5 tools
PDF rendering library and command-line suite (pdftotext, pdfimages, pdftoppm, pdftocairo, pdftohtml, pdftops, pdfinfo, pdffonts, pdfdetach, pdfattach, pdfseparate, pdfunite, pdfsig) covering text/image extraction, page rendering, format conversion, metadata, attachments, and signature verification.
Command LinePDF viewer plus command-line tools (pdftotext, pdftops, pdftoppm, pdftopng, pdftohtml, pdfinfo, pdfimages, pdffonts, pdfdetach) for viewing PDFs and converting them to text, PostScript, image, or HTML, plus metadata, image, font, and attachment extraction.
GoGo PDF processor (CLI + library) supporting PDF up to 2.0 (ISO 32000-2): validate, optimize, split, trim, and merge PDFs; encrypt/decrypt; resize, rotate, and crop pages; extract/manipulate images, fonts, and metadata; manage attachments and portfolios; validate, report, and remove digital signatures; add/remove stamps and watermarks; process forms, bookmarks, and annotations; and generate booklets, N-up/N-down layouts, grids, and posters.
PerlPerl module (PDF 1.0–1.5) for reading and writing PDFs: extract/delete/duplicate pages, get page text/content trees, append/prepend pages from other PDFs, handle password-protected documents and permissions, list/add fonts, list/fill form fields, remove annotations, detect linearized PDFs, remove unused objects, and apply compression filters.
R bindings for extracting content from PDFs: `pdf_text()` for per-page text, `pdf_info()` for metadata (author, creation date, tags), `pdf_toc()` for table of contents/section headers, `pdf_fonts()` for font info, embedded-attachment access, and `pdf_render_page()` to rasterize pages to bitmap (e.g. PNG/WEBP). Does not handle table extraction (recommends the `tabulizer`/`tabulapdf` package) or OCR of scanned text (recommends the `tesseract` package).