Adobe Acrobat online
acrobat.adobe.com
Adobe's own PDF tools, free for about a job at a time
Free tier
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Merge, split, sign, compress and repair PDFs in a tab.
acrobat.adobe.com
Adobe's own PDF tools, free for about a job at a time
dochub.com
Fills in a PDF form and signs it without printing anything
draftable.com
Shows exactly what changed between two versions of a document
ilovepdf.com
Merge, split, compress, unlock and convert PDFs from one toolbar
ocr.space
Pulls the text out of a scan or screenshot with no sign-up
overleaf.com
Write LaTeX in a browser and watch the typeset PDF update beside it
tools.pdf24.org
Around thirty free PDF tools with no account and no daily counter
pdfescape.com
The 2007 browser PDF editor that still fills awkward government forms
sejda.com
Actually edits the text inside a PDF, not just annotations on top
smallpdf.com
The tidiest PDF suite, rationed to a couple of jobs a day
stirlingpdf.io
Fifty PDF tools you can also run on your own machine in Docker
xodo.com
Reads and annotates a PDF properly, then merges or converts it
By task
Questions
There is no single answer, which is why this page lists 12 of them with their limits stated. If you want to avoid signing up entirely, 3 of these work with no account at all.
Every site in this category sends your input to its own server to do the work. That is fine for public material; for anything containing personal data, check the on-device collection instead.
Nothing in this category has shut down so far. When something does, it moves to the Archive with a named successor rather than being deleted, so the answer to "what replaced it" survives.