Blob ↔ DataURL Converter

Upload an image to get both its Blob URL and Base64 DataURL at once. Copy either one with a single click for embedding or debugging image resources in your code.

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Drop an image or click to upload

PNG, JPG, WEBP, BMP

What Are Blob and DataURL?

A Blob URL is a temporary address starting with blob: that points to a file object in the browser's memory, commonly used for front-end image previews and uploads.

A DataURL encodes a file as a Base64 string that can be embedded directly in img tags, CSS backgrounds, or JSON data.

How to Use

Convert in two steps:

  • Upload an image.
  • Copy the Blob URL or DataURL into your code.

Tips

  • Small icons are great candidates for inline DataURLs; use separate files for large images.
  • Blob URLs can be used in img tags, video sources, or fetch downloads.
  • To get the Base64 of other file types, pair this with the Base64 Encoder/Decoder tool.

Frequently Asked Questions

What's the difference between Blob URL and DataURL?+
A Blob URL (starting with blob:) points to an object in the browser's memory and is great for in-page use. A DataURL is a Base64-encoded string that can be embedded directly into HTML/CSS, making it easy to share and store.
Can a Blob URL be used long term?+
No. A Blob URL is only valid within the current page session and becomes invalid after a refresh or when the page is closed.
Are there any downsides to DataURL?+
Base64 encoding increases the size by about 33% and is not ideal for large images, but it's convenient for embedding directly in code.
Is my image uploaded to a server?+
No. The conversion happens entirely locally in your browser.

Related Tools

Image to Base64Base64 Encoder/DecoderBase64 to Image

Blob ↔ DataURL Converter — free online blob url, dataurl, base64 image, image to base64, blob dataurl. No signup required. Works in your browser.