Cloudflare Media Transformations — Test Page

Deploy this page to Cloudflare Pages to get a free .pages.dev domain. Then enable Media Transformations for that zone and build thumbnail URLs like:

Pattern:

https://<your-project>.pages.dev/cdn-cgi/media/mode=frame,time=1s,height=360/<FULL_R2_VIDEO_URL>

Example:
https://your-project.pages.dev/cdn-cgi/media/mode=frame,time=1s,height=360/https://pub-XXXX.r2.dev/video.mp4

Health Check

If you can see this page after deploying to Pages, your zone is ready. Next, in Cloudflare Dashboard, enable Transformations for the .pages.dev zone and allow sources like *.r2.dev.