Custom text can appear in URLs, browser history, CDN logs, and application logs. Do not place secrets, tokens, regulated data, or private customer information in fallback image URLs.
Website pages may use Google Analytics when a measurement ID is configured, and the image API can send server-side aggregate request events for direct Worker URL calls. API analytics strip query strings before sending URL metadata, so custom text= values are not forwarded to Google Analytics.
For enterprise privacy, security, or data-processing questions, review the API Reference, Status, and GitHub, or contact support@fallback.pics.