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Playground demo key · api.reefapi.com
post/file-convert/v1/pdf_merge1 credit

Merge 2-20 PDFs into one (input order preserved). 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

Array of base64 files (max 20 total inputs). Combine freely with file_urls; base64 entries come first in the processing order.

Array of https URLs (each SSRF-guarded and fetched server-side).

Password for encrypted PDFs. Without it an encrypted input fails cleanly with INVALID_PARAM (we never crack/bypass).

request preview
curl -X POST https://api.reefapi.com/file-convert/v1/pdf_merge \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"files_b64":"[\"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\",\"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\"]"}'

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