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veraPDF – industry supported PDF/A validation

veraPDF is a purpose-built, open source, file-format validator covering all PDF/A and PDF/UA parts and conformance levels.

PDF4QT is a cross-platform PDF editor consisting of four applications.

PDF Metadata Editor is a simple tool you can use to edit the metadata (Author, Keywords, etc.) of a PDF document.

Scans to PDF lets you create small, searchable PDFs from scanned documents.

Pulsar is a community-led hyper-hackable Text Editor. It’s forked from the abandoned Atom text editor. It’s built on Electron.

unlockR is a simple tool to decrypt PDF files. It offers a GUI using GTK4.

jpeg2pdf is a command-line tool which lets you convert images to PDF. It supports a variety of different image formats.

PdfJumbler is a simple tool to rearrange, merge, delete, and rotate pages from PDF files.

pdfposter can be used to create a large poster by building it from multiple pages and/or printing it on large media.

The PDF file format is one of the most common file formats in use today. This article recommends the best open source PDF viewers.