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Playground demo key · api.reefapi.com
post/file-convert/v1/image_thumbnail1 credit

Fast thumbnail (16-2048px box; square=true centre-crops to a square). Output delivery: each produced file ≤10MB comes inline as base64 (files[].file_b64); 10-50MB comes as a one-time download token (files[].download_path, 30min TTL); >50MB total is rejected.

Working example
Parameters
No parameters — just send.
request preview
curl -X POST https://api.reefapi.com/file-convert/v1/image_thumbnail \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"file_b64":"iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAIAAABvFaqvAAAAH0lEQVR42mN4l+VFFcQwatCoQaMGjRo0atCoQQNvEAB6hKyuf+L5NQAAAABJRU5ErkJggg==","size":"64"}'

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