TCPDF is now one of the world's most active open-source projects, used daily by millions of users and included in thousands of CMS and web applications. No external libraries are required for the basic functions, all standard page formats, custom page formats, custom margins, and units of measure. UTF-8 Unicode and right-to-left languages. TrueType Unicode, OpenType Unicode, TrueType, OpenType, Type1 and CID-0 fonts, and font subsetting. Methods to publish some XHTML + CSS code, Javascript, and forms. Images, graphics (geometric figures), and transformation methods. Supports JPEG, PNG, and SVG images natively, all images supported by GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM), and all images supported via ImagMagick. Automatic page header and footer management. Document encryption up to 256-bit and digital signature certifications, transactions to UNDO commands, and PDF annotations, including links, text and file attachments.