How Do You Get Multiple People to Sign One PDF?

What's the difference between sequential and parallel signing?

Sequential signing passes one file to each signer in turn, while parallel signing sends everyone their own copy to sign at the same time.

• Sequential: signer two only gets the file after signer one is done, so the file always carries every signature made so far.
• Parallel: everyone signs their own copy at once, which is faster, but someone then has to combine the marks into a single final file.
• Paid signing platforms offer a hybrid of the two, grouping some signers together and others in order, according to Adobe Acrobat Sign's own help pages.
• A free tool like Sign PDF doesn't route the file for you. You choose sequential or parallel, and you handle sending it yourself.

How do I set up a PDF so several people can sign their own part?

Give each signer their own labelled spot before anyone signs, so the file stays clear through every round.

• Open the document in PDF Forms and add a text box or line for each signer's name, date and signature, labelled "Signer 1", "Signer 2" and so on.
• On a document with no spare space, add a short signature page at the end with one row per person instead of squeezing marks onto the main pages.
• Save this version as the master copy before it goes to anyone, so you always have a clean, unsigned file to restart from if something goes wrong.

How does each signer actually add their signature?

Each person opens the same PDF in Sign PDF and adds their own signature the same way, then passes the file on.

• Open Sign PDF, click Open Sign, and make a signature by typing a name, drawing it, or uploading a photo of a signature on paper.
• Click the labelled spot for that signer, drag it into place if needed, and save the file.
• Rename the saved copy to show who just signed, for example "lease-signed-maria.pdf", and send it to the next person on the list.
• For parallel signing, send the unsigned master to everyone at once instead, and collect every signed copy back before deciding how to combine them.

Is a PDF with several people's signatures legally binding?

Yes, in the US and EU, a typed or drawn signature from more than one person on a PDF is valid for most everyday contracts.

• The US ESIGN Act, in force since 2000 and codified at 15 U.S.C. Section 7001(a), says a signature or contract can't be denied legal effect just because it's electronic.
• The EU's eIDAS Regulation, 910/2014, says the same in Article 25: an electronic signature can't be refused as evidence purely for being electronic.
• What doesn't change with more signers: a drawn or typed signature shows who signed but doesn't cryptographically prove it. Wills, deeds and some court filings often need more.
• For the fuller picture on what counts as binding, see Is a PDF Signature Legally Binding?.

How do I stop a multi-signer PDF from getting messy?

Track each round by file name, and lock the finished file once every signature is in.

• Name every copy with the round and the signer, so you can tell at a glance who still needs to sign.
• Open each returned copy and check the labelled spots before sending it to the next person, so a missed signature doesn't travel further down the chain.
• Once everyone has signed, run the final file through Flatten PDF. This merges every signature into the page itself, so later edits can't move or delete one quietly.

Try the tools

Try it on your own file. The tools are free and you don't need an account.