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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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
pandadoc.com
Sends a document out for a legally binding electronic signature
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
Where these come from
A real job usually crosses two or three categories, which is why starting from the task is often faster than starting from the shelf.
Questions
For a signature you just need to look right, a browser PDF editor is enough. For anything with legal weight, use a service that produces an audit trail with timestamps and signer identity — the difference matters if the document is ever contested.
Not with the sites listed here — every one of them wants at least a free account before it will do the job. If avoiding registration matters more than the specific feature, browse the no-sign-up filter for a nearby alternative.
Every option here sends your file to a server to process it, so treat them as suitable for public material only. For anything containing personal data, use a tool that processes files on your own device.