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Playground demo key · api.reefapi.com

post/email-preflight/v1/preview_basic3 credits

Basic visual preview: render the HTML to a PNG via web-capture's browser sandbox. HONEST: a browser render, NOT a real email-client render (no Outlook/Word engine). Degrades gracefully if web-capture is not deployed.

Working example

Parameters

htmlrequired

The full HTML of the email you are about to send (paste the source). Parsed read-only in a no-network, no-script sandbox.

widthoptional

Viewport width in px (typical email width = 600). (320–1200)

request preview

curl -X POST https://api.reefapi.com/email-preflight/v1/preview_basic \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"html":"<h1>hi</h1>"}'

Hit Send to run this endpoint live.