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How to edit PDFs with free open source software

PDFs are made for faithful viewing, not editing; text and images are flattened and hard to change. You can use LibreOffice Draw to replace images, edit text, annotate ...
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I trust these open-source apps for all my PDF editing

Upgrade your suite of PDF tools.
The Star

For a better way to edit PDFs, use Libreoffice's hidden gem, Draw

Libreoffice is a versatile software suite that has made a name for itself as a free and open source alternative to Microsoft Office. — Robert Guenther/dpa Writing text, creating a presentation, ...