diff --git a/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java b/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
index c4e5fe11..1ead1a97 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/security/CertSignController.java
@@ -81,6 +81,7 @@ public class CertSignController {
         MultipartFile privateKeyFile = request.getPrivateKeyFile();
         MultipartFile certFile = request.getCertFile();
         MultipartFile p12File = request.getP12File();
+        MultipartFile jksfile = request.getJksFile();
         String password = request.getPassword();
         Boolean showSignature = request.isShowSignature();
         String reason = request.getReason();
@@ -95,10 +96,6 @@ public class CertSignController {
         KeyStore ks = null;
 
         switch (certType) {
-            case "PKCS12":
-                ks = KeyStore.getInstance("PKCS12");
-                ks.load(p12File.getInputStream(), password.toCharArray());
-                break;
             case "PEM":
                 ks = KeyStore.getInstance("JKS");
                 ks.load(null);
@@ -107,6 +104,14 @@ public class CertSignController {
                 ks.setKeyEntry(
                         "alias", privateKey, password.toCharArray(), new Certificate[] {cert});
                 break;
+            case "PKCS12":
+                ks = KeyStore.getInstance("PKCS12");
+                ks.load(p12File.getInputStream(), password.toCharArray());
+                break;
+            case "JKS":
+                ks = KeyStore.getInstance("JKS");
+                ks.load(jksfile.getInputStream(), password.toCharArray());
+                break;
             default:
                 throw new IllegalArgumentException("Invalid cert type: " + certType);
         }
diff --git a/src/main/java/stirling/software/SPDF/model/api/security/SignPDFWithCertRequest.java b/src/main/java/stirling/software/SPDF/model/api/security/SignPDFWithCertRequest.java
index a1fc2fce..d3399db9 100644
--- a/src/main/java/stirling/software/SPDF/model/api/security/SignPDFWithCertRequest.java
+++ b/src/main/java/stirling/software/SPDF/model/api/security/SignPDFWithCertRequest.java
@@ -14,7 +14,7 @@ public class SignPDFWithCertRequest extends PDFFile {
 
     @Schema(
             description = "The type of the digital certificate",
-            allowableValues = {"PKCS12", "PEM"})
+            allowableValues = {"PEM", "PKCS12", "JKS"})
     private String certType;
 
     @Schema(
@@ -28,6 +28,9 @@ public class SignPDFWithCertRequest extends PDFFile {
     @Schema(description = "The PKCS12 keystore file (required for PKCS12 type certificates)")
     private MultipartFile p12File;
 
+    @Schema(description = "The JKS keystore file (Java Key Store)")
+    private MultipartFile jksFile;
+
     @Schema(description = "The password for the keystore or the private key")
     private String password;
 
diff --git a/src/main/resources/messages_en_US.properties b/src/main/resources/messages_en_US.properties
index 9b7efd3a..0c6572da 100644
--- a/src/main/resources/messages_en_US.properties
+++ b/src/main/resources/messages_en_US.properties
@@ -546,9 +546,11 @@ scalePages.submit=Submit
 certSign.title=Certificate Signing
 certSign.header=Sign a PDF with your certificate (Work in progress)
 certSign.selectPDF=Select a PDF File for Signing:
+certSign.jksNote=Note: If your certificate type is not listed below, please convert it to a Java Keystore (.jks) file using the keytool command line tool. Then, choose the .jks file option below.
 certSign.selectKey=Select Your Private Key File (PKCS#8 format, could be .pem or .der):
 certSign.selectCert=Select Your Certificate File (X.509 format, could be .pem or .der):
 certSign.selectP12=Select Your PKCS#12 Keystore File (.p12 or .pfx) (Optional, If provided, it should contain your private key and certificate):
+certSign.selectJKS=Select Your Java Keystore File (.jks or .keystore):
 certSign.certType=Certificate Type
 certSign.password=Enter Your Keystore or Private Key Password (If Any):
 certSign.showSig=Show Signature
diff --git a/src/main/resources/templates/security/cert-sign.html b/src/main/resources/templates/security/cert-sign.html
index fbbf36d1..20148355 100644
--- a/src/main/resources/templates/security/cert-sign.html
+++ b/src/main/resources/templates/security/cert-sign.html
@@ -1,135 +1,113 @@
 <!DOCTYPE html>
-<html th:lang="${#locale.toString()}"
-	th:lang-direction="#{language.direction}"
-	xmlns:th="http://www.thymeleaf.org">
-
-<th:block
-	th:insert="~{fragments/common :: head(title=#{certSign.title}, header=#{certSign.header})}"></th:block>
+<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
+<th:block th:insert="~{fragments/common :: head(title=#{certSign.title}, header=#{certSign.header})}"></th:block>
 
 <body>
-	<div id="page-container">
-		<div id="content-wrap">
-			<div th:insert="~{fragments/navbar.html :: navbar}"></div>
-			<br> <br>
-			<div class="container">
-				<div class="row justify-content-center">
-					<div class="col-md-6">
-						<h2 th:text="#{certSign.header}"></h2>
-
-						<form action="api/v1/security/cert-sign" method="post"
-							enctype="multipart/form-data">
-							<div class="mb-3">
-								<label th:text="#{certSign.selectPDF}"></label>
-								<div
-									th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
-							</div>
-							<div class="mb-3">
-								<label for="certType" th:text="#{certSign.certType}"></label> <select
-									class="form-control" id="certType" name="certType">
-									<option value="" th:text="#{selectFillter}"></option>
-									<option value="PKCS12">PKCS12</option>
-									<option value="PEM">PEM</option>
-								</select>
+    <div id="page-container">
+        <div id="content-wrap">
+            <div th:insert="~{fragments/navbar.html :: navbar}"></div>
+            <br> <br>
+            <div class="container">
+                <div class="row justify-content-center">
+                    <div class="col-md-6">
+                        <h2 th:text="#{certSign.header}"></h2>
+                        <form action="api/v1/security/cert-sign" method="post" enctype="multipart/form-data">
+                            <div class="mb-3">
+                                <label th:text="#{certSign.selectPDF}"></label>
+                                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
+                            </div>
+                            <!-- Tell users to use keytool to generate JKS for other formats -->
+                            <div class="mb-3">
+								<label th:text="#{certSign.jksNote}"></label>
 							</div>
+                            <div class="mb-3">
+                                <label for="certType" th:text="#{certSign.certType}"></label> <select class="form-control" id="certType" name="certType">
+                                    <option value="" th:text="#{selectFillter}"></option>
+                                    <option value="PEM">PEM</option>
+                                    <option value="PKCS12">PKCS12</option>
+                                    <option value="JKS">JKS</option>
+                                </select>
+                            </div>
+                            <div id="pemGroup" style="display: none;">
+                                <div class="mb-3">
+                                    <label th:text="#{certSign.selectKey}"></label>
+                                    <div th:replace="~{fragments/common :: fileSelector(name='privateKeyFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
+                                </div>
+                                <div class="mb-3">
+                                    <label th:text="#{certSign.selectCert}"></label>
+                                    <div th:replace="~{fragments/common :: fileSelector(name='certFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
+                                </div>
+                            </div>
+                            <div class="mb-3" id="p12Group" style="display: none;">
+                                <label th:text="#{certSign.selectP12}"></label>
+                                <div th:replace="~{fragments/common :: fileSelector(name='p12File', notRequired=true, multiple=false, accept='.p12,.pfx')}"></div>
+                            </div>
+                            <div class="mb-3" id="jksGroup" style="display: none;">
+                                <label th:text="#{certSign.selectJKS}"></label>
+                                <div th:replace="~{fragments/common :: fileSelector(name='jksFile', notRequired=true, multiple=false, accept='.jks,.keystore')}"></div>
+                            </div>
+                            <div class="mb-3">
+                                <label th:text="#{certSign.password}"></label> <input type="password" class="form-control" id="password" name="password">
+                            </div>
+                            <div class="mb-3">
+                                <label><input type="checkbox" id="showSignature" name="showSignature" th:text="#{certSign.showSig}"></label>
+                            </div>
+                            <div id="signatureDetails" style="display: none;">
+                                <div class="mb-3">
+                                    <label for="reason" th:text="#{certSign.reason}"></label> <input type="text" class="form-control" id="reason" name="reason">
+                                </div>
+                                <div class="mb-3">
+                                    <label for="location" th:text="#{certSign.location}"></label> <input type="text" class="form-control" id="location" name="location">
+                                </div>
+                                <div class="mb-3">
+                                    <label for="name" th:text="#{certSign.name}"></label> <input type="text" class="form-control" id="name" name="name">
+                                </div>
+                                <div class="mb-3">
+                                    <label for="pageNumber" th:text="#{pageNum}"></label> <input type="number" class="form-control" id="pageNumber" name="pageNumber" min="1" disabled>
+                                </div>
+                            </div>
+                            <div class="mb-3 text-center">
+                                <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{certSign.submit}"></button>
+                            </div>
+                        </form>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div th:insert="~{fragments/footer.html :: footer}"></div>
+    </div>
+    <script type="text/javascript">
+    document
+    	.getElementById('certType')
+        .addEventListener(
+            'change',
+            function() {
+                var pemGroup = document.getElementById('pemGroup');
+                var p12Group = document.getElementById('p12Group');
+                var jksGroup = document.getElementById('jksGroup');
+                var valueToGroupMap = {
+                    'PEM': pemGroup,
+                    'PKCS12': p12Group,
+                    'JKS': jksGroup
+                };
+                for (var key in valueToGroupMap) {
+                    valueToGroupMap[key].style.display = (this.value === key) ? 'block' : 'none';
+                }
+            });
 
-							<div class="mb-3" id="p12Group" style="display: none;">
-								<label th:text="#{certSign.selectP12}"></label>
-								<div
-									th:replace="~{fragments/common :: fileSelector(name='p12File', notRequired=true, multiple=false, accept='.p12,.pfx')}"></div>
-							</div>
-
-							<div id="pemGroup" style="display: none;">
-								<div class="mb-3">
-									<label th:text="#{certSign.selectKey}"></label>
-									<div
-										th:replace="~{fragments/common :: fileSelector(name='privateKeyFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
-								</div>
-								<div class="mb-3">
-									<label th:text="#{certSign.selectCert}"></label>
-									<div
-										th:replace="~{fragments/common :: fileSelector(name='certFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
-								</div>
-							</div>
-
-							<div class="mb-3">
-								<label th:text="#{certSign.password}"></label> <input
-									type="password" class="form-control" id="password"
-									name="password">
-							</div>
-                            
-							<div class="mb-3">
-								<label><input type="checkbox" id="showSignature"
-									name="showSignature" th:text="#{certSign.showSig}"></label>
-							</div>
-
-							<div id="signatureDetails" style="display: none;">
-								<div class="mb-3">
-									<label for="reason" th:text="#{certSign.reason}"></label> <input type="text"
-										class="form-control" id="reason" name="reason">
-								</div>
-								<div class="mb-3">
-									<label for="location" th:text="#{certSign.location}"></label> <input type="text"
-										class="form-control" id="location" name="location">
-								</div>
-								<div class="mb-3">
-									<label for="name" th:text="#{certSign.name}"></label> <input type="text"
-										class="form-control" id="name" name="name">
-								</div>
-								<div class="mb-3">
-									<label for="pageNumber" th:text="#{pageNum}"></label> <input
-										type="number" class="form-control" id="pageNumber"
-										name="pageNumber" min="1">
-								</div>
-							</div>
-
-							<script type="text/javascript">
-								document
-										.getElementById('certType')
-										.addEventListener(
-												'change',
-												function() {
-													var p12Group = document
-															.getElementById('p12Group');
-													var pemGroup = document
-															.getElementById('pemGroup');
-													if (this.value === 'PKCS12') {
-														p12Group.style.display = 'block';
-														pemGroup.style.display = 'none';
-													} else if (this.value === 'PEM') {
-														p12Group.style.display = 'none';
-														pemGroup.style.display = 'block';
-													} else {
-														p12Group.style.display = 'none';
-														pemGroup.style.display = 'none';
-													}
-												});
-
-								document
-										.getElementById('showSignature')
-										.addEventListener(
-												'change',
-												function() {
-													var signatureDetails = document
-															.getElementById('signatureDetails');
-													if (this.checked) {
-														signatureDetails.style.display = 'block';
-													} else {
-														signatureDetails.style.display = 'none';
-													}
-												});
-							</script>
-
-
-							<div class="mb-3 text-center">
-								<button type="submit" id="submitBtn" class="btn btn-primary"
-									th:text="#{certSign.submit}"></button>
-							</div>
-						</form>
-					</div>
-				</div>
-			</div>
-		</div>
-		<div th:insert="~{fragments/footer.html :: footer}"></div>
-	</div>
+    document
+        .getElementById('showSignature')
+        .addEventListener(
+            'change',
+            function() {
+                var signatureDetails = document.getElementById('signatureDetails');
+                if (this.checked) {
+                    signatureDetails.style.display = 'block';
+                } else {
+                    signatureDetails.style.display = 'none';
+                }
+            });
+    </script>
 </body>
+
 </html>