Data URI Generator

Data URI Generator

Convert files to Data URIs

Select a file to convert to Data URI (max 10MB)

What is a Data URI?

A Data URI (Uniform Resource Identifier) is a scheme that allows you to embed data directly into a document, rather than referencing an external file. It's commonly used to embed small images, fonts, or other resources directly in CSS or HTML, reducing HTTP requests and improving page load performance.

How to Use Data URI Generator

  1. Upload a file - Drag and drop or select a file from your device
  2. Automatic conversion - The file is converted to base64 and wrapped in a data URI
  3. View output - See the complete data URI string ready for use
  4. Copy to clipboard - Copy the data URI to use in your CSS or HTML

Data URI Generator Features

  • Drag and drop - Easy file upload with drag-and-drop support
  • Multiple formats - Supports images, fonts, and other file types
  • Automatic MIME type - Detects and sets the correct MIME type
  • Size display - Shows original and encoded sizes
  • CSS ready - Output formatted for CSS background-image use
  • One-click copy - Copy the data URI instantly

Frequently Asked Questions

When should I use Data URIs?

Use Data URIs for small files like icons, small images, or fonts that are used on every page. They eliminate HTTP requests, which can improve initial page load. However, avoid using them for large images as they increase HTML/CSS file size and can't be cached separately.

Do Data URIs affect caching?

Yes, Data URIs are embedded in the HTML or CSS, so they're cached along with the parent document. This means they can't be cached separately or reused across pages. For assets used on multiple pages, external files with proper caching headers are usually more efficient.

What file size is too big for Data URIs?

As a general rule, keep Data URIs under 2-3KB for best performance. Base64 encoding increases file size by about 33%, so a 2KB image becomes ~2.7KB when encoded. Very large Data URIs can make your HTML/CSS files unwieldy and slow to parse. Consider external files for anything larger than small icons and UI elements.