Aspose.PDF FOSS

Aspose.PDF FOSS is a suite of open-source libraries for working with PDF documents at every stage of their lifecycle. The libraries support creating new documents from scratch, reading and editing existing files, splitting PDFs into individual page documents, and merging multiple PDFs into a single file. Encryption with AES-128, AES-256, and RC4-128 protects documents with user and owner passwords.

AcroForm handling covers the complete set of interactive form field types including text boxes, checkboxes, radio buttons, combo boxes, and button fields. Bookmark (outline) trees can be created and edited using all eight PDF destination types and named destinations. Annotation support spans text, link, highlight, freetext, circle, caret, file-attachment, and stamp annotations. Images can be embedded and extracted on a per-page basis. Tabular layout is provided through a nested table, row, and cell model with configurable borders, padding, alignment, and background fills.

Page rendering converts individual PDF pages to raster images in BMP, PNG, JPEG, TIFF, and GIF formats at a configurable DPI. Full-text search locates all occurrences of a query string across the document, returning matched text, page index, and bounding-box coordinates. Document metadata (title, author, subject, keywords, creator, producer, creation and modification dates) can be read and updated. Form flattening bakes all interactive field values into static page graphics, producing a non-editable copy.

Aspose.PDF FOSS is released under the MIT license with no runtime fees or usage restrictions. For the enterprise product family, see Aspose.PDF — Enterprise Product Family.