Best PDF Merge Software for JavaScript

pdfRest is a REST API for high-volume PDF processing, built on the Adobe PDF Library. Call it from any language to convert, generate, extract, secure, and prepare PDFs in production pipelines, chaining calls by passing a resource ID between steps. Convert Office, HTML, images, email, and Markdown to PDF, and PDF to Word, Excel, PowerPoint, images, Markdown, PDF/A, PDF/X, and PostScript. Generate PDFs from scratch with text, images, shapes, and attachments, with accessibility tagging. Extract via OCR, text/image extraction, form data, metadata, AI summarization, translation. Secure with signing, encryption, restrictions, watermarking, two-step redaction, and TDM Reserve to opt out of AI training. Handle prepress: color conversion, transparency flattening, page boxes, rasterization. Manage forms: import/export, flatten, XFA-to-AcroForm. Deploy on pdfRest Cloud (US or EU) or self-host via Docker, Kubernetes, or AWS Marketplace (BYOL) — same API, same code, just change the base URL.