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Responsive Picture Markup Builder

Generate a responsive picture element with explicit fallback and dimension attributes.

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Three steps. That’s it.

A useful toolkit for text, data, images and calculations.

  1. 01

    Add your input

    Choose a tool, enter values or select a file.

  2. 02

    Make it yours

    Adjust the options and run the action.

  3. 03

    Take the result

    Copy the result or download its file.

Responsive Picture Markup Generator online

Generate a responsive picture element with explicit fallback and dimension attributes. Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

How to use it

Paste JSON matching the structure in the example. Choose Run tool. Review the output, then copy or download it.

Worked examples

Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

Reproducible worked example

Settings: No additional settings.

Input:

{"small":"/images/photo-640.webp","large":"/images/photo-1280.webp","fallback":"/images/photo.jpg","alt":"Office workspace","width":1280,"height":720}

With the input and settings above, the tool produces:

Output:

<picture>
  <source type="image/webp" srcset="/images/photo-640.webp 640w, /images/photo-1280.webp 1280w" sizes="(max-width: 640px) 100vw, 1280px">
  <img src="/images/photo.jpg" alt="Office workspace" width="1280" height="720" loading="lazy" decoding="async">
</picture>

The example output has 4 lines. Compare its order, separators and whitespace with the input before copying the result.

Limitations and common mistakes

  • Only generates markup; referenced files must exist. Adjust intrinsic widths and sizes to match the actual images and layout.
  • Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The worked example shows the supported structure and actual output.

How can I create a responsive picture element with explicit fallback and dimension attributes online?

Paste JSON matching the structure in the example. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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