Limits & expectations

WebToBook turns a public web page into a print-style PDF. BookToWeb turns a PDF or DRM-free EPUB into a simple site you can deploy. Below are the technical ceilings the app enforces today. For deploy env vars, see our deployment guide and repo docs/LIMITS.md.

WebToBook (URL → PDF)

• Fetched HTML body: up to 5 MB; timeout 30 s; up to 5 redirects.
• Only http/https; private and loopback hosts are blocked (SSRF protection).
• HTML passed to the PDF engine: up to 10 MB.
• PDF rendering: PDFShift when PDFSHIFT_API_KEY is set; otherwise (or on failure) headless Chromium on the server.

BookToWeb (upload → site)

• Vercel request payload hard cap: 4.5 MB (includes base64 overhead).
• Default max decoded file size: 3 MB (MAX_PDF_SIZE_MB); increase only if your host allows larger requests.
• Accepted types: PDF or DRM-free EPUB.

Content & rights

You must have the right to fetch or upload the content you convert. We do not bypass paywalls, logins, or anti-bot pages. Outcomes (SEO, discoverability, lead capture) depend on your content and how you ship the generated site—not on magic guarantees.