How to Pre-specify a Filename for a data: URI Download?

How to Specify a Suggested Filename When Using data: URI

Question:

When a data: URI is clicked, the browser prompts the user to download a file with the data encoded in base64. Is there a way to pre-specify a default filename for the downloaded file?

Answer:

Using the download Attribute:

Use the download attribute in the tag:

<a download='FileName' href='data:application/octet-stream;base64,SGVsbG8='>

Availability:

• Chrome
• Firefox
• Edge
• Opera
• Desktop Safari 10
• iOS Safari 13

Note:

The download attribute is not supported in IE11.

Additional Information:

• The download attribute is a suggested filename and may be overridden by the user.
• The filename should include the file extension, such as .txt, .pdf, or .png.
• The [href](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-href) attribute must be a valid data: URI.

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