Image to Base64 Converter

Convert images to Base64 encoding instantly in your browser. Get ready-to-use Base64 strings, HTML img tags, and CSS background code. Perfect for embedding images in HTML, CSS, emails, or JSON. No uploads, completely private.


Select an image to convert to Base64

How to Convert Image to Base64

  1. Click "Select Image" and choose an image file from your device
  2. The image will be instantly converted to Base64 format
  3. View the Base64 string, HTML tag, and CSS background code
  4. Click "Copy to Clipboard" to copy the Base64 string
  5. Or copy the ready-to-use HTML or CSS code snippets
  6. Download the Base64 string as a .txt file if needed

Key Features

Instant Conversion

Convert images to Base64 instantly in your browser. No upload delays, no server processing - just drag, drop, and convert.

Ready-to-Use Code

Get Base64 string, HTML img tag, and CSS background-image code all formatted and ready to paste into your projects.

One-Click Copy

Copy Base64 strings, HTML, or CSS with a single click. No manual selection needed - just click and paste.

100% Private

All conversion happens locally in your browser. Your images never leave your device, ensuring complete privacy.

When to Use Base64 Images

Email Templates

Embed images directly in HTML emails without external hosting. Perfect for logos, icons, and small graphics that need to work across all email clients.

CSS Sprites & Icons

Embed small icons and UI elements directly in CSS files. Reduces HTTP requests and eliminates the need for separate image files.

Data URIs in HTML

Include images directly in HTML without separate files. Great for single-page applications, offline-first apps, or reducing file dependencies.

API Responses

Send images as Base64 strings in JSON or XML responses. Useful for REST APIs, webhooks, or data interchange formats.

Markdown & Documentation

Embed images in Markdown files, README documents, or wikis without managing separate image files or hosting.

Best Practices

File Size Considerations

Base64 encoding increases file size by approximately 33%. Use Base64 for small images (under 10KB) like icons, logos, and thumbnails. For larger images, traditional image files are more efficient.

Browser Caching

Base64 images in CSS or HTML cannot be cached separately. Consider using external files for frequently reused images to leverage browser caching.

Code Readability

Long Base64 strings can make code harder to read. Consider extracting them to separate CSS files or JavaScript constants for better maintainability.

Performance Impact

Base64 images block rendering until the entire string is parsed. Use sparingly in critical rendering paths and consider lazy loading for non-essential images.

Frequently Asked Questions

Base64 is a binary-to-text encoding scheme that converts binary image data into ASCII text. This allows images to be embedded directly in HTML, CSS, or JSON as text strings.

No! Base64 is a lossless encoding. The decoded image is identical to the original. However, the encoded string is about 33% larger than the original file.

While there's no hard limit, we recommend keeping files under 1MB for best performance. Very large Base64 strings can slow down page rendering and make code difficult to manage.

No! All conversion happens locally in your browser using the FileReader API. Your images never leave your device, ensuring complete privacy and security.

Yes! Browsers automatically decode Base64 images in HTML img tags or CSS backgrounds. You can also use online tools or programming languages to decode Base64 strings back to image files.

We support all common web formats: JPG, PNG, GIF, BMP, WEBP, and SVG. The Base64 output will include the correct MIME type for each format.