Data URI Parser

About this tool

Paste a data: URI and see its MIME type, whether it is Base64-encoded, and the decoded text content (for text types).

Example

Input: data:text/plain;base64,SGk=

Output: MIME type: text/plain ... Content: Hi

Privacy

This tool runs entirely in your browser. Your data is processed locally and never uploaded to a server.

How to use this tool

1. Paste a complete data: URI into the input box.
2. Check the parsed MIME type shown by the tool.
3. See whether the URI is marked as Base64-encoded.
4. Read the decoded text content if the data contains plain text.

Step by step, what happens

1. The tool reads the data: URI and splits it into the header and the payload.
2. It identifies the MIME type from the header, or uses the default text/plain type when no type is provided.
3. It checks for the base64 flag so it knows whether to decode the payload as Base64 or as plain URL-encoded text.
4. It decodes the content and shows the readable text when the data represents text.
5. If the content is binary or not valid text, the tool still shows the metadata so you can inspect the URI safely.

Worked example

Here is a simple text data URI that contains the word Hello.

Input: data:text/plain,Hello

1. The tool parses the URI and finds the MIME type text/plain.
2. It sees that Base64 is not enabled, so it reads the payload as plain text.
3. It decodes the content and displays Hello as the text output.

Tips and common mistakes

• If you only see metadata and no decoded text, the URI may contain binary data or a non-text MIME type.
• Remember that a data URI can be plain text or Base64-encoded, and the tool will treat them differently.
• If the decoded text looks wrong, check whether the payload is actually URL-encoded or Base64-encoded.
• Make sure the string starts with data: and includes the comma that separates the header from the content.

Frequently asked questions