How to edit a PDF as vector artwork
Open a PDF in Vectornation by Zaweba to get real vector shapes, with text as outlines or editable text, layers, clipping and images kept.

Open the PDF in Vectornation by Zaweba and its contents come in as real vector artwork, not a flattened image. Shapes arrive as paths you can reshape and recolour, text arrives either as outlines or as editable text, and clipping, transparency, images and layers are kept. You can then save it back as a PDF, or as any of the other formats Vectornation writes.
Vectornation by Zaweba is a free vector editor for Windows. It runs offline with no account, which matters when the PDF is a client's artwork you would rather not upload anywhere.
What you get when a PDF opens
Most PDFs made by design software are vector files underneath. A logo, a poster or a technical drawing exported to PDF still holds the paths and fills it was drawn with. Vectornation reads those and rebuilds them as objects in a normal document, so the Selection tool picks out individual shapes and the Layers panel shows the structure.
Text is where you make a choice. By default it comes in as outlines, which keeps the look exact even if you don't have the font. If you need to change the wording, open it as editable text instead; then the letters stay as type and the font manager shows whether the font is on your PC. Password protected PDFs open too, once you give the password.
Images inside the PDF stay as images. Clipping paths that crop them remain as clipping, so you can move the picture within its frame rather than finding it has been cut to size permanently.
Making the edits
Once the file is open, treat it like any drawing. Use the selection tools and the pen to reshape paths, the Pathfinder and Shape builder to combine pieces, and the Appearance panel to change fills and strokes. When the same colour or stroke weight runs through the whole file, Edit > Find and replace attributes changes every instance in one go, which is far quicker than clicking each shape. It swaps fonts in the same way.
PDFs exported from other programs often arrive with a lot of grouping and clipping that served the old program but gets in your way. Release groups as you go, and look in the Layers panel when a click selects something unexpected. A full page rectangle sitting at the back is a common culprit.
If you only need part of the PDF, such as a logo on a letterhead, select it, copy it, and paste it into a new document. Or use Place to bring the whole PDF into an existing drawing as one piece.
Saving the result
For print, save as PDF, or as PDF/X-4 when the printer asks for it. PDF/X-4 export in Vectornation can add bleed and printer's marks. For screens, export SVG or a picture format such as PNG or WebP. If the file came to you as an Illustrator .ai, Vectornation can save a PDF compatible .ai back, and EPS is there for older workflows.
Keep the native .vecz copy as your working file. It is compressed SVG and holds everything as you left it.
When a PDF is not really vector
Some PDFs are scans. A scanned page is a single photograph inside a PDF wrapper, and no vector editor can turn it into separate shapes simply by opening it. If you open a PDF and find one big image, use Vectornation's Image Trace on that image to rebuild it as shapes, or ask for the original artwork.
A PDF is often the only version of a design anyone can find, so being able to open it as editable artwork is a quiet lifesaver. Vectornation by Zaweba makes that a matter of File > Open.