placeholders.dev

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llms.txt

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1. explain_placeholder_image_urlReads only

   Break an existing placeholders.dev URL into the options it actually uses, filling in the defaults the image API would apply and listing any query parameters it ignores. Useful before editing placeholder URLs already in a codebase.

   First seen 11 Oct 2026. Unchanged since.

2. generate_placeholder_image_urlDoes not say

   Build a placeholders.dev image URL from a description of the placeholder wanted, such as "1200x630 dark social share image saying Hello World". Returns the URL plus ready-to-paste HTML and Markdown, and shows a preview on the page. Every value is validated the way the image API validates it, so an unusable color or font stack is reported rather than silently ignored.

   First seen 11 Oct 2026. Unchanged since.

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