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You can use Adobe Acrobat to make an existing PDF document signable.
- Open the PDF you need to make signable with Adobe Acrobat.
- Click on the "Tools" tab, highlighted below.
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- Scroll down and select "Prepare Form" under the "Forms & Signatures" section, as highlighted below.
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- Make sure the correct file is selected, and check the checkbox next to "This document requires signatures", as highlighted below.
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- Insert a textbox where the signature will go. You can rename the textbox to "Signature".
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- Save the document and close the editor options.
- Click "Fill & Sign" in the right hand toolbar.
- Choose whether you will be signing the document, or if you will be sending the document to others to be signed.
- If you select the "Me" option, click the "Sign" button at the top of the document.
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- You can choose to type your signature, draw it, or upload a picture of it. Once you have your signature ready, you can click "Apply".
- Your signature will float under your mouse. Move the signature to the signature box and click to apply it.
- Save the document.
More help can be found on Adobe's website at: https://acrobat.adobe.com/us/en/acrobat/how-to/create-fillable-pdf-forms-creator.html