PDF4QT is an open source PDF editor for Windows and Linux under the LGPLv3 license. It offers applications for viewing, editing and rendering PDF documents, plus a C++ library and command line tool for developers. Features include digital signature verification, annotation editing and page organization such as merging and splitting.
wkhtmltopdf and wkhtmltoimage are open source command line tools that render HTML into PDF and image formats using the Qt WebKit rendering engine. They run headless without a display or display service. A C library, libwkhtmltox, offers bindings for PDF and image conversion.
Dangerzone is a free and open source project maintained by Freedom of the Press Foundation. It converts potentially dangerous PDFs, office documents, or images to a safe PDF. Documents are sanitized in a sandbox with no network access, and the document is converted into pixels and rebuilt as a PDF.
PDFEncrypt is a free, open-source native Windows app that encrypts PDF files using standard PDF encryption algorithms. Users specify a password required to open the document along with options and permissions for the PDF. Encryption runs locally on the Windows PC rather than uploading files to a third-party server. The app uses the iTextPDF library and is released under the AGPL license.
Double Commander is a free cross platform open source file manager with two panels side by side. It is inspired by Total Commander and includes an internal text editor, a file viewer for hex, binary or text formats, archive handling, extended search with full text search, and support for Total Commander plug-ins. It offers FTP, FTPS, FTPES, SSH+SCP and SFTP protocols support, a multi-rename tool and a tabbed interface.
itinypdf is a browser-based collection of PDF tools offered free with no watermark or account. It includes merging, compressing, splitting, converting, signing and editing PDFs, with tools for organizing pages, locking and unlocking files, and adding watermarks or page numbers. The site states that files stay on the user's device and are not uploaded to servers.
PDFCrowd provides APIs and integrations for converting HTML, URLs, and web pages to PDF. It offers an HTML to PDF API, WordPress plugin, WebSave as PDF, and automation integrations including Zapier and Make, along with free online tools. Documentation covers several document and image APIs and client libraries.
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wkhtmltopdf and wkhtmltoimage are open source command line tools that render HTML into PDF and image formats using the Qt WebKit rendering engine. They run headless without a display or display service. A C library, libwkhtmltox, offers bindings for PDF and image conversion.
Dangerzone is a free and open source project maintained by Freedom of the Press Foundation. It converts potentially dangerous PDFs, office documents, or images to a safe PDF. Documents are sanitized in a sandbox with no network access, and the document is converted into pixels and rebuilt as a PDF.
PDFEncrypt is a free, open-source native Windows app that encrypts PDF files using standard PDF encryption algorithms. Users specify a password required to open the document along with options and permissions for the PDF. Encryption runs locally on the Windows PC rather than uploading files to a third-party server. The app uses the iTextPDF library and is released under the AGPL license.
Double Commander is a free cross platform open source file manager with two panels side by side. It is inspired by Total Commander and includes an internal text editor, a file viewer for hex, binary or text formats, archive handling, extended search with full text search, and support for Total Commander plug-ins. It offers FTP, FTPS, FTPES, SSH+SCP and SFTP protocols support, a multi-rename tool and a tabbed interface.
itinypdf is a browser-based collection of PDF tools offered free with no watermark or account. It includes merging, compressing, splitting, converting, signing and editing PDFs, with tools for organizing pages, locking and unlocking files, and adding watermarks or page numbers. The site states that files stay on the user's device and are not uploaded to servers.
PDFCrowd provides APIs and integrations for converting HTML, URLs, and web pages to PDF. It offers an HTML to PDF API, WordPress plugin, WebSave as PDF, and automation integrations including Zapier and Make, along with free online tools. Documentation covers several document and image APIs and client libraries.
