Image to Base64
Convert any image to a Base64 encoded string. Get ready-to-use data URIs for HTML, CSS, and JSON embedding.
Free Image to Base64 Converter
Convert any image file to a Base64 encoded string that can be embedded directly in HTML, CSS, or JSON. This eliminates separate HTTP requests for small images — useful for icons, logos, email templates, and single-file HTML documents. Everything runs in your browser with no server upload.
Output Formats
Data URI gives you the complete data:image/... string ready to use in src attributes. Raw Base64 provides just the encoded string without the data URI prefix. HTML output wraps it in an img tag. CSS output formats it as a background-image property. JSON output provides a properly escaped string for API payloads and configuration files.
When to Use Base64 Images
Small icons and logos (under 10KB) where eliminating an HTTP request improves performance. Email HTML templates where external images may be blocked. Single-file HTML documents that need to be self-contained. CSS sprites replacement for small UI elements. Embedding images in JSON API responses or configuration files.
Frequently Asked Questions
Base64 encoding increases file size by approximately 33%. A 10KB image becomes about 13.3KB as Base64 text. For small images (under 10KB), this overhead is offset by saving an HTTP request. For larger images, use regular file references instead.
For small images, Base64 embedding improves speed by reducing HTTP requests. For large images (over 10-20KB), it's slower because the Base64 string increases HTML/CSS file size and can't be cached separately. Use Base64 only for small assets.