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Every PDF API assumes a server with a headless browser. You can't run that in a V8 isolate. PDFops is the fill + merge primitive built for the edge: one HTTP call, deterministic bytes out, no native deps. Free tier, no signup.

pdfops.devPDFops — PDF fill & merge for the edgeDeterministic PDF write/merge from a single HTTP call. Runs on Cloudflare Workers, Vercel Edge, Deno, Bun.

GhostConvert

@ghostconvert.cc

Hard part isn't the edge — a PDF is objects + an xref table. Fill/merge renumbers objects and rewrites byte offsets or the xref breaks. 'Deterministic bytes' only hold if you re-emit the structure. AcroForm coords or flatten-to-overlay? GhostConvert.cc takes the same local-first angle.

13/7/26, 6:15 am0 reposts1 like

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