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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dochub.com
Fills in a PDF form and signs it without printing anything.
Open a PDF, type into the fields, drop in a drawn or typed signature, and send it on for someone else to sign. It connects to Gmail and Google Drive, which is what makes it stick — the signed copy lands back where the original came from. It produces a signature that looks right rather than a legally audited e-signature with an identity trail.
Questions
Free to use, but you have to register before it will do the job. You must register before the first document, and the free plan caps how many documents you can sign or send each month.
Yes. DocHub sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
You must register before the first document, and the free plan caps how many documents you can sign or send each month.
Alternatives
Same category or same task, ordered by how closely they overlap.
acrobat.adobe.com
Adobe's own PDF tools, free for about a job at a time
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