#490 · Developer Tool

Data URI Builder

Build a standards-shaped data URI from text, a chosen media type, and either percent or Base64 encoding, with size reporting and a browser preview link. Processing stays in the browser, so the input is not sent to a conversion service.

Developer Input

Text payload
Ad space

How to use this developer tool

  1. Paste text payload or load the sample.
  2. Choose any format-specific option shown above the run button.
  3. Select Build Data URI or press Ctrl/Cmd + Enter.
  4. Review the summary and download the result if it matches your target format.

What this developer tool does

It combines a media type, optional UTF-8 charset parameter, encoding marker, and payload into one self-contained URI.

Percent mode uses encodeURIComponent. Base64 mode first converts the text to UTF-8 bytes, then encodes those bytes.

Data URIs increase document size and are awkward to cache separately. Use them for small, stable assets.

Example

Input

<svg xmlns="http://www.w3.org/2000/svg" width="120" height="40"><text y="25">Hello</text></svg>

Run the included sample to see the exact output and byte statistics produced by the current options.

Use cases

  • Check values copied from email, URLs, tokens, or configuration files.
  • Prepare deterministic test fixtures without a server-side dependency.
  • Inspect byte-level transformations before adding them to application code.

Tips for reliable output

  • Keep the original input beside the result while debugging.
  • Confirm the alphabet or MIME variant expected by the receiving system.
  • Use hexadecimal output when bytes are not valid text.
  • Test Unicode and empty-edge cases in your own integration.
  • Do not treat reversible encoding as a security control.

Processing details

The media type is validated as a type/subtype token. A charset=UTF-8 parameter is added for text, XML, JSON, JavaScript, and SVG media types.

Browsers and applications may impose their own URL length limits. Never embed secrets in a data URI.

Frequently asked questions

What input does the Data URI Builder accept?

Text payload is accepted as plain text in the input area.

How does the Data URI Builder handle invalid data?

Browsers and applications may impose their own URL length limits. Never embed secrets in a data URI.

Is output from the Data URI Builder encrypted?

No. The transformation is an encoding or inspection operation, not encryption.

Can I use the Data URI Builder with Unicode text?

Yes. Text input is converted with UTF-8 where the format requires bytes.

What should I verify before using the result?

Data URIs increase document size and are awkward to cache separately. Use them for small, stable assets.

Format notes

PropertyValue
InputText payload
RunsLocally in the browser

Encoding and Decoding tools

Browse byte viewers, Unicode inspectors, and text encoding converters in the same category.

View category