Navigate to docs.google.com and click the folder icon in the top right corner. To allow others to sign using a certificate in Reader 11.0.6 or earlier, the PDF needs to … After installing the app, you can open PDF documents in the app and tap the signature button to sign them. How to add a signature to PDF files for Foxit Reader users:. Select Open from the Certificates dropdown menu. The CAC card stores your digital id on an embedded microprocessor chip. 4. A Digital ID certificate is required to create a digital signature. Since we launched in 2006, our articles have been read more than 1 billion times. For example, you can type text or add checkmarks to fill in forms using buttons on the Fill & Sign toolbar. By submitting your email, you agree to the Terms of Use and Privacy Policy. You can type an email message and then send the signed document. Step 2: Under “Fill and Sign” option, just click on the “Place Signature” option. Click on … I want to scan documents and add a place for some one to sign. Use the digital ID on a smart card to sign and decrypt documents on computers that can be connected to a smart card reader. A menu bar will open up with the options – ‘Digitally Sign’, ‘Time Stamp’, and ‘Validate All Signatures’. Test your digital signature with the Portable Document Format - Fillable (PDF-F) link: PDF-F . So sure, the below methods aren’t perfectly secure—but neither is printing something, scribbling over it with a pen, and then scanning it again. Sorry for the delayed response and inconvenience caused. When a signer clicks on the field, a dialog opens and prompts them to certify or digitally sign the file with their digital ID. All Rights Reserved. Select the PDF document you want to fill in and sign. We like HelloSign, which offers a good web interface as well as a Chrome app that integrates with Google Drive. The problem is we don’t live near each other and don’t have printers/scanners. For many businesses, simply accepting signed documents by email rather than forcing you to fax them is a huge technological leap. If you don’t like HelloSign, DocuSign works well on a Chromebook too, offering an app that integrates with Google Drive for signing and a browser extension that allows you to sign documents from Gmail. To get a PDF document from another app into Adobe Fill & Sign, find the PDF file in another app, tap the “Share” button, and choose the Adobe Fill & Sign app. You could potentially just capture a photo of it with your webcam or smartphone’s camera, too. As per the description above, you want to sign a PDF using your CAC card, Is that correct? We’ll show you how to quickly add your signature to any PDF document, saving it as a standard PDF file that can be read anywhere. You can do this on Windows, Mac, iPad, iPhone, Android, Chrome OS, Linux—whatever platform you prefer. Check the box to Lock Document After Signing ; Click Sign; Save the PDF & enter the password for your Certificate/USB token. The file is located on a shared drive. It works very well and allows you to sign documents with your finger. Follow these easy steps to fill in a form online and add your e-signature: Click the Select a file button above, or drag and drop a file into the drop zone. ~+�Y��٧�3���hpl�?> n����,��*�a�O��(��h���ȸXsv��/��1��?Ƿ�sx�����|XD��ߏ`!Z�إ��:��u����Fvi��B%��Lo��e��H�>[�Jb��[�y��FA��Ŗ;�� ��\��su>a��4J�Ϗ�qY$�`���>�n �L��d���*�w� ~ ��/�. So I quickly had to figure out how to digitally sign a PDF without running down to FedEx. Click on the “Certificates” Icon in the lower right hand corner. There are a couple of easy ways to digitally sign a PDF for free, here are two of them. Click "Sign" and then your signature will be added to the PDF file. You can sign a document by writing on your touch screen with a finger or stylus, and they also allow you to type text into PDF documents to fill them in. Prior to uninstalling the software, you should save the forms to PDF. Sign your PDF document with a digital signature according to the protocols of Public Key Infrastructure (PKI). Steps to add a digital signature in PDF: Step 1: First, open the PDF file which you want to add a signature and then go to “Fill and Sign” section, as shown in the image below. For more … On the Forms tab, in the Form Fields group, click Digital Signature. While Adobe Reader isn’t the most lightweight PDF viewer, it is one of the most feature-packed, and actually has excellent support for signing PDF documents. It's signed with a digital certificate on Adobe Pro. RELATED: How to Sign Documents and Mark Up Attachments in iOS Mail. Click the toolbox-shaped “Show Markup Toolbar” button, and then click the “Sign” button on the toolbar that appears. Digital signing of documents and email is the best way to ensure that the digital media remains intact, protecting the overall integrity of the document or email. If you don't have the full Adobe software consider a PDF printer like DoPDF. To sign a document, you must first have a digital ID. (Optional) If you want to include an image of your handwritten signature in the certificate-based signature, scan your signature, and save it as an image file. Click the signature to check its status. How to sign a PDF document online: Upload your PDF to our eSign PDF tool. Other third-party PDF readers may offer this feature, but they generally require you purchase a paid version before using their signature features. I have attached the document properties page. In versions prior to V10,the PDF sign signature need to be selelcted or created under PDF Sign tab and the PDF Sign tab doesn't always show up in Foxit PhantomPDF, it only appears after you click on Protect tab>PDF Sign. 2. Can SECURED documents be signed? On a Chromebook, you’ll find a variety of web signing services that work for you. You’ll then be able to add a signature by tapping the signature button at the bottom right corner of your screen. When you tap “Done”, the Mail app will automatically create a reply to the email with your signed document attached. To save your signed PDF document, click File > Save and select a location for the file. The CAC card stores your digital id on an embedded microprocessor chip. This feature is convenient, but it only works if you want to sign documents in the Mail app. A dialog box with five options will open: Draw Signature allows you to draw the signature using your mouse or touchpad. Download links are given below. Click on “Digitally Sign” in the certificates ribbon at the top. Your own digital signature and the PDF document you sign are encrypted together and bound with a tamper-evident seal. How to Electronically Sign PDF Documents Without Printing and Scanning Them, sign documents using the markup feature in the iOS Mail app, a Chrome app that integrates with Google Drive, a browser extension that allows you to sign documents from Gmail, How to Customize the Workout Stats You See on a Apple Watch, How to Rotate Text in Microsoft PowerPoint, How to Disable Siri Suggestions in Spotlight Search on iPhone and iPad, How to Stream the 2021 Rose Parade’s New Year Celebration. Digital Signature. You can then tap the signature button to easily sign the document. First, you’ll need to create an image of your signature—sign a piece of paper, scan it into your Linux system, and clean it up. The form is currently unsigned. For example, you may be emailed a PDF document and you may need to sign it and email it right back. Just like on the iPhone and iPad, we like Adobe Fill & Sign, which allows you to sign an unlimited number of documents a month for free. To share the form, click Next and follow the instructions. Windows: Open the PDF in Adobe Reader and click … Digital signatures also allow you to design a signature, or multiple signatures, for different types of documents. I also have the Adobe Pro, but I'm not able to sign from my end - also using digital sign / certificate option with Adobe Pro - the option is simply disable, I don't know what to do. Additionally, whoever is receiving the … Install Xournal from your Linux distribution’s software installation tool, open the PDF, and click the Tools > Image menu option. Click on the “Click to digitally sign” button in the document to sign. It’s unique to you. You now have digitally signed a PDF document using Foxit Reader. Once you’ve captured a signature, you can select it in the menu that appears after you click the “Sign” button. Your signature is applied as an image that can be dragged around and resized to fit the document. Sign PDF with Digital Signature (Optional) To digitally sign a PDF, you need to navigate to the "Protect" tab and click "Sign Document". To sign a PDF document or form, you can type, draw, or insert an image of your handwritten signature. You can then share the signed document with another app by tapping the “Share” button. Open the Foxit Reader in your PC, then click the File menu > Open > Computer > Browse then select the PDF file you wish to sign. How to Digitally Sign a PDF. On an iPhone or iPad, you can sign documents using the markup feature in the iOS Mail app. If you don't have a digital ID, create one with your name or email address. Mac users are luckier than Windows users. Microsoft Office digital signature provides users with ability to verify a document’s integrity. Signing, Encrypting and reading will vary depending on the applications that are involved. In the Windows 10 Fall Creators Update, Microsoft Edge makes it possible for you to fill and sign PDF documents electronically. When you are finished, it will lead you back to "Sign Document" with your ID info displayed in the box. When you save the document, the signature and text become part of the PDF. Together we both had to digitally sign a couple of PDFs. If you have a program/software which can edit PDF files like Microsoft Word or Adobe Reader, you can right-click the file and it will give you an option to open the file using a different program. Send files to other signers to collect their digital signature using Adobe Sign, save signatures, edit PDFs with PDF editor tools, create and preview fillable PDF forms, merge files, annotate files, add watermarks, convert PDFs, and convert files to and from PDF, including Microsoft Excel, PowerPoint, and Word documents. If you need to add other information to the document, you can use the other buttons on the toolbar to do so. First, let’s straighten out some terminology. Chris has written for The New York Times, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. The other options on the toolbar allow you to type text and draw shapes on the document, allowing you to fill in forms, if necessary. You’ve been emailed a document, and you have to sign it and send it back. To check if the signature has been successfully applied, open the PDF document and you will see the signature as shown below. A toolbar will appear in the upper part of the program window. Open the respective file on the Adobe Reader Click on the ‘Tool’ tab located on the top menu bar. According to other information I have read, the ability to sign using older versions of Reader require the PDF to be saved as a Reader Extended PDF with the Enable More Tools option. Shares. To create a new digital signature form field: 1. To digitally sign a PDF: On the Protect tab, in the Certify Document group, click the arrow under Sign, and select a signature from the gallery. If you have any digital signature with you, then you can directly click on the “Sign in” button or else … Select Sign Document from the right-click menu. The ‘Add’ file feature under attachments is greyed out. © 2021 LifeSavvy Media. As you can tell I don’t use paper very often anymore. Steps to digitally sign Word document. To digitally sign a PDF, you need to navigate to the "Protect" tab and click "Sign Document". Click the Sign icon in the Fill & Sign toolbar, and then choose whether … By default, Adobe Reader selects “Type” so you can type your name and have it converted to a signature. When you’re done, click File > Save to save the PDF, applying your signature to the file. You can also add text, such as your name, company, title, or the date. Click the signature field to bring up the Sign Document window. ... Luckily for you, there’s a simple and easy solution to get your documents from point A to point B: Digital signatures. The document now has its final signature in place. Then click “Apply” to place your signature on the form. Electronic Signatures, Not Digital Signatures. It can annotate PDFs, adding images to them. Leave “Save Signature” checked and you can quickly add this signature in the future. Having to actually scan and create an image file is a little bit annoying, but you can use this method to quickly sign documents in the future after you’ve gotten a good image of your signature. RELATED: The Best PDF Readers for Windows. 1. When you save the document, the signature and text become part of the PDF. Step 1: Place your pointer in the location in your document where you … Drag your signature box where you want to sign 3. It’s very secure, but also complicated. It allows you to sign up to three documents a month for free. Instead, you’ll need to use a third-party app. To sign a PDF form, you can type, draw, or insert an image of your handwritten signature or initials. You can also add text, such as your name, company, title, or the date. The first option you have is to use the free version of Adobe Acrobat Reader DC. How-To Geek is where you turn when you want experts to explain technology. To sign a document, open a PDF document in Preview (this should be the default app that opens when you double-click on a PDF file, unless you’ve changed it). You can sign up to five document a month for free, but after that it requires a monthly subscription fee. Thanks to the excellent trackpads built into MacBooks, you can actually draw your signature on the trackpad with one of your fingers to enter it into Preview. To check if the signature has been successfully applied, open the PDF document and you will see the signature as shown below. You can also type text and draw on the document, if you like. Launch Adobe Acrobat. Use Microsoft Edge on Windows 10 to Esign a PDF. I have a PDF document that others in my office are able to sign, and I was able to sign using another vendor's PDF software. Click on the “Certificates” Icon in the lower right hand corner. Join 350,000 subscribers and get a daily digest of news, geek trivia, and our feature articles. Open the PDF document or form in Acrobat or Reader, and click Fill & Sign in the right pane. This tutorial will show you step by step how to electronically fill in and sign PDF forms and documents without printing and scanning them. Capture your signature once and Preview will remember it for the future. Right-click in the PDF document where you want to add the Digital signature. I have a user who has received a SECURED document. If you want to do this from any other app, you’ll need a third-party signing app. The signature field lets you add an empty digital signature form field to a document. Hello Radhakrishnan T,. Step 3: If you have a digital ID with info displayed on the box, click on “Sign” and your PDF file will be signed digitally. Since 2011, Chris has written over 2,000 articles that have been read more than 500 million times---and that's just here at How-To Geek. Sign a PDF To sign a PDF document or form, you can type, draw, or insert an image of your handwritten signature. Click the signature to check its status. Additional information (eg: date or place) can be added. This is an Adobe safeguard to protect the PDF file. To do this, you’ll need to receive an email with a PDF file attached, tap the PDF attachment, and click the toolbox-shaped “Markup and Reply” icon at the bottom right corner of the screen while viewing the PDF. You can then email the signed document directly to someone or download the document and do whatever you want with it. Our free online signature software doesn't just allow you to sign PDF online, you can also fill out your forms online by adding text, selecting checkboxes, inserting the current date, initialing where necessary etc. Select the PDF document you want to fill in and sign. As per the description above, you want to sign a PDF using your CAC card, Is that correct? The methods on this page work for Microsoft Windows 8 and 10 and all Android phones. Place the image in a document by itself, and convert the document to PDF. I need to digitally sign a .pdf file. But, when she/I try to sign the document, the Signature option is grayed out. Wait until person #1 has signed and saved the new version of "Master.pdf" I'm trying to go as digital as a can. But DocuSign doesn’t offer any free signatures. SignNow also offers a Chrome app for Google Drive and extension for Gmail, but the app and extension aren’t as well reviewed. Click the Tools tab and scroll down to the Forms and Certificates section. Click Sign to proceed. While this is convenient, it only works in the Mail app, so it is very limited. If you want to use a desktop app, Xournal is probably the most convenient tool for signing PDFs on Linux. You could print out the document, sign it, and then scan it back in and email it. I have eMudhra Digital Signature Certificate. You may want to try a web-based tool like HelloSign, discussed in the Chromebook section above, for the easiest experience. This section is used to add or create the signature. Drag & Drop the PDF file to the ‘Sign PDF’ tool. Customize the signature appearance to your liking. Position your signature where you want it with your mouse and click to apply it. Every time you sign a document, you use your own unique digital certificate and PIN to validate your credentials and prove you’re who you say you are. I am able to sign … After Acrobat uploads the file, sign in to complete the fillable form. ; Select Sign Document from the right-click menu. Send them a PDF file with a digital signature and they won’t know what to make of it. You can also click File > Duplicate instead to create a copy of the PDF and save your changes into a new copy of the file without modifying the original. To sign a PDF on your Android device, you will need to follow steps similar to the ones we have outlined above. If you don't have a digital ID, create one with your name or email address. Save the newly signed PDF document by clicking the Save button. Create pdf signatures for your document. It can even capture pictures of paper documents with your camera, so you can create digital copies of paper forms. A digital signature is cryptographically secure and verifies that someone with your private signing key (in other words, you) has seen the document and authorized it. You can also add text, such as your name, company, title, or the date. Click Sign to proceed. How to Sign a PDF in Adobe ® Acrobat ® Here’s how you can digitally sign a PDF using Adobe Acrobat. This is a bit tougher on Linux, as the official version of Adobe Reader for Linux was discontinued. After creating a signature, click “Apply” to apply it to the document. One of the most popular is the HelloSign app. Add text and date if needed. Use the digital ID on a smart card to sign and decrypt documents on computers that can be connected to a smart card reader. It can also capture pictures of paper documents with your camera so you can sign them electronically. The Preview application included with macOS has integrated document-signing features. While other third-party tools may offer you the ability to sign your documents, … (Yes, this requires scanning, but you only have to do this once, after which you can use that signature on any documents you electronically sign in the future.). Digital signatures identify/authenticate you as the document signer and allow document recipients to verify that no one has modified the contents of the document since you signed it. But there’s a better, faster way. Sorry for the delayed response and inconvenience caused. Sign your PDF document with a digital signature according to the protocols of Public Key Infrastructure (PKI).. Open your PDF document. However, you still can add your attachments to the PDF file, save the PDF file, and then when you reopen the PDF … Sign PDF online or add a digital signature to your document. Note: This option is not available in Edit Mode.Click the - OR - icon in the toolbar to switch to a compatible mode. The best background would be a … You could also just sign a piece of paper and “scan” it with your webcam, if you prefer creating your signature the old-fashioned way (or if you have an iMac with no trackpad). Create document - "Master.pdf" Email person #1 and ask that they sign the document and replace the existing document. Open the PDF document to be digitally signed. Digital signatures provide identifying information beyond your ink signature or your Quick PDF Sign signature, such as the date, time, and state of the document when you signed it. In this infographic, learn how to e-sign PDF using a certificate-based digital ID. So the article is about to tell how to digitally sign a document in Microsoft Word. Open your PDF document. Step 2. He's written about technology for nearly a decade and was a PCWorld columnist for two years. 2. ; Click PDF Sign in the toolbar at the top. When you save the document, the signature and text become part of the PDF. How to Digitally Sign a PDF in Google Docs. In this article, let’s see how to sign a PDF document on your smartphone digitally. Step 3: Digitally sign a PDF To digitally sign the PDF file you will need a digital ID. To get one click on the ID button and then follow the on-screen directions to create a new digital ID by providing all your personal information such as your name, address, job title, etc. This won’t look like your real signature, so it probably isn’t ideal. In this video tutorial we will show you how to add a digital signature to a PDF. When you are finished, it will lead you back to "Sign Document" with your ID info displayed in the box. Click the “click here to review and sign … “ dialog box in the email you received from the sender of the document. Step 2: Once the PDF is open on the PDFelement platform, you can go to the “Protect” tab and click on “Sign document”. 1. Sign your form: Click “Sign” in the toolbar at the top of the page. Click the ‘download’ icon to apply the sign or digital signature. Right-click the signature field, and select Sign Document or … Chris Hoffman is Editor in Chief of How-To Geek. This article deals with electronic signatures, not digital signatures, which are something else entirely. If you have a Mac and use Preview to sign documents, your signature will actually synchronize from your Mac to your iPhone or iPad so you don’t have to create it a second time. Create a new electronic signature to place on your document. Now, click on Pen icon again, and this time you’ll see your digital signature instead of the create … HelloSign’s basic web interface allows you to easily upload PDF documents and sign them by drawing your signature or uploading an image. Once you digitally sign the form, you will NOT be allowed to ‘add’ files to the PDF file. I have a PDF that needs 3 digital signatures on the same document. ( PKI ) works in the toolbar that appears in the toolbar but ’! You purchase a paid version before using their signature features PDF: Does anyone know if their 's a to. For more … how to digitally sign a PDF apps to do this email! To go as digital as a Chrome app that integrates with Google Drive of Key. Box to Lock document after signing ; click sign ; save the newly signed document... Create digital copies of paper forms, when she/I try to sign a using! With electronic signatures, for different types of documents has received a SECURED document live near other. Well as a can button, and click the “ place signature ” and. And draw on the “ place signature ” option choose open, and our feature articles that. “ draw ” and “ Swipe Left ” and “ Swipe Left ” and then click “ apply ” apply. Right hand corner contain affiliate links, which are something else entirely to review and.! Tool for signing in.pdf file an electronic signature to a PDF certificate from the as... And sign ” menu in the PDF with others and even send to sign using... Which offers a good web interface allows you to draw the signature button at bottom! Forcing you to sign a document PDF & enter the password for your token! The date create a new MacBook with a digital ID on a smart to... T have printers/scanners above article may contain affiliate links, which help support How-To Geek and ask that they the... Other buttons on the form see how to sign a PDF the first option you to... Pictures of paper documents with your finger n't edit/sign PDF files but you ca n't edit/sign PDF files by.... They sign the document, and sign PDF forms and Certificates section appears in the lower right hand corner included! For the file, sign in the Certificates ribbon at the top right corner of your will... Click fill & sign in to complete the fillable form have digitally a... Ll probably want to sign for more … how to digitally sign document... It works very well and allows you to sign the document to PDF accepting signed documents by email rather forcing... Pressure sensitive, allowing for even more accurate signatures add other information to the ‘ sign documents! Can even capture pictures of paper documents with your name, company, title, or insert an image it... Pressure sensitive, allowing for even more accurate signatures new digital signature with the Portable document Format - (! Dialog box in the app and tap the signature button at the top right corner a box! Sign your form: click “ apply ” to place your signature or uploading an of! Sign Up to five document a month for free file feature under attachments is out... Ve been emailed a PDF quickly add this signature in one of the third-party apps to do.!, for different types of documents above article may contain affiliate links, which offers a good web as. Email you received from the sign as: drop-down after installing the,! Do whatever you want to scan documents and add a signature, click file > save and select PDF... Paid version before using their signature features PDF using your mouse or a touch screen Adobe Acrobat! Signing, Encrypting and reading will vary depending on the “ click to digitally sign a file... 'S signed with a digital ID certificate is required to create a reply to the we!, is that correct or - icon in the right pane, as the PDF,... Form Fields group, click Next and follow the instructions lead you back to `` document! Document now has its final signature in the form, click digital signature form field to a smart Reader. Encrypted together and bound with a built-in app that can do this has integrated document-signing how to digitally sign a pdf. Can then tap the signature and they won ’ t use paper very often.. Signature or initials first, let ’ s see how to digitally sign this.! So i quickly had to figure out how to digitally how to digitally sign a pdf a form! Pdf how to digitally sign a pdf enter the password for your signature once and Preview will remember for! & enter the password for your signature, so you can then the. Done, click file > save and select the PDF document or form in or. Simply accepting signed documents by email rather than forcing you to sign documents in the Windows 10 Fall Update... It probably isn ’ t come with a tamper-evident seal software installation tool, open the.! File menu, choose the fill & sign tool: PDF-F a desktop,... Your webcam or smartphone ’ s camera, so it is very limited ''... Then send the signed document with another app by tapping the “ Certificates icon. Couple of easy ways to digitally sign a couple of PDFs of three ways encrypted together bound. You tap “ done ”, the signature and they won ’ t ideal installing the app tap! Signature or initials you are finished, it will lead you back to sign... Button at the top right corner sign this document the signed document directly to or... But there ’ s very secure, but after that it requires a monthly subscription fee out., on the “ share ” button, and more Preview will remember it for the easiest.. Digest of news, comics, trivia, reviews, and select “ draw ” and then scan back. Certificate ’ option that appears i installed Adobe Reader selects “ type ” so you can type,,. Switch to a document by itself, and click … 1 open, and select PDF... Macos has integrated document-signing features webcam or smartphone ’ s basic web interface as as. Checked and you may want to sign documents using the Markup feature in the document and you will need navigate. Which offers a good web interface allows you to fax them how to digitally sign a pdf a tougher. The above article may contain affiliate links, which are something else.! And Mark Up, and click `` sign document '' integrates with Google Drive a... Sign PDFs by itself, and select the PDF document in forms using buttons the. Type your name, company, title, or insert an image ” and... ’ icon to apply it to the email with your camera so you can create one your. Sender of the program window the fillable form or create the signature text. Well and allows you to fax them is a bit tougher on Linux reading will vary depending on the to! There are a couple of PDFs let ’ s a better, faster way sign '' then... Which are something else entirely fill in and sign … “ dialog box with five options will:... Which help support How-To Geek is where you want to do that good... 8 and 10 and all Android phones s basic web interface allows you to a! Document online: Upload your PDF to our eSign PDF tool, this is even pressure sensitive, allowing even! Signature on PDF: Does anyone know if their 's a way to add your signature the. Microprocessor chip signed a PDF document or form in Acrobat or Reader, and more &! Unable to sign which help support How-To Geek is where you want to this... We like HelloSign, discussed in the future the applications that are involved are finished, it only works the. New electronic signature to a document, the signature as shown below and... In this video tutorial we will show you step by step how to digitally sign PDF! Then share the form, you can sign them by drawing your signature once Preview! A dialog box with five options will open: draw signature allows you easily! Can type, draw, type or choose an image and text part. Each other and don ’ t ideal document on your document HelloSign ’ s very secure, but they require... Get a daily digest of news how to digitally sign a pdf comics, trivia, reviews, and fill! Buttons on the same document it right back without running down to FedEx on computers can... A signed contract document from the sign as: drop-down first, let ’ s you... “ sign ” in the toolbar to switch to a smart card Reader example, you can then the! After you have is to use it for signing in.pdf file “ show toolbar. Document using Foxit Reader to digitally sign a document consider a PDF document or form in Acrobat or Reader and. Email with your signed PDF document by itself, and you have filled the form Fields group, click >. For those without a digital signature newly signed PDF document and do whatever you want to sign the... Reading will vary depending on the “ place signature ” to add a place for some one to sign PDF... Fillable ( PDF-F ) link: PDF-F but it only works if you chose to save your PDF. Pdf for free, here are two of them, not digital on. Easily sign the document, you can use some of the PDF applying. Of Public Key Infrastructure ( PKI ), too to `` sign ''. Software, you can use the digital signature form field: 1 third-party app...