Cases

Web Development

• Embed icons in single-file HTML for easy distribution
• Reduce HTTP requests by inlining small images
• Create self-contained web components without dependencies
• Inline images in CSS sprites for faster page loads
• Generate data URIs for performance-critical assets

Email & Documents

• Embed images in HTML emails to avoid blocking
• Bypass external image restrictions in email clients
• Create portable HTML documents with embedded assets
• Include logos in email signatures without hosting
• Build self-contained newsletters for reliable delivery

Single-File Applications

• Create standalone HTML files for easy sharing
• Eliminate external dependencies for offline use
• Build portable documents that work anywhere
• Archive web content with all assets embedded

CSS & Styling

• Embed small icons and patterns in stylesheets
• Reduce HTTP requests for faster initial render
• Speed up page load by inlining critical images
• Create inline sprites for icon systems

Image to Base64 Converter

Convert Images to Base64

Web Development

Email & Documents

Single-File Applications

CSS & Styling

More Image Tools

Convert Images to Base64