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GeekFormat

Data URL Converter

Pure Base64
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Free online tool to convert between Data URL and pure Base64. Add or remove MIME type prefixes instantly. Perfect for embedding inline images in HTML/CSS and preparing API payloads.

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Use Cases

  • Convert pure Base64 strings to Data URLs for embedding inline images in HTML <img> tags and CSS background properties.
  • Strip Data URL prefixes to extract pure Base64 strings for API request bodies and JSON configuration files.
  • Embed SVG icons and small images directly into web pages to reduce HTTP requests and improve loading speed.
  • Debug frontend inline image resources by verifying MIME types and Data URL formatting.

Features

  • Two-way Conversion: Instantly add or remove Data URL prefixes (data:image/...;base64,) with one click.
  • Frontend & CSS Ready: Perfect for embedding inline images, icons, and SVGs directly into HTML, CSS background properties, and JavaScript files.
  • Smart MIME Type Detection: Automatically detects and applies the correct MIME type (image/png, image/jpeg, image/svg+xml, etc.) for your resources.
  • API & Storage Friendly: Strip Data URL wrappers to extract pure Base64 strings for API payloads, JSON config files, and database storage.

How to Use

  1. 1.Paste your Data URL (with prefix) or pure Base64 string into the input box.
  2. 2.The tool automatically detects the format and converts it to the opposite type.
  3. 3.Review the result and verify that the MIME type (e.g., image/png) is correct.
  4. 4.One-click copy the converted string for your HTML, CSS, API, or database.

FAQ

What's the difference between Data URL and pure Base64?

A Data URL includes a MIME type prefix (e.g., 'data:image/png;base64,') which allows it to be used directly in HTML <img> tags or CSS properties. Pure Base64 is just the encoded string without the prefix, making it suitable for API transmission, JSON storage, and database records.

Can I use this to embed images directly into HTML and CSS?

Yes. Simply convert your pure Base64 string to a Data URL, and you can paste it directly into the 'src' attribute of an <img> tag or the 'background-image' property in CSS. This eliminates the need for external image files and reduces HTTP requests.

Does this tool support SVG and other MIME types?

Absolutely. Our tool supports all common MIME types including image/png, image/jpeg, image/gif, image/svg+xml, audio/mp3, and video/mp4. It automatically detects and applies the correct prefix for your specific file type.

Why would I need to remove the Data URL prefix?

Many REST APIs, WebSocket messages, and database systems expect pure Base64 strings without the 'data:image/...;base64,' wrapper. Removing the prefix is essential before sending image data to these endpoints to avoid formatting errors.