Almost every tool in this category can put a mark on a page. The interesting questions start immediately afterward — what was recorded, who else has to sign, what the recipient is made to do, and what file you are holding when it is over.
What we cover
The subject is narrow on purpose: PDF signing and electronic signature software. That includes the desktop readers and operating system features people already have, the free web tools they reach for once a year, and the dedicated signature platforms built for sending documents out to other people.
Within that, the comparisons keep returning to the same handful of questions. How is the signature made — drawn, typed, or backed by a certificate? What is captured alongside it, and can you export that record? How does requesting a signature from someone else work, and what does that person have to install or register for? What is signing like on a phone, where most of it now happens? And when the last person has signed, what is the resulting artifact — a flattened PDF, a signed PDF, or a link to a copy someone else is hosting?
Those questions come up on every page because they are the ones that separate tools that look identical in a feature table.
How the comparisons are written
Each write-up starts with a job rather than a product: sign a single page and email it back, collect four signatures in a fixed order, countersign something a client sent over. The job decides what is worth reporting. A tool that is clumsy for a twelve-signer contract may be the best thing available for a one-page release form, and a comparison that hides that is not much use.
From there, each comparison keeps returning to the same practical questions: how the signature is made, where an account is quietly required, what the person on the receiving end has to do — recipients are where signature requests most often stall — and what file you are actually left holding once everyone has signed. The write-ups are grounded in each tool's own documentation, its published pricing and limits, and the parts of the workflow that are visible to anyone who uses it. Where something can only be confirmed by the vendor, we say so rather than assert it.
What you will not find here
There are no scores, star ratings, tiers, or leaderboards on this site, and there will not be. A single number would have to average away the differences the whole site exists to record. We also do not publish testimonials, user counts, or awards. Where we recommend something, it is a sentence explaining who it suits and who it does not.
On legal validity
Nothing published here is legal advice, and none of it should be read as a ruling on whether a particular signature satisfies a particular requirement. Those requirements vary by country, by industry, and by document type, and they change. What we can do is describe how a tool handles identity evidence, consent, tamper-evidence, and record retention, and flag the questions worth putting to a qualified adviser before you rely on a signature for something consequential.
Corrections
Signing software changes often — pricing tiers move, free request limits shift, apps get rebuilt. If something here is out of date or simply wrong, write to [email protected] and say what and where. Corrections are made to the page itself rather than appended somewhere quieter.
How the site is funded
PDF Sign Compare is an affiliate-supported publication. Some links to the products we write about are affiliate links, which means we may earn a commission if you sign up or subscribe after following one. It costs you nothing extra, and it is the only way the site is paid for.
That arrangement does not buy anything editorial. No vendor pays for inclusion, placement, wording, or a preview of a comparison before it publishes, and tools without any affiliate arrangement — including free ones and features already built into software you own — are covered and recommended on the same terms as everything else. Where a free option is genuinely enough for the job, we say so, even though saying so earns nothing.
Get in touch
Questions, corrections, and suggestions for what to compare next all go to the same place: [email protected].